1. The formation of raw rubber:

Raw rubber can be divided into two categories: natural rubber and synthetic rubber:

1. Natural rubber: The raw rubber material is formed by cutting the rubber tree trunk, collecting the glue that flows out, and going through the processing procedures of impurity removal, coagulation, smoking and drying.

2. Synthetic rubber: By-products produced by the petrochemical industry, raw rubber materials with different physical properties are synthesized according to different needs. Commonly used such as: SBR, NBR, EPDM, BR, IIR, CR, Q, FKM, etc. However, due to the difference in synthesis methods, the same type of rubber can be divided into several different types of raw rubber, and through the setting of the formula, any type of rubber can be changed into thousands of raw rubbers that meet the requirements of the product.

2. The preparation of rubber raw materials:

The preparation of rubber raw materials can be divided into three basic processes:

1. Plasticizing: Plasticizing is to cut the raw rubber, plasticize and homogenize the raw rubber, and help the mixing operation of the compounding agent. The effect is to improve the dispersion of medicines, prevent frictional heat during operation, and cause scorching of the rubber, thereby changing the processability of rubber parts.

2. Mixing: Mixing is to mix the compounding drugs into the finished raw rubber evenly, and the quality of the mixing directly affects the quality of the product. The drug is unevenly dispersed, the molecular structure cannot be completely cross-linked, and the rubber cannot achieve the desired physical properties.

3. Pressing out: After mixing the raw rubber, the excess air contained in the rubber compound is pressed out after pressing out, and the required thickness is completed to facilitate the molding operation in the mold.

Three, rubber molding:

The molecular structure of raw rubber is an elastomer with unsaturated long bonds. Therefore, in the molding requirements, appropriate chemical additives and external environmental factors (such as time, temperature, pressure, etc.) are required to destroy the unsaturated bonds and then rebuild The combination is a saturated bond and is assisted by vacuum to completely force out the contained air. In this way, the molded rubber can give full play to its proper characteristics. If there are any defects in the molding process (such as formula errors, insufficient time, inappropriate temperature, etc.), it can cause loss of physical properties, release of excess drugs, deformation, accelerated aging, and various serious adverse phenomena.

Fourth, the aging phenomenon of rubber:

According to the environmental conditions of the rubber parts manufacturer's finished products, over time, the phenomenon of cracking or hardening, and deterioration of rubber properties is called aging. The causes of aging include external factors and internal factors:

1. External factors: external factors include oxygen, oxide, ozone, heat, light, radiation, mechanical fatigue, lack of processing, etc.

2. Internal factors: Internal factors include rubber types, molding methods, bonding degrees, types of drugs, and factors in processing engineering.

The prevention of aging phenomenon focuses on the correct selection of rubber types and formula design, plus a rigorous production concept. Only in this way can the life span of rubber finished products be increased and their special functions can be exerted.

Five, the basic characteristics of rubber products:

1. When the rubber product is molded, the cohesive force of the elastic body cannot be eliminated after high pressure suppression. When molding and releasing, it often produces extremely unstable shrinkage (the shrinkage rate of rubber varies depending on the type of rubber. ), after a period of time, it can be gentle and stable. Therefore, at the beginning of the design of a rubber product, regardless of the formula or mold, it is necessary to carefully calculate the fit. If not, the product size is likely to be unstable, resulting in low product quality.

2. Rubber is a hot melt thermosetting elastomer, while plastic is hot melt and cold curing. Due to the different types of sulfide, the temperature range of the molding and curing of rubber is quite different, and it may even be affected by climate changes and indoor temperature and humidity. Therefore, the production conditions of rubber products need to be adjusted appropriately at any time. If not, there may be differences in product quality.

Six, rubber laminating with double-sided adhesive distinction:

General industrial double-sided adhesives can be divided into two categories: acrylic adhesive and rubber adhesive. And these two categories can be divided into two types: base material and no base material (with base material: add a layer of cotton to the glue to enhance the amount and strength of the double-sided tape itself, no base material: Pure glue to ensure the transparency of double-sided tape). Because the main body of the rubber rubber system is CR, it is used in rubber products, and it can easily react with the rubber vulcanization system to turn yellow. Therefore, lighter colored rubber products are all made of double-sided tape with a substrate in the acrylic adhesive system (the same type of double-sided tape, whether with or without substrate, is distinguished by its own gel thickness.