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Redispersable latex powder emulsion, redispersable latex powder and preparation method thereof

A technology for redispersing latex powder and emulsion, which is applied in the field of redispersible latex powder emulsion and redispersible latex powder, which can solve the problems of poor adhesion and achieve excellent adhesion

Active Publication Date: 2008-04-30
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The redispersible latex powder prepared by this method has better stability, but poor adhesion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Preparation of modified polyvinyl alcohol A:

[0029] Mix 40g polyvinyl alcohol (molecular weight: 500g / mol, degree of alcoholysis: 83 mol%), 100g deionized water, and 60g vinyltrioxysilane, heat up to 80°C for 5 hours, drop to 25°C, and discharge ,spare.

[0030] 2) Synthesis of redispersible latex powder emulsion:

[0031] a) Mix 98g of vinyl acetate and 2g of ethyl mercaptoacetate to make a mixed monomer for subsequent use.

[0032] b) 80 g of mixed monomers were added to an aqueous solution of 2 g of allyl polyoxyethylene ether sulfate, 0.2 g of potassium persulfate and 100 g of deionized water, and stirred at high speed for 30 minutes. spare.

[0033] c) Add 20 parts of mixed monomers into an aqueous solution of 20 g of modified polyvinyl alcohol A, 2 g of allyl polyoxyethylene ether sulfate and 2 g of potassium persulfate dissolved in 64.3 g of deionized water, raise the temperature to 50 ° C, and react for 0.1 hour, then drop the mixed solution in b) proce...

Embodiment 2

[0043] 1) Preparation of modified polyvinyl alcohol B:

[0044] Mix 80g of polyvinyl alcohol (molecular weight: 1000g / mol, degree of alcoholysis: 99mol%), 400g of deionized water, and 20g of vinyl methoxydiethoxyalkane, heat up to 95°C for 0.5 hours, and drop to 25°C. ℃, discharge, and set aside.

[0045] 2) Synthesis of redispersible latex powder emulsion:

[0046] a) 100g vinyl tertiary carbonate is for subsequent use.

[0047] b) Add 100 g of tertiary vinyl carbonate to an aqueous solution of 0.2 g of allyl polyoxyethylene ether sulfate, 2 g of sodium persulfate and 33.6 g of deionized water, and stir at high speed for 30 minutes. spare.

[0048] c) In an aqueous solution of 10g modified polyvinyl alcohol B, 0.1g allyl polyoxyethylene ether sulfate, 0.1g sodium persulfate and 28g deionized water, raise the temperature to 90°C, react for 1 hour, and then add b) dropwise The mixed solution in the process was kept for 2 hours, and the reaction was continued for 0.5 hours. ...

Embodiment 3

[0058] 1) Preparation of modified polyvinyl alcohol C:

[0059] Mix 60g polyvinyl alcohol (molecular weight: 10000g / mol, degree of alcoholysis: 88 mol%), 300g deionized water, and 40g vinyltriethoxysilane, heat up to 90°C for 3 hours, drop to 25°C, and Material, spare.

[0060] 2) Synthesis of redispersible latex powder emulsion:

[0061] a) Mix 50g of methyl methacrylate, 49g of n-butyl acrylate, and 1g of mercaptoethanol to make a mixed monomer, and set aside.

[0062] b) Add 90 g of mixed monomers into an aqueous solution of 1 g of allyl polyoxyethylene ether, 1 g of ammonium persulfate and 50 g of deionized water, and stir at high speed for 30 minutes. spare.

[0063] c) Add 10 g of mixed monomers into an aqueous solution of 20 g of modified polyvinyl alcohol C, 1 g of allyl polyoxyethylene ether sulfate and 1 g of ammonium persulfate dissolved in 44 g of deionized water, raise the temperature to 70° C., and react for 0.5 hours. Then drop the mixed solution in the proc...

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Abstract

The invention provides re-dispersible emulsion powder emulsion and re-dispersible emulsion powder and the preparation method thereof. The re-dispersible emulsion powder emulsion is obtained by vinyl ester, (methyl) styrene, and (methyl) acrylic ester through the emulsion polymerization way, and added polyvinyl alcohol is modified polyvinyl alcohol. The re-dispersible emulsion powder can be obtained through being dried in the way of conventional spray drying. The re-dispersible emulsion powder can widely used for the building fields of dry mix sand slurry, powder coating, etc. The re-dispersible emulsion powder of the invention adopts the modified polyvinyl alcohol as protective colloid, and compared with the ordinary re-dispersible emulsion powder, the re-dispersible emulsion powder has excellent adhesive property, and is a high performance and environmental protective product which can meet the requirements of building concrete and building mortar. The product is used in the building concrete and the mortar, and the workability and the cohesive force of the building concrete and the mortar can be obviously enhanced.

Description

technical field [0001] The invention relates to a redispersible latex powder emulsion and a redispersible latex powder. Background technique [0002] At present, the large-scale production and application of cement materials has a history of more than 100 years. It is characterized by being hard as stone, having strong compressive strength, easy to mix with water, forming hydration products, having good hydraulic hardness and good durability. And it is easy to use, but it has very low extensibility, poor permeability resistance, and is easy to shrink and crack. [0003] In order to improve the impermeability, frost resistance and heat resistance of cement materials, reduce or completely eliminate the cracking of cement materials. The addition of water-redispersible polymer powder compositions based on homopolymers or copolymers to cementitious materials is known. Such dispersible powder compositions are prepared by spray-drying the corresponding aqueous plastic dispersions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/10C08F212/08C08F2/24C08J3/12C08L33/04C08K3/36C08L29/04
Inventor 施晓旦王养臣尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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