Tag Archive for: Silicone integrated adhesive

What is the reason for the foaming of nylon bags that do not stick to silicone? How to solve it?

The problem of non stick and foaming of nylon wrapped silicone is a common challenge in the manufacturing industry, especially in the field of composite material processing. This phenomenon often stems from a combination of factors such as material properties, processing techniques, environmental control, and operational standards.

1、 Cause analysis

1. Material characteristics

Nylon, as a thermoplastic material, has unique physical and chemical properties. The amide bonds in its molecular structure endow nylon with excellent wear resistance, oil resistance, and chemical corrosion resistance, but at the same time, it also leads to poor thermal stability and is prone to thermal decomposition and gas production during processing. In addition, plasticizers, masterbatch and other additives are often added to nylon during injection molding, which may affect the bonding performance between nylon and silicone.

Silicone is a highly elastic and high-temperature resistant rubber material with low surface energy, making it difficult to form strong chemical bonds with other materials. Therefore, without special treatment, direct contact between nylon and silicone often fails to achieve the desired bonding effect.

2. Processing technology

Injection molding temperature and time: If the injection molding temperature is too high or the time is too long, it will cause the degradation of nylon material, produce gases and volatile substances, thereby forming bubbles at the interface between nylon and silicone, affecting the bonding quality.

Mold design and exhaust: Unreasonable mold design or poor exhaust can also lead to the inability to timely release gas during the injection molding process, resulting in the formation of bubbles inside the product.
Adhesive selection and use: Improper selection of adhesive type or improper coating process, such as insufficient solid content of adhesive, uneven coating, insufficient drying, etc., can all affect the bonding effect between nylon and silicone.

3. Environmental control

The humidity, temperature, and cleanliness in the production environment also have a significant impact on the adhesion between nylon and silicone. Excessive humidity can cause nylon to absorb moisture, reducing its adhesive properties; If the temperature is too high, it may accelerate the curing reaction of the adhesive, causing stress concentration inside the bonding layer, thereby triggering bubbles or peeling.

4. Operating standards

The technical level, operating habits, and understanding of the process of operators are also important factors affecting the quality of nylon and silicone bonding. Improper operation may lead to uneven glue application, incomplete mold closure, inaccurate control of baking temperature and time, and other issues.

2、 Solution

1. Optimize material selection

Choose silicone materials with good compatibility with nylon, or use specially formulated silicone glue to improve bonding strength.
Try to minimize the addition of plasticizers, masterbatch and other additives in nylon to reduce their adverse effects on bonding performance.

2. Improve processing technology

Accurately control the injection temperature and time to avoid excessive degradation of nylon material.
Optimize mold design to ensure smooth exhaust and reduce the possibility of bubble generation.
Use the appropriate type of adhesive and follow the manufacturer’s recommended coating process to ensure that the adhesive is evenly applied and fully dried.

3. Strengthen environmental control

Maintain the cleanliness of the production environment and reduce pollution from dust and impurities.
Control the humidity and temperature of the production environment to ensure that processing is carried out under suitable conditions.

4. Improve operational standards

Provide professional training to operators to improve their understanding and mastery of the process.
Develop detailed operating procedures and work instructions to ensure that every step of the operation complies with standards.
Strengthen quality inspection and control, promptly identify and correct problems.

5. Special handling measures

For nylon wrapped silicone products that have already experienced non stick or foaming, the following special treatment measures can be attempted for repair:
Use solvents such as toluene to remove oil stains from the surface of nylon and improve its surface energy.
Apply a layer of primer or tackifier to improve the adhesion between nylon and silicone.
Apply a thin layer of glue or adhesive on the surface of silicone, and then bond it with nylon.
For severe foaming issues, reprocessing or scrapping may be necessary.
In summary, the problem of non stick and foaming of nylon wrapped silicone involves multiple factors, which need to be comprehensively solved from multiple aspects such as material selection, processing technology, environmental control, and operating standards. By continuously optimizing and improving the processes and technical means of each link, the bonding quality between nylon and silicone can be significantly improved to meet the requirements of product use.

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How to adjust the product size of liquid silicone encapsulation parts?

The size adjustment of liquid silicone encapsulated parts is a critical step that involves mold design, material selection, and optimization of production processes. The following are the detailed steps and precautions for adjusting the size of liquid silicone encapsulation parts:

1. Mold design

Mold size: Firstly, ensure that the mold size meets the design requirements. The size of the mold directly affects the size of the final product.
Mold adjustment: If it is necessary to adjust the product size, it can be achieved by adjusting the size of the mold. This may involve redesigning and processing the mold.

2. Material selection

Silicone hardness: Choose the appropriate silicone hardness. Silicone with higher hardness usually has lower shrinkage rate, while silicone with lower hardness has higher shrinkage rate.
Material formula: Adjusting the formula of silicone material, such as adding fillers or changing the proportion of curing agent, can affect the shrinkage rate and flowability of the material.

3. Production process

Injection pressure: Adjust the injection pressure to ensure that the silicone material can fully fill the mold and avoid dimensional deviations caused by insufficient pressure.
Curing temperature and time: Control the curing temperature and time to ensure complete curing of the silicone material and avoid dimensional changes caused by incomplete curing.
Cooling time: Extend the cooling time appropriately to ensure that the silicone material is fully cooled in the mold and reduce shrinkage rate.

4. Dimensional measurement and adjustment

Dimensional measurement: Use high-precision measuring tools such as micrometers or coordinate measuring instruments to regularly measure the dimensions of the product to ensure compliance with design requirements.
Feedback adjustment: Based on the measurement results, adjust the mold, material formula or production process in a timely manner to ensure the stability of product dimensions.

The size adjustment of liquid silicone encapsulation parts req

5. Precautions

Accuracy control: Throughout the entire production process, maintain operational accuracy and consistency to ensure that the dimensions of each product are consistent.
Quality inspection: Regularly conduct quality inspections to ensure that product dimensions meet design requirements and have no obvious defects.
Recording and analysis: Record the process and results of each size adjustment, conduct data analysis, and identify the optimal production parameters.

6. Common problems and solutions

Size deviation: If the product size deviation is significant, check the mold, materials, and production process to identify the problem and make adjustments.
Unstable shrinkage rate: If the shrinkage rate of silicone material is unstable, check the material formula and curing conditions, and adjust if necessary.
Mold wear: If mold wear causes dimensional deviation, repair or replace the mold in a timely manner.

summary

The size adjustment of liquid silicone encapsulated parts is a complex process that involves mold design, material selection, and optimization of production processes. By using the correct operating methods and precautions, the accuracy and stability of product dimensions can be effectively improved.

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Why choose liquid silicone injection molding process for automotive parts selection?

In today’s rapidly changing automotive industry, the performance and quality of components directly affect the safety, comfort, and durability of the entire vehicle. With the continuous progress of materials science, Liquid Silicone Rubber Injection Molding (LSR) has been widely used in the field of automotive parts manufacturing due to its unique advantages.

1、 High precision and complex shape replication capability

Liquid silicone has excellent fluidity and filling properties, which can accurately replicate the complex shapes of molds and produce high-precision, high surface finish automotive parts. This characteristic makes the liquid silicone injection molding process an ideal choice for manufacturing precision components. For example, when manufacturing engine seals, shock absorber components, and electronic component housings, liquid silicone can ensure that every subtle structure is perfectly replicated, significantly improving the sealing and durability of the product. This high-precision replication capability is beyond the reach of traditional rubber injection molding processes.

2、 Excellent physical and chemical properties

Liquid silicone not only has excellent fluidity, but also excellent temperature resistance, chemical resistance, and aging resistance. These properties enable liquid silicone injection molded automotive parts to work stably in high temperature, high pressure, and harsh environments, meeting the stringent requirements of the automotive industry. For example, in high-temperature areas such as engine compartments, seals and pipelines made of liquid silicone can maintain stable performance, prevent aging and deformation, thereby extending service life and reducing maintenance costs. In addition, the chemical resistance of liquid silicone also ensures that it will not be corroded when in contact with chemicals such as fuel and lubricants, ensuring the safety and reliability of the entire vehicle.

Liquid silicone injection molding process

3、 Environmental protection and cost-effectiveness

Liquid silicone is an environmentally friendly material that does not produce harmful substances during the production process, meeting the requirements of modern industry for green production. Meanwhile, the liquid silicone injection molding process has a high material utilization rate, which can effectively reduce raw material waste and lower production costs. In addition, this process has a high degree of automation and fast production efficiency, which can significantly shorten the production cycle and improve production efficiency. These advantages make the liquid silicone injection molding process more competitive in the manufacturing of automotive parts and help companies achieve sustainable development.

4、 Widely applicable fields

The liquid silicone injection molding process is not only suitable for manufacturing precision engine components and seals, but also widely used in the manufacturing of components in multiple key fields such as brake systems, suspension systems, electronic control systems, etc. These components are subjected to enormous pressure and wear during the operation of the car, therefore, there are extremely high requirements for the durability and sealing of their materials. The liquid silicone injection molding process can ensure that these components maintain stable performance under harsh working conditions, thereby improving the overall performance and safety of the car.

5、 Solving traditional craftsmanship problems

The traditional rubber injection molding process faces many challenges in manufacturing high-precision and highly complex automotive parts, such as rapid mold wear, low molding accuracy, and multiple product defects. The liquid silicone injection molding process, with its unique advantages, effectively solves these problems. The high fluidity and low viscosity of liquid silicone enable it to easily fill the fine structure of molds, reducing mold wear; Meanwhile, its excellent curing performance ensures high quality and consistency of the product. These advantages have made the liquid silicone injection molding process a new favorite in the field of automotive parts manufacturing.

6、 Technological Innovation and Future Development

With the continuous development of the automotive industry, the performance and quality requirements for automotive components will become increasingly high. The liquid silicone injection molding process, as an advanced manufacturing technology, is constantly meeting these requirements through technological innovation. For example, by optimizing injection molding process parameters, improving mold design, and enhancing equipment accuracy, the quality and production efficiency of liquid silicone injection molded products can be further improved. In addition, with the advancement of materials science, the continuous emergence of new liquid silicone materials will also bring more possibilities for the manufacturing of automotive parts.

In summary, the reason for choosing liquid silicone injection molding technology for automotive parts is its high precision and ability to replicate complex shapes, excellent physical and chemical properties, environmental protection and cost-effectiveness, wide application areas, and ability to solve traditional process problems. With the continuous advancement of technology and the expansion of application fields, liquid silicone injection molding technology will play a more important role in the manufacturing of automotive parts, contributing to the sustainable development of the automotive industry.

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What are the processing steps for PC pack silicone?

The processing technology of PC pack silicone is a complex and sophisticated technique widely used in various fields such as electronic products, automotive components, and daily necessities. This process not only enhances the appearance and texture of the product, but also strengthens its durability and protective performance by encapsulating silicone on a PC (polycarbonate) substrate.

1、 Material selection and preparation

Material selection: Firstly, select suitable PC materials and silicone raw materials based on the product’s requirements and performance requirements. PC materials are widely used due to their excellent mechanical properties, weather resistance, and transparency; Silicone has become an ideal coating material due to its excellent elasticity, wear resistance, and chemical stability. Silicone raw materials can be selected according to demand, including different types of silicone such as ordinary silicone, gas-phase silicone, medical silicone, etc.
Ingredients: Mix silicone raw materials with vulcanizing agents, coloring agents, and other auxiliary materials evenly according to the formula ratio. This process requires strict control over the accuracy and uniformity of the ingredients to ensure smooth processing in the future.

2、 PC substrate forming

Injection molding: Processing PC material into the desired matrix shape through high-temperature and high-pressure injection molding technology. This step is the foundation of the entire process, directly related to the appearance size and internal structure of the product. During the injection molding process, it is necessary to strictly control the temperature and pressure to ensure the physical properties and dimensional accuracy of the PC substrate. Meanwhile, the design and manufacturing of molds are also crucial, as they directly affect the quality of product molding and production efficiency.

3、 Surface treatment

Surface treatment: In order to improve the adhesion between silicone and PC substrate, it is usually necessary to perform surface treatment on the PC substrate. This includes methods such as spraying adhesives and plasma treatment. Through these treatments, the roughness and adhesion of the PC substrate surface can be enhanced, allowing silicone to adhere more firmly to the PC substrate.
Secondary injection molding: After the PC substrate is formed and surface treated, it enters the stage of silicone coating. This stage usually adopts a secondary injection molding process, which involves injecting liquid silicone into the surface or specific area of the PC substrate through a specialized injection molding machine according to a predetermined design. In order to ensure that liquid silicone can adhere evenly and seamlessly to the PC substrate, high-precision molds and equipment are required, and strict control of parameters such as temperature, pressure, and flow rate during the injection molding process is necessary.

PC bag silicone processing technology

5、 Vulcanization molding

Sulfurization molding: After injecting liquid silicone gel, vulcanization molding is required. This process is carried out at a certain temperature and pressure, causing cross-linking reactions of the silicone molecular chains and forming a stable network structure. During the vulcanization process, it is necessary to strictly control the vulcanization time and temperature to ensure the curing degree and physical properties of the silicone gel.

6、 Post processing and quality inspection

Demolding and trimming: After vulcanization, remove the silicone coated PC product from the mold and trim it. This step mainly removes excess parts such as burrs and burrs on the surface of the product, making its appearance more neat and beautiful.
Quality inspection: Finished products need to undergo various tests, such as temperature resistance, moisture resistance, adhesion testing, etc., to ensure that they can maintain excellent performance in various usage environments. At the same time, it is necessary to conduct a comprehensive inspection of the appearance, size, structure, etc. of the product to ensure compliance with design requirements and quality standards.

7、 Packaging and Shipping

Packaging: After strict quality inspection, qualified products will be packaged. During the packaging process, attention should be paid to protecting the appearance and internal structure of the product to prevent damage during transportation and storage.
Shipment: Finally, the packaged products are transported to the customer’s designated location or warehouse for storage and sale. At this point, the entire process of PC pack silicone processing technology is completed.

8、 Special craftsmanship and innovation

In addition to the basic steps mentioned above, the PC pack silicone processing technology can also be specially processed and innovated according to specific needs. For example, using dual color injection molding technology to combine silicone with another plastic material to form products with multiple colors and materials; By adjusting the formula and process parameters of silicone, special functions and properties can be achieved; Utilizing advanced technologies such as 3D printing for manufacturing complex shapes and structures. These special processes and innovations provide more possibilities and application prospects for the development of PC pack silicone processing technology.

In summary, the processing technology of PC pack silicone is a complex and sophisticated technique that requires strict control of process parameters and quality requirements for each step. Through continuous technological innovation and practical accumulation, we can continuously improve the quality and performance of our products to meet the diversified needs of the market.

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What are the factors that affect liquid silicone molding?

Liquid silicone integrated molding can achieve environmental protection and sustainable development.

There are many influencing factors for liquid silicone integrated molding, from raw material quality, molding temperature, mold structure to environmental temperature, each link may have a profound impact on the final molding effect.

First of all, the composition and properties of silica gel will directly affect the effect of integrated molding. The viscosity, fluidity, curing speed, hardness and other characteristics of silica gel will affect the molding process. High-quality silica gel raw materials usually have good fluidity and toughness, which can ensure that the silicone can be successfully filled in the mold during the molding process, while maintaining good physical properties after the molding. The poor quality of silica gel raw materials may lead to bad phenomena such as fractures and bubbles in the molding process, affecting the molding quality.

Secondly, the molding temperature, humidity and other environmental conditions will also affect the liquid silicone integrated molding. Especially in the curing stage, the control of environmental conditions is crucial to the quality of the molded product. Under normal circumstances, the viscosity of silica gel will decrease with the increase of temperature, and the fluidity will increase. Therefore, it is necessary to reasonably control the molding temperature during the molding process to ensure that the silicone can fully fill the mold and avoid gaps or bubbles. At the same time, too high molding temperature may also lead to silicone aging or burning, affecting the quality of the finished product.

Liquid silicone integrated molding can achieve environmental protection and sustainable development.

In addition, the design and manufacturing quality of the mold is crucial to the liquid silicone integrated molding. The surface finish of the mold, dimensional accuracy, exhaust system design, etc., will affect the quality of the molded product. The design of the mold should take into account the fluidity and molding characteristics of the silicone to ensure that the silicone can be successfully filled to each fine part. Molds with more complex structures may require higher molding temperatures to ensure that the silicone can be filled to every corner. At the same time, the material and surface roughness of the mold will also have an impact on the molding quality.

Finally, the ambient temperature is also a factor that can not be ignored affecting the integrated molding of liquid silicone. In the winter or low temperature environment, the fluidity of silica gel may be reduced, resulting in molding difficulties or adverse phenomena. Therefore, in the production process, the molding temperature and process parameters need to be reasonably adjusted according to the change of environmental temperature to ensure stable molding quality. In addition to the above factors, liquid silicone integrated molding may also be affected by other factors, such as molding pressure, vulcanization time, etc. These factors need to be adjusted and optimized according to the specific production conditions and product requirements to ensure the best quality and performance of the final product.

To sum up, there are many influencing factors of liquid silica gel molding, and it is necessary to comprehensively consider raw material quality, molding temperature, mold structure, environmental temperature and other factors in the production process, and ensure that the final molding effect reaches the best state through reasonable process parameter adjustment and control. Liquid silicone integrated molding using liquid silicone fluidity and formability, simplify product structure, improve production efficiency. This technology can realize the sealing of complex structures, reduce assembly errors, reduce costs, achieve material diversity, environmental protection and sustainability, and is widely used in automotive, electronics, medical and other fields, with broad prospects.

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