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Emulsifying method of ethylene-vinyl acetate copolymer

A vinyl acetate and copolymer technology, which is applied in the emulsification field of ethylene-vinyl acetate copolymer, can solve the problems of demand, large particle size of EVA emulsion, low heat sealing temperature, etc., and achieves good emulsion stability and high practicality. The effect of applying meaning

Active Publication Date: 2020-12-11
内蒙古浩普科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN110452393A reports a method of water-based EVA resin dispersion, the method is to melt EVA resin and rheological grade polyamide wax under high pressure conditions, then add water and stir at high speed, and finally prepare EVA resin water-based dispersion body, the method is characterized in that the preparation process is simple, the disadvantage is the need for high pressure reaction, the highest pressure can reach 10Mpa, and the amount of rheological agent used is as high as 40-60% of the EVA resin
Patent CN108084370A has reported a kind of preparation method of low-temperature heat-sealing EVA emulsion, and it is that EVA resin, emulsifier, defoamer, amino resin etc. are directly emulsified in reactor, and this method prepares EVA emulsion heat-sealing temperature lower, However, the prepared EVA emulsion has a larger particle size

Method used

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  • Emulsifying method of ethylene-vinyl acetate copolymer
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  • Emulsifying method of ethylene-vinyl acetate copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 100g of vinyl acetate content is 28% EVA resin, 10g of cyclohexane, 10g of polyvinyl alcohol and 5g of non-ionic emulsifier op-10 placed in the reactor, 80 ℃ 50rpm rotating speed mechanical stirring Melting under action to form EVA resin in a melt state;

[0025] (2) When the temperature of the EVA resin in the molten state of the reactor is reduced to 70°C, slowly add 5 g of potassium oleate and 20 g of deionized water to the reactor, and stir at a speed of 300 rpm so that the EVA resin in the molten state and water are fully mixed. mix. During the rapid stirring at 800rpm, the viscosity of the EVA melt increases rapidly and turns into a water-in-oil state, that is, the EVA resin in the melt state is the continuous phase, and water is the dispersed phase;

[0026] (3) Continue to add 150g of deionized water in the reactor, and stir at a speed of 200rpm at the same time, the EVA resin in the melt state in the reactor will change into an oil-in-water state because o...

Embodiment 2

[0028] (1) the vinyl acetate content of 100g is 15% EVA resin, the alkyl spirit of 10g, the polyvinyl alcohol of 10g and the nonionic emulsifier Tween 80 of 5g are placed in reactor, 110 ℃ 150rpm mechanical stirring Melting under action to form EVA resin in a melt state;

[0029] (2) When the temperature of the EVA resin in the molten state of the reactor is reduced to 70° C., slowly add 10 g of disproportionated potassium abietate and 30 g of deionized water to the reactor, and stir at 200 rpm so that the EVA resin in the molten state is fully mixed with water. mix. During the rapid stirring process at 1500rpm, the viscosity of EVA melt increases rapidly and turns into a water-in-oil state, that is, the EVA resin in the melt state is the continuous phase, and water is the dispersed phase;

[0030] (3) Continue to add 140g of deionized water to the reactor, and stir rapidly at the same time. The EVA resin in the melt state in the reactor will change to an oil-in-water state d...

Embodiment 3

[0032] (1) the vinyl acetate content of 100g is the EVA resin of 33%, the alkyl solvent naphtha of 5g and 5g cyclohexane, the polyvinyl alcohol of 10g and the nonionic emulsifier castor oil polyoxyethylene ether 5g and polyoxyethylene ether of 5g 5g of ethylene glycol is placed in the reaction kettle, and melted under the action of mechanical stirring at 90°C and 200rpm to form a molten EVA resin;

[0033] (2) When the temperature of the EVA resin in the melt state of the reactor is reduced to 75°C, slowly add 10 g of potassium ricinoleate and 20 g of deionized water to the reactor, and stir at 100 rpm to make the EVA resin in the melt state and water Mix well. During the stirring process at 1800rpm, the viscosity of the EVA melt increases rapidly and turns into a water-in-oil state, that is, the EVA resin in the melt state is the continuous phase, and water is the dispersed phase;

[0034] (3) Continue to add 180g of deionized water to the reactor, and stir at 200rpm. The EV...

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Abstract

The invention discloses an emulsifying method of an ethylene-vinyl acetate copolymer, and belongs to the field of fine chemical engineering. The method comprises the following steps: dispersing moltenEVA (ethylene-vinyl acetate) resin into fine EVA particles under the dual actions of high-speed shearing action and an emulsifier, and converting EVA with a water-in-oil structure into EVA emulsion with an oil-in-water structure by an emulsion conversion method, and finally realizing the purpose of preparing the EVA water-based emulsion. The EVA emulsion prepared by the method can be used in thefield of water-based hot melt adhesives, has important application in the fields of carpets, artificial turfs and textiles, and has high practical application significance.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to an emulsification method of ethylene-vinyl acetate copolymer. Background technique [0002] Ethylene-vinyl acetate copolymer resin (EVA) is a new type of hot-melt adhesive, which can be widely used in the fields of perfect book binding, furniture edge banding, carpets and artificial turf. Generally speaking, the content of vinyl acetate in EVA resin is between 5% and 55%. Due to the introduction of vinyl acetate monomer, the crystallization performance of the resin itself decreases, thereby improving the toughness and impact resistance of the EVA resin itself. Therefore, The application field of EVA resin is increasing year by year. [0003] In recent years, with the increasingly higher requirements for environmental protection, water-based polymer products have developed rapidly. For example, the global production capacity of water-based polyurethane and water-based acryl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L23/08
CPCC08J3/03C08J2323/08
Inventor 刘伯军杨斌斌张明耀张会轩徐璐白阳吴高澄胡艺伟刘香池
Owner 内蒙古浩普科技有限公司
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