Regulation and control method for preparation process for bio-oil starch adhesive for wood

A starch adhesive and a technology for the preparation process are applied in the directions of adhesives, graft polymer adhesives, adhesive types, etc. to achieve the effects of improving performance, ensuring adequacy, and preventing gelation

Active Publication Date: 2015-09-16
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to propose a method for regulating the preparation process of bio-oil starch adhesives for wood, through a whole set of pH value conversion curves, to easily and accurately regulate the various reaction processes of starch adhesives , reduce the gel problem and insufficient reaction of starch adhesives, and develop a high-performance and environmentally friendly starch adhesive regulation method for wood that is suitable for industrial mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Take corn starch as an example to introduce the implementation process of the present invention as follows:

[0031] 1) Mix 100 parts of corn starch and 140 parts of 0.5mol / L hydrochloric acid solution to prepare starch emulsion, stir evenly, add to the reactor, heat up to 55℃ within 15 minutes and keep the temperature in this interval until step 6; after reaching the temperature Add the oxidant ammonium persulfate until the pH value reaches 0.5, and keep the pH value for 60 minutes to obtain an acid hydrolyzed oxidized starch emulsion;

[0032] 2) Add 10 parts of the stabilizer polyvinyl alcohol with a mass fraction of 8% to the acid hydrolyzed oxidized starch emulsion obtained in step 1), and adjust the pH value to 4.4 with a sodium hydroxide solution with a mass fraction of 10%. The rate of pH change is slowly added to the grafting monomer acrylamide until the pH value reaches 4.8, and the pH value is maintained for 60 minutes; then 0.4 parts of initiator ammon...

Embodiment 2

[0038] Example 2: Take tapioca starch as an example to introduce the implementation process of the present invention as follows:

[0039] 1) Mix 100 parts of tapioca starch and 150 parts of 0.5mol / L hydrochloric acid solution to prepare starch emulsion, stir evenly, add to the reactor, heat up to 50℃ within 10 minutes and keep the temperature in this interval until step 6; after reaching the temperature Add the oxidant ammonium persulfate until the pH value reaches 0.6, and keep the pH value for 60 minutes to obtain an acid hydrolyzed oxidized starch emulsion;

[0040] 2) Add 20 parts of the stabilizer polyvinyl alcohol with a mass fraction of 8% to the acid hydrolyzed oxidized starch emulsion obtained in step 1), and adjust the pH value to 4.5 with a sodium hydroxide solution with a mass fraction of 10%. The rate of change of pH value was slowly added grafting monomer acrylamide until the pH value reached 4.9, and the pH value was maintained for 60 minutes; then 0.5 dose of ammoni...

Embodiment 3

[0046] Example 3: Take wheat starch as an example to introduce the implementation process of the present invention as follows:

[0047] 1) Mix 100 parts of wheat starch and 160 parts of 0.5mol / L hydrochloric acid solution to prepare starch emulsion, stir evenly, add to the reactor, heat up to 50℃ within 10 minutes and keep the temperature in this range until step 6; after reaching the temperature Add the oxidant ammonium persulfate until the pH value reaches 0.5, and keep the pH value for 60 minutes to obtain an acid hydrolyzed oxidized starch emulsion;

[0048] 2) Add 30 parts of the stabilizer polyvinyl alcohol with a mass fraction of 8% to the acid hydrolyzed oxidized starch emulsion obtained in step 1), and adjust the pH value to 4.4 with a sodium hydroxide solution with a mass fraction of 10%. The rate of pH change is slowly added grafting monomer acrylamide until the pH value reaches 4.8, and the pH value is maintained for 60 minutes; then 0.6 parts of initiator ammonium pers...

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PUM

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Abstract

The invention relates to a regulation and control method for a preparation process for a bio-oil starch adhesive for wood, and belongs to the technical field of adhesives. The regulation and control method comprises the following steps: adding ammonium persulphate in an emulsion obtained by mixing starch and hydrochloric acid to obtain an acid-hydrolyzed and oxidized starch emulsion; adding polyvinyl alcohol, adjusting the pH value by sodium hydroxide solution, adding grafting monomer acrylamide, and then adding ammonium persulphate to obtain a composite modified starch emulsion; adding bio-oil to obtain an initial bio-oil starch adhesive; and repeatedly adjusting the pH value by the sodium hydroxide solution and the bio-oil to obtain the bio-oil starch adhesive. The method is simple and convenient, accurate, moderate in reaction, simple in parameters, high in process stability, capable of reducing the gel problems and reaction insufficiency phenomena of the starch adhesive, guaranteeing a reaction sufficiency degree and improving the performances of the bio-oil starch adhesive, and suitable for industrial mass production; the prepared adhesive is excellent in performance, and capable of meeting the application requirements thereof in the field of wood.

Description

Technical field [0001] The invention belongs to the technical field of adhesive preparation, and particularly relates to a method for adjusting the preparation process of a bio-oil starch adhesive for wood. Background technique [0002] With the increasing depletion of petroleum resources and the continuous improvement of people's environmental protection requirements for adhesives, using cheap and easily available renewable polymer resources—starch as the main raw material, the preparation of high-performance green and environmentally friendly adhesives has become wood adhesives The focus of research. However, starch molecular chains have a large number of glycosidic bonds and hydroxyl groups. Adhesives prepared from them generally have disadvantages such as poor water resistance, poor storage stability, and low bonding strength, which severely restrict their rapid development. [0003] In view of the problems of starch adhesives, scholars at home and abroad have proposed various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02C08F251/00C08F220/56C08B31/18
Inventor 常建民虞宇翔姚思旭任学勇李婷婷姚娟
Owner BEIJING FORESTRY UNIVERSITY
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