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Starch adhesive and preparation method thereof

A starch adhesive, starch technology, applied in the directions of starch-derived adhesives, adhesives, adhesive types, etc., can solve the problems of poor water resistance, poor storage stability, etc., and achieve good fluidity and antifreeze. Large, good storage stability

Active Publication Date: 2018-03-09
GUANGDONG YULAN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a starch adhesive and its preparation process to overcome the problems of poor water resistance and poor storage stability of existing starch adhesives.

Method used

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  • Starch adhesive and preparation method thereof
  • Starch adhesive and preparation method thereof
  • Starch adhesive and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0027] The application discloses a preparation method of starch adhesive, comprising the following steps:

[0028] (1) Preparation of the nanocellulose suspension: immerse the paper product in a sulfuric acid solution, heat, shear and stir for a certain period of time, wash and dialyze;

[0029] (2) Preparation of polyvinyl alcohol solution: the polyvinyl alcohol is dissolved in water, hydrochloric acid is added dropwise, a surfactant is added and dissolved;

[0030] (3) Preparation of dialdehyde starch solution: the starch and water are formulated into starch emulsion, the oxidant and hydrochloric acid are added, and the reaction solution is obtained by heating for a certain period of time, and the reaction solution is subjected to suction filtration, washing, and hot water dissolution;

[0031] (4) Add the nanocellulose suspension, the polyvinyl alcohol solution and the crosslinking agent into the dialdehyde starch solution, heat and stir for a certain period of time, adjust...

Embodiment 1

[0039] A starch adhesive, in parts by weight, comprising: 50 parts of nanocellulose suspension, 50 parts of starch, 1 part of oxidizing agent, 20 parts of polyvinyl alcohol, 0.05 part of surfactant and 0.25 part of crosslinking agent.

[0040] The starch is a mixed starch of corn starch, tapioca starch and potato starch, the oxidizing agent is potassium permanganate, the surfactant is a mixture of alkyl sodium sulfate and sodium pyrophosphate, and the crosslinking agent is a silane coupling agent containing epoxy groups.

[0041] The preparation method of starch adhesive, comprises the following steps:

[0042] (1) Preparation of nanocellulose suspension: immerse the paper product in a sulfuric acid solution with a mass fraction of 50%, heat, shear and stir for 2.5 hours, wash and dialyze;

[0043] (2) Preparation of polyvinyl alcohol solution: dissolve polyvinyl alcohol with water, add dropwise a mass fraction of 35% hydrochloric acid, add surfactant and dissolve;

[0044] (...

Embodiment 2

[0046] The specific components and contents of the starch adhesives in Examples 2-14 and Comparative Examples 1-2 are different from those in Example 1, as shown in Table 1. In Table 1, starch, oxidant, surfactant, crosslinking agent, and drier are mixtures, and the proportions of each component are weight ratios. The preparation method of Example 2 is the same as that of Example 1. The preparation methods of Examples 3-14 and Comparative Example 1-2 are added after heating and stirring and before adjusting the pH. With embodiment 1.

[0047] Table 1:

[0048]

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Abstract

The application provides a starch adhesive. The starch adhesive is prepared from the following components in parts by weight: 50 to 150 parts of nanocellulose suspension, 50 to 150 parts of starch, 1to 10 parts of an oxidant, 20 to 80 parts of polyvinyl alcohol, 0.01 to 5 parts of a surfactant and 0.25 to 10 parts of a crosslinking agent. The starch adhesive has good properties including good waterproof performance, good storage stability, excellent initial adhesion, great adhesion, good flowability and good coagulation resistance. The application further provides a preparation method of thestarch adhesive. The preparation method comprises the following steps: (1) preparing the nanocellulose suspension, preparing a polyvinyl alcohol solution and preparing a dialdehyde starch solution; and (2) mixing the dialdehyde starch solution, the nanocellulose suspension, the polyvinyl alcohol solution and the crosslinking agent and stirring and reacting with certain pH value and temperature toprepare the starch adhesive. According to the method provided by the invention, starch and waste paper products are used as raw materials, aldehyde substances are not added in a reaction process and water is used as a solvent; and a production technology and a product have an environment-friendly property and all the raw materials can react sufficiently.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a starch adhesive and a preparation method thereof. Background technique [0002] Wallpaper glue is an adhesive specially used to paste wallpaper. At present, there are many kinds of wallpaper adhesives on the market, which can be generally divided into two categories: synthetic polymer adhesives and biological starch adhesives. Bio-starch adhesives have gradually replaced synthetic polymer adhesives and become the mainstream of wallpaper adhesives due to their advantages of low-carbon environmental protection, formaldehyde-free, and high cost performance. [0003] There are three main reasons for this: firstly, starch itself has the potential as an adhesive, and starch and its derivatives have good adhesiveness and film-forming properties, and are excellent natural resource adhesives; secondly, starch is a kind of adhesive with wide sources and low price High-quality, low-cost, environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C09J101/02C09J11/06C09J11/08C09J11/04C08B31/18
CPCC08B31/18C08L2205/025C08L2205/035C08L2205/16C09J11/04C09J11/06C09J11/08C09J101/02C09J103/10C08L3/10C08L29/04C08L1/02
Inventor 张小琼刘朝生陆勇新龙有恩
Owner GUANGDONG YULAN GRP
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