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Preparation method of chloroprene and methyl methacrylate copolymer

A technology of methyl methacrylate and chloroprene, which is applied in the field of preparation of chloroprene and methyl methacrylate copolymers, and can solve problems such as difficult polymerization of monomers

Pending Publication Date: 2022-01-28
SHANNA SYNTHETIC RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that two monomers of chloroprene and methyl methacrylate (MMA) are difficult to polymerize, the present invention provides a preparation method of a copolymer of chloroprene and methyl methacrylate. Introduce MMA into polychloroprene macromolecules during ethylene emulsion polymerization to achieve the purpose of modification with the second monomer

Method used

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  • Preparation method of chloroprene and methyl methacrylate copolymer
  • Preparation method of chloroprene and methyl methacrylate copolymer
  • Preparation method of chloroprene and methyl methacrylate copolymer

Examples

Experimental program
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Embodiment 1

[0020] Example 1: A copolymer of chloroprene and methyl methacrylate, wherein the oil phase: 380g of chloroprene, 56g of MMA, 0.4g of DDM; the water phase: 587g of water, 2.2g of sodium hydroxide, 16g of H95 , 1.6g of anhydrous sodium sulfite, 15g of sodium soap.

[0021] The oil phase and the water phase are prepared according to the formula. After the oil phase and the water phase are completely dissolved, emulsify and emulsify at 25-28°C for 25-30 minutes. After emulsification, add 2.5ml of diethanolamine DEA solution, within 10-30 minutes Heat to 35-38°C, then continuously add 3.5% aqueous initiator potassium persulfate solution. After adding the initiator, at the beginning of the initiation reaction, the temperature of the jacket is lowered to control the reaction temperature at 39-41°C, and the specific gravity reaches d 4 40 After -1.035, heat up to 45-48°C and continue to react until the specific gravity is d 4 50 —1.060; then heat up to 70-80°C, add 16% Na 2 SO ...

Embodiment 2

[0026] Example 2: A copolymer of chloroprene and methyl methacrylate, wherein, the oil phase: 380g of chloroprene, 106g of MMA, 0.55g of DDM; the water phase: 587g of water, 2.2g of sodium hydroxide, 18g of H95 , 1.6g of anhydrous sodium sulfite, 15g of sodium soap.

[0027] Operation method is the same as embodiment 1. Take a certain quality of emulsion, add enough methanol, precipitate solids and air-dry them at room temperature for 24 hours; vacuum-dry them at 70°C until constant, and convert to get the total solids.

[0028] The obtained precipitate contains MMA homopolymer, non-copolymerized chloroprene rubber (CR) and a copolymer of chloroprene and MMA. Dry the precipitate and take a dry sample (W 0 ) is cut into tiny shapes and placed in the filter cloth of the Soxhlet extractor, heated to boiling with acetone, repeatedly extracting the MMA homopolymer in the sediment by reflux, continuous extraction for 72h, and taking out the separated solid in the filter cloth, Fi...

Embodiment 3

[0029]Example 3: A copolymer of chloroprene and methyl methacrylate, wherein the oil phase: 380g of chloroprene, 156g of MMA, 0.7g of DDM; the water phase: 587g of water, 2.2g of sodium hydroxide, 20g of H95 , 1.6g of anhydrous sodium sulfite, 15g of sodium soap.

[0030] Operation method is the same as embodiment 1. Take a certain quality of emulsion, add enough methanol, precipitate solids and air-dry them at room temperature for 24 hours; vacuum-dry them at 70°C until constant, and convert to get the total solids.

[0031] The obtained precipitate contains MMA homopolymer, non-copolymerized chloroprene rubber (CR) and a copolymer of chloroprene and MMA. Dry the precipitate and take a dry sample (W 0 ) is cut into tiny shapes and placed in the filter cloth of the Soxhlet extractor, heated to boiling with acetone, repeatedly extracting the MMA homopolymer in the sediment by reflux, continuous extraction for 72h, and taking out the separated solid in the filter cloth, First...

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Abstract

The invention belongs to the technical field of chloroprene rubber preparation, provides a preparation method of a chloroprene and methyl methacrylate copolymer, and aims to solve the problem that two monomers of chloroprene and methyl methacrylate (MMA) are difficult to polymerize, wherein MMA is introduced into polychloroprene in a chloroprene emulsion polymerization process, so that the purpose of modification by using a second monomer is achieved. According to the method, a chloroprene monomer and MMA are copolymerized, the MMA is introduced into polychloroprene macromolecules in a polymerization reaction stage, the chloroprene monomer is partially homopolymerized at low temperature to form a structure based on polychloroprene, then the system is heated to 70-80 DEG C, and an oil-soluble initiator is added, so that the MMA is initiated to react, and finally a product modified by the MMA is obtained. According to the invention, the obtained product takes a chloroprene polymer macromolecular structure as a main body, and an MMA polymer is introduced, so that the product has higher affinity when being in contact with cotton, leather, PVC (Polyvinyl Chloride) and the like so as to obtain better adhesive property.

Description

technical field [0001] The invention belongs to the technical field of chloroprene rubber preparation, in particular to a preparation method of chloroprene and methyl methacrylate copolymer. Background technique [0002] In order to improve the bonding performance of chloroprene rubber, or improve its comprehensive performance, it is usually necessary to use polychloroprene and methyl methacrylate for grafting reaction to prepare grafted neoprene rubber. During the grafting reaction, it is necessary to use A large amount of toluene also consumes a large amount of energy, which greatly increases the product cost. And in this process, the toluene used as a solvent will volatilize into the surrounding environment accidentally, which will endanger the health of the staff and bring great pollution to the environment. This problem limits its future development. [0003] The properties and activities of chloroprene and methyl methacrylate (MMA) monomers are quite different. Genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/18C08F220/14C08F2/00C08F2/26
CPCC08F236/18C08F2/001C08F2/26C08F220/14
Inventor 毛利军武东宇贾佳刘日齐中华
Owner SHANNA SYNTHETIC RUBBER
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