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Preparation process of special rubber powder for architectural coating

A preparation process and technology for architectural coatings, applied in the direction of starch derivative coatings, etc., can solve the problems of low reaction efficiency, long reaction time, and long production process, and achieve the effects of high transparency, short reaction time, and low production cost

Inactive Publication Date: 2011-11-02
JIANGXI RENFENG AGRI DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction conditions of the wet process are mild. After the reaction is completed, the product with high purity can be obtained by filtering and washing with water. However, there are disadvantages such as long production process, long reaction time, low reaction efficiency, and serious water pollution during the production process.

Method used

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  • Preparation process of special rubber powder for architectural coating
  • Preparation process of special rubber powder for architectural coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Oxidation reaction:

[0061] Put 1000kg of raw starch into the stainless steel reaction tank through the elevator, start the motor to stir, spray 10% NaOH solution into the starch through the spray system, adjust the pH to 10, after adjusting the pH, add 5Kg industrial H 2 o 2 The solution prepared with 60Kg of water is heated at the same time, the temperature is controlled at 50°C to 60°C, and the reaction is carried out at this temperature for 3 hours;

[0062] Hydrogen peroxide generates active oxygen under alkaline conditions, which can break and oxidize starch glycosidic bonds, reduce the instability of starch molecules, and introduce carbonyl and carboxyl groups on starch molecules to obtain oxidized starch.

[0063] (2), cross-linking reaction:

[0064] After the oxidation reaction is completed, adjust the pH value to 11.5 with NaOH solution, spray into a solution made of 0.04Kg epichlorohydrin and 8Kg industrial alcohol, and react for 2 hours at 50°C to 60...

Embodiment 2

[0069] (1) Oxidation reaction: Put 1000kg of raw starch into the stainless steel reaction tank through the elevator, start the motor to stir, spray 10% NaOH solution into the starch through the spray system, and adjust the pH to 8.5; adjust the pH After that, add 9Kg industrial H 2 o 2 And 60Kg water solution, turn on the oil pump to heat at the same time, control the temperature at 50℃~60℃, and react at this temperature for 2h;

[0070] (2) Cross-linking reaction: After the oxidation reaction is completed, adjust the pH value to 10 with NaOH solution, spray a solution made of 0.08Kg epichlorohydrin and 8Kg industrial alcohol, and react at 50°C to 60°C for 3 hours;

[0071] (3) Etherification reaction: After the cross-linking reaction is completed, adjust the temperature below 30°C, then put 104Kg powdered NaOH into the reaction tank, stir and mix for 30min, and then add 70Kg ClCH 2 The solution made of COOH and 60Kg industrial alcohol is sprayed into the reaction tank for r...

Embodiment 3

[0073] (1) Oxidation reaction: Put 1000kg of raw starch into the stainless steel reaction tank through the elevator, start the motor to stir, spray 10% NaOH solution into the starch through the spray system, and adjust the pH to 9; adjust the pH Finally, add 6Kg industrial H 2 o 2 And 65Kg water solution, turn on the oil pump to heat at the same time, control the temperature at 50 ℃ ~ 60 ℃, and react at this temperature for 2 hours;

[0074] (2) Crosslinking reaction: After the oxidation reaction is completed, adjust the pH value to 11 with NaOH solution, spray a solution made of 6Kg sodium trimetaphosphate and 10Kg water, and react at 50°C to 60°C for 3 hours;

[0075] (3) Etherification reaction: After the cross-linking reaction is completed, adjust the temperature below 30°C, then put 65kg of powdered NaOH into the reaction tank, stir and mix for 30min, and then add 70kg of ClCH 2 The solution made of COONa and 60kg of water was sprayed into the reaction tank for reaction...

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Abstract

The invention belongs to the field of fine chemistry, and in particular relates to a preparation process of special rubber powder for an architectural coating. A one-step dry synthesis process of oxidation, cross-linking and etherification is adopted; and the invention adopts the preferred scheme that: industrial H2O2 for oxidation is adopted in the oxidation reaction, epoxy chloropropane for cross-linking is adopted in the cross-linking reaction, and ClCH2COONa is used as an etherification agent in the etherification reaction. By multiple modifications, the starch has good flowability and storage stability of oxidized starch, has the advantages of strong shearing resistance, acid and alkali resistance, good thermal stability and the like of cross-linked starch, and has the advantages of high paste transparency, good freeze thawing stability, strong ageing resistance and the like of carboxymethyl starch. The prepared rubber powder can be quickly dissolved in cold water; the rubber solution is uniform and granule-free; and the wall painting putty prepared by mixing the rubber solution, talcpowder, heavy calcium powder, water and the like in a certain ratio has the advantages of strong adhesive force, painting smoothness and the like. Moreover, the wall painting putty is environment-friendly and nontoxic, and has obvious social and economic benefits.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to a rubber powder synthesis process using a one-step dry method of oxidation, post-crosslinking, and etherification, in particular to a preparation process of special rubber powder for architectural coatings. Background technique [0002] Rubber powder for construction is used as an auxiliary material (adhesive) for building materials, mainly used to prepare glue; it is used in the production of architectural coatings, putty powder for interior and exterior walls, thermal insulation mortar, etc. At present, most of the wall adhesives with good quality in the domestic market are imported products, which are expensive. Most of the domestically produced products are modified by single etherification or added with suitable auxiliary materials, and there is a certain gap in their water solubility and stability. Such as CN200910086703.X, name: a kind of rubber powder for construction, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18C08B31/12C08J3/24C08K5/1515C09D103/10C09D103/08
Inventor 冯鹰张鹏魏思
Owner JIANGXI RENFENG AGRI DEV
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