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Redispersible polymer viscose powder for cement blending and production technique thereof

A technology for redispersing polymers and viscose powder, which is applied in the field of modified additives for cement materials, which can solve the problems of decreased water resistance, high flexibility of polymers, and easy back-sticking into blocks, so as to ensure water resistance and bond strength , Improve redispersibility, maintain the effect of polymer properties

Inactive Publication Date: 2012-10-24
曹丽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of preparing redispersible polymer viscose powder, the main problem encountered is to make it have good redispersibility in water, and can not reduce the water resistance after the material is formed into a film. In the prior art, The redispersibility in water can be improved by adjusting the composition of the polymer, but at the same time it will lead to the problem of a decrease in water resistance after film formation, and, after being made into powder, due to the high flexibility of the polymer, it is easy to stick back into a block

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Mix 15% vinyl acetate, 25% styrene, and 40% methyl acrylate to obtain a mixed monomer;

[0017] 2) Dissolve 7% polyvinyl alcohol and 2.5% sodium hydroxide in water to make an aqueous solution, raise the temperature to 80°C, add mixed monomers and 0.5% potassium sulfate into it, continue to raise the temperature to 95°C, react for 1 hour, and obtain after cooling polymer emulsion;

[0018] 3) Dry the emulsion obtained in step 2) by spraying method, and add 10% talcum powder when spraying to obtain viscose powder.

[0019] When used, the amount of polymer viscose powder accounts for 2% of the quality of cement mortar.

Embodiment 2

[0021] 1) Mix 35% vinyl acetate, 11.9% styrene, and 30% methyl acrylate to obtain a mixed monomer;

[0022] 2) Dissolve 9% polyvinyl alcohol and 0.8% sodium hydroxide in water to make an aqueous solution, heat up to 90°C, add mixed monomer and potassium sulfate 0.3% into it, continue to heat up to 100°C, react for 1.5h, and cool Obtain polymer emulsion;

[0023] 3) Dry the emulsion obtained in step 2) by spraying method, and add 14% talcum powder when spraying to obtain viscose powder.

[0024] When used, the amount of polymer viscose powder accounts for 3% of the quality of cement mortar.

Embodiment 3

[0026] 1) Mix 25% vinyl acetate, 39.7% styrene, and 20% methyl acrylate to obtain mixed monomers;

[0027] 2) Dissolve 5% polyvinyl alcohol and 1.5% sodium hydroxide in water to make an aqueous solution, raise the temperature to 70°C, add mixed monomers and 0.8% potassium sulfate to it, continue to heat up to 90°C, react for 2 hours, and obtain after cooling polymer emulsion;

[0028] 3) Dry the emulsion obtained in step 2) by spraying, and add 8% talcum powder when spraying to obtain viscose powder.

[0029] When used, the amount of polymer viscose powder accounts for 1.5% of the mass of cement mortar.

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PUM

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Abstract

The invention belongs to a modifying additive of a cement material, particularly relates to a redispersible polymer viscose powder for cement blending and a production technique thereof. The viscose powder is prepared by carrying out polymerization reaction on the following raw materials in percentage by weight: 10-35% of vinyl acetate, 10-40% of styrene, 20-50% of methyl acrylate, 0.5-3% of sodium hydroxide, 5-10% of polyvinyl alcohol, 0.2-1% of potassium sulfate and 8-15% of talcum powder. The viscose powder provided by the invention enhances the redispersibility after adding water, can ensure the water resistance and adhesive strength after film formation, and still has the properties of the originally synthesized polymer.

Description

technical field [0001] The invention belongs to a modified additive for cement materials, and in particular relates to a redispersible polymer viscose powder for mixing with cement and a production process. Background technique [0002] The application of polymer latex to cement materials not only significantly improves the flexural strength of cement materials, but also significantly improves the fluidity and post-hardening properties of freshly mixed cement materials due to the plasticization and air-entraining effects of emulsifiers in polymer latex. The freeze-thaw resistance of cement materials, polymer latex forms a network structure with cement hydrate after film formation, inhibits the pore structure of cement materials, and significantly reduces the permeability and air permeability of cement materials. [0003] Redispersible polymer powder refers to the polymer latex obtained by emulsion polymerization, the polymer powder obtained by drying or other means, when mix...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08L29/04C08L33/08C08L31/04C08K3/34C08F261/04C08F218/08C08F212/08C08F220/14
Inventor 曹丽
Owner 曹丽
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