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Method for preparing EVA elastomer microemulsion

A technology of microemulsion and elastomer, which is applied in the field of EVA elastomer microemulsion prepared by pre-emulsification seed method, can solve the problems of difficult process control and complex formula, and achieve the effect of large quantity, good stability and small particle size

Active Publication Date: 2018-03-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the preparation of EVA elastomer nanoparticle microemulsion, due to its complex formula and high difficulty in process control, there are few reports at present.

Method used

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  • Method for preparing EVA elastomer microemulsion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Ammonium persulfate is used as the initiator, the total amount is 0.01wt% of vinyl acetate, the initiator is added before the monomer, O / W system, the amount of surfactant op-10 is 15.0wt% of the amount of monomer VAc, colloid The dosage of protective agent PVA is 2.5wt% of that of monomer VAc, the dosage of pH regulator is 0.5wt% of that of monomer VAc, the polymerization reaction temperature is 75°C, the ethylene reaction pressure is 7.5MPa, and the polymerization reaction time is 5h. Under this condition, the VAc content of the polymerization product is 62.6wt%, and the average particle size of the microemulsion is 129nm. The stability of the emulsion is good, and the emulsion can be stored stably for 7 months.

Embodiment 2

[0036] Ammonium persulfate is used as the initiator, the total amount is 0.5wt% of vinyl acetate, the initiator is added before the monomer, O / W system, the amount of surfactant op-10 is 15.0wt% of the amount of monomer VAc, colloid The dosage of protective agent PVA is 2.5wt% of that of monomer VAc, the dosage of pH regulator is 0.5wt% of that of monomer VAc, the polymerization reaction temperature is 75°C, the ethylene reaction pressure is 7.5MPa, and the polymerization reaction time is 5h. Under this condition, the VAc content of the polymerization product is 62.5wt%, and the average particle size of the microemulsion is 121nm. The stability of the emulsion is good, and the emulsion can be stored stably for 7 months.

Embodiment 3

[0038] Ammonium persulfate is used as the initiator, the total amount is 1.0wt% of vinyl acetate, the initiator is added before the monomer, O / W system, the amount of surfactant op-10 is 15.0wt% of the amount of monomer VAc, colloid The dosage of protective agent PVA is 2.5wt% of that of monomer VAc, the dosage of pH regulator is 0.5wt% of that of monomer VAc, the polymerization reaction temperature is 75°C, the ethylene reaction pressure is 7.5MPa, and the polymerization reaction time is 5h. Under this condition, the VAc content of the polymerization product is 62.6wt%, and the average particle size of the microemulsion is 110nm. The stability of the emulsion is good, and the emulsion can be stored stably for 8 months.

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Abstract

The invention relates to a method for preparing an EVA elastomer microemulsion. The method comprises the following steps: S1, adding a first part of an emulsifier into deionized water so as to form amicelle, and adding vinyl acetate so as to obtain a pre-emulsified monomer solution; S2, adding a second part of the emulsifier into deionized water so as to form a micelle, adding a water-soluble free-radical initiator, carrying out mixing, then heating an obtained mixed solution, and allowing the water-soluble free-radical initiator to decompose and form free radicals so as to obtain a solution;and S3, adding the pre-emulsified monomer solution obtained in the step S1 into the solution obtained in the step S2, introducing ethylene, and carrying out a copolymerization reaction so as to obtain the EVA elastomer microemulsion. By adoption of the method provided by the invention, the particle size of emulsion particles can be significantly reduced; the shape of particles is maintained; andthe stability of an emulsion is greatly improved.

Description

technical field [0001] The invention relates to the field of EVA elastomers, in particular to a method for preparing EVA elastomer microemulsions by using a pre-emulsified seed method. Background technique [0002] The EVA (ethylene / vinyl acetate copolymer) elastomer emulsion produced by emulsion polymerization has moderate vinyl acetate (VAc) content, and the product has excellent flexibility, transparency, low temperature flexibility, weather resistance, and chemical corrosion resistance compatibility with fillers and color masterbatches; EVA emulsion products have high strength, non-toxic environmental protection, and excellent bonding performance, and can be used in textiles, light industry, coatings, plastic toughening, construction preparations, and polymer blending Coating, rubber modification and other fields are widely used, and its domestic and foreign demand continues to increase, and it has developed rapidly in recent years. [0003] Patent CN1302027C initiates ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F210/02C08F2/01C08F2/30
CPCC08F2/01C08F2/30C08F218/08C08F210/02
Inventor 陈博刘小萌于鲁强刘金伟
Owner CHINA PETROLEUM & CHEM CORP