Method for preparing starch modified latex and adhesive

A latex adhesive and starch modification technology, applied in the direction of starch adhesive, starch derived adhesive, adhesive type, etc., can solve the problems of low bonding strength, slow drying speed, etc., and achieve low price , high hardness, and the effect of reducing costs

Inactive Publication Date: 2011-03-30
刘力恒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large water content of the starch adhesive, the water penetrates into the surface of the bonded object, the drying speed is slow, and the bonding strength is not high, so it is generally only used in applications that do not require high bonding strength.

Method used

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Examples

Experimental program
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Embodiment Construction

[0019] The present invention will be further described below in conjunction with examples, but these examples should not be construed as limiting the protection scope of the present invention.

[0020] 1. Preparation of oxidized starch:

[0021] (1) Sodium hypochlorite 6, add water 30 to dissolve for later use. Sodium hydroxide 8, add water 20 to dissolve and set aside. Dissolve sodium sulfite 2 in water 10 for later use.

[0022] (2) Stir 100% of starch and 190% of water to prepare a starch emulsion, and adjust the pH to 9 with sodium hydroxide solution. Raise the temperature to 40-50°C, add half of the sodium hypochlorite solution dropwise in 20 minutes, and add the other half after 1 hour of reaction. After reacting for 1 hour, an aqueous solution of sodium sulfite was added, and the mixture was reacted for 1 hour at heat preservation. During the reaction, sodium hydroxide solution was added to maintain the pH value at 9.

[0023] 2. Starch gelatinization and esterific...

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PUM

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Abstract

The invention discloses a method for preparing a starch modified latex and adhesive. The starch modified latex and adhesive consists of two parts, namely starch latex and a starch latex adhesive, wherein the starch latex is prepared by steps of starch oxidation, pasting, reaction with polyvinyl alcohol and vinyl acetate and the like; the latex is prepared from the following components in percentage by mass: 5 to 15 percent of starch, 2 to 5 percent of polyvinyl alcohol, 5 to 15 percent of vinyl acetate, 0.5 to 1 percent of hydroxymethyl acrylamide, 0.3 to 1.0 percent of sodium hypochlorite, 0.1 to 0.5 percent of sodium sulfite, 0.5 to 1.0 percent of sodium hydroxide, 0.2 to 0.5 percent of ammonium persulfate and 45 to 55 percent of water; and the starch latex adhesive is enhanced by a filling method, and is prepared from the following components: 70 to 80 percent of starch modified latex, 5 to 15 percent of starch and 5 to 15 percent of kaolin. The preparation process for the starch latex adhesive is reasonable; and in the process of producing products, formaldehyde and organic solvents are not used, and three-waste emission is absent. The starch modified latex and adhesive is a modern environment-friendly adhesive taking water as a dispersing medium and having strong adhesion without toxicity, corrosion or pollution.

Description

technical field [0001] The invention relates to an adhesive, in particular to a starch-modified white latex adhesive, which is an adhesive used for interior decoration. Background technique [0002] Polyvinyl acetate emulsion is widely used in wood processing, furniture manufacturing, building decoration and other industries due to its rich source of raw materials, excellent bonding performance, convenient use and no pollution. It is the most widely used emulsion adhesive today. [0003] Because the steric hindrance of the ester group in the vinyl acetate molecule is small, it is easily hydrolyzed when it encounters water, especially as the temperature increases, the hydrolysis speed of the ester group is accelerated, resulting in poor water resistance of the PVAc emulsion film. At the same time, in the emulsion polymerization, adding a large amount of hydrophilic compounds such as polyvinyl alcohol and surfactant is also one of the reasons that affect the water resistance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C09J103/06C09J103/04C09J103/02C09J11/06
Inventor 刘力恒
Owner 刘力恒
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