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[Chemical Knowledge]：Properties and Uses of Crosslinking Agents

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The nature and use
of cross-linking agent in the field of raw materials for chemical production
1. Introduction

In the production of chemical products, cross-linking agent is an important additive that can improve the performance and service life of materials. The crosslinking agent forms a three-dimensional network structure between polymer chains through chemical reaction, thereby increasing the hardness, strength, heat resistance, corrosion resistance and other properties of the material. In this paper, the nature and use of cross-linking agents will be discussed in detail.

2. the nature of the crosslinking agent

1. chemical reactive

crosslinking agent has a high degree of chemical reactivity, can react with functional groups in polymer materials, forming a covalent bond. This chemical reactivity is the basis for the crosslinking agent to achieve the crosslinking function.

2. thermal stability

crosslinking agent can be stable at high temperature, not easy to decompose or volatilize, so as to ensure the effective crosslinking reaction.

3. Compatibility
The
crosslinking agent needs to have good compatibility with the polymer material, can be uniformly dispersed in the material, and achieve a uniform crosslinking effect.

3. the use of crosslinking agent

1. improve the mechanical properties of the material

through the crosslinking reaction, the crosslinking agent can form a three-dimensional network structure between the polymer chains, increase the hardness, strength, toughness and other mechanical properties of the material. Therefore, in the fields of plastics, rubber, adhesives, etc., crosslinking agents are often used to improve the mechanical properties of products.

2. Improve the heat resistance and corrosion resistance of the material.

cross-linking reaction can form a stable three-dimensional network structure, thereby improving the heat resistance and corrosion resistance of the material. Therefore, in chemical products used in harsh environments such as high temperature and corrosion, crosslinking agents are often added to improve the service life of the products.

3. Improve the dimensional stability of the material

cross-linking reaction can reduce the mobility of the polymer chain, thereby improving the dimensional stability of the material. Therefore, in certain applications where dimensional stability is required, such as optical devices, electronic devices, etc., crosslinking agents are often used.

4. cross-linking agent application case

1. polyethylene cross-linked cable

in cable production, in order to improve the heat resistance, corrosion resistance and electrical insulation of the cable, often use cross-linking agent for polyethylene cross-linking treatment. Through the crosslinking reaction, a three-dimensional network structure can be formed between polyethylene molecular chains, thereby improving the service life and safety of the cable.

2.

of rubber products In the production of rubber products, crosslinking agents can increase the hardness and strength of rubber, and improve its wear resistance and crack resistance. Commonly used crosslinking agents include sulfur, peroxides, and the like.

3. Adhesive

In the production of adhesives, crosslinking agents can improve the bonding strength and heat resistance of adhesives, and improve their water resistance and weather resistance. Commonly used crosslinking agents include isocyanates, amines, and the like.

5. conclusion

In short, crosslinking agent plays an important role in the field of chemical production raw materials, which can improve the performance and service life of materials. Different types of crosslinking agents have different properties and uses, and need to be selected and used according to specific application scenarios. With the continuous progress of science and technology, the application prospect of crosslinking agent will be more broad in the future.

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