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A kind of water-resistant redispersible latex powder and preparation method thereof

A redispersible latex powder and water-resistant technology, which is applied in the field of water-resistant redispersible latex powder and its preparation, can solve the problems of improving water resistance and poor water resistance, and achieve improved water resistance and heat resistance Excellent effect of improving redispersibility

Active Publication Date: 2022-04-22
ANHUI WANWEI HUSN NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymer emulsion used in this invention is a vinyl acetate-ethylene-acrylate copolymer emulsion. The water resistance of the emulsion itself is not good, and it is necessary to add a modified additive to achieve water resistance, and the water resistance has not been improved from the polymer itself. performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the water-resistant type redispersible latex powder of the present embodiment is as follows:

[0030] Step 1. Add a small amount of water into the dissolution tank, then add polyvinyl alcohol with a polymerization degree of 500 and an alcoholysis degree of 85%; pass water vapor into the dissolution tank and stir, and the water vapor will form a vortex in the dissolution tank to make the polyvinyl alcohol The vinyl alcohol is fully dissolved; after steaming and stirring for 1 hour, an aqueous solution of polyvinyl alcohol with a solid content of 12% is obtained.

[0031] Step 2, polyvinyl alcohol aqueous solution, polyvinyl acetate-ethylene copolymer emulsion (viscosity is 1500mPa.s, solid content is 45%), tertiary acid emulsion (viscosity is 2300mPa.s, solid content is 53%) by mass ratio 1 :2.5:2.5 After mixing, stir evenly to obtain a spray liquid.

[0032] Step 3. Spray-dry the spray liquid (the inlet temperature of the drying tower is 130°C...

Embodiment 2

[0041] The preparation method of the water-resistant type redispersible latex powder of the present embodiment is as follows:

[0042] Step 1. Add a small amount of water into the dissolution tank, then add polyvinyl alcohol with a polymerization degree of 500 and an alcoholysis degree of 88%; pass water vapor into the dissolution tank and stir, and the water vapor will form a vortex in the dissolution tank to make the polyvinyl alcohol The vinyl alcohol was fully dissolved; after steaming and stirring for 1 hour, an aqueous solution of polyvinyl alcohol with a solid content of 16% was obtained.

[0043] Step 2, polyvinyl alcohol aqueous solution and polyvinyl acetate-ethylene copolymer emulsion (viscosity is 950mPa.s, solid content is 43%), tertiary acid emulsion (viscosity is 3600mPa.s, solid content is 55%) by mass ratio 1 :2.5:2.5 After mixing, stir evenly to obtain a spray liquid.

[0044] Step 3. Spray-dry the spray liquid (the inlet temperature of the drying tower is 1...

Embodiment 3

[0053] The preparation method of the water-resistant type redispersible latex powder of the present embodiment is as follows:

[0054]Step 1. Add a small amount of water into the dissolution tank, then add polyvinyl alcohol with a polymerization degree of 1700 and an alcoholysis degree of 88%; pass water vapor into the dissolution tank and stir, and the water vapor will form a vortex in the dissolution tank to make the polyvinyl alcohol The vinyl alcohol was fully dissolved; after steaming and stirring for 1.2 hours, an aqueous solution of polyvinyl alcohol with a solid content of 16% was obtained.

[0055] Step 2, polyvinyl alcohol aqueous solution, polyvinyl acetate-ethylene copolymer emulsion (viscosity is 2300mPa.s, solid content is 48%), tertiary acid emulsion (viscosity is 3400mPa.s, solid content is 60%) by mass ratio 1 :2.5:2.5 After mixing, stir evenly to obtain a spray liquid.

[0056] Step 3. Spray-dry the spray liquid (the inlet temperature of the drying tower is ...

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Abstract

The invention discloses a water-resistant redispersible latex powder and a preparation method thereof. Its raw materials include polymer emulsion, polyvinyl alcohol aqueous solution, anti-caking agent and organic silicon crosslinking agent, wherein the polymer emulsion is a tertiary carbonic acid emulsion A mixture with at least one of vinyl acetate-ethylene copolymer emulsion and styrene-acrylic emulsion. The redispersible latex powder of the present invention has excellent redispersibility, cohesiveness and water resistance, is suitable for fields requiring high water resistance for building material mortar, and has broad market prospects.

Description

technical field [0001] The invention relates to a water-resistant redispersible latex powder and a preparation method thereof [0002] technical background [0003] Redispersible latex powder is a redispersible polymer powder obtained by spray drying after adding other modified substances into the polymer emulsion, which can reform an emulsion with water as the dispersion medium. As a mortar additive, redispersible latex powder can improve the workability of mortar, increase the bonding strength of mortar, and increase the flexibility of mortar. The latex powder with special properties can also improve the aging resistance, water resistance, acid and alkali resistance of mortar, etc. . At present, among domestic latex powders, most of them are general-purpose rubber powders, and the performance of latex powders with special properties is generally poor. [0004] Patent CN2015104580316 introduces a water-resistant redispersible latex powder, which can withstand water for 4 h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L31/04C08L31/02C08L29/04C08K3/26C08K3/34C08K3/36C08J3/12
CPCC08L31/04C08L31/02C08J3/122C08J2331/04C08J2331/02C08J2429/04C08K2003/265C08L29/04C08K3/26C08K3/34C08K3/36C08J3/12
Inventor 范厚能杨军王大莲汪勇严和俊李春雏
Owner ANHUI WANWEI HUSN NEW MATERIAL
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