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Modified starch based adhesion agent for lumber and preparation method

An adhesive, starch-based technology, used in the fields of fine chemicals and polymer materials, can solve the problems of increased viscosity, poor chemical stability, and less addition of adhesives.

Inactive Publication Date: 2009-08-19
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the -NCO group of PAPI can react with water to form urea and polyurea, resulting in an increase in the viscosity of the adhesive and poor chemical stability, so the amount added is very small, and the properties of the adhesive are not changed much.

Method used

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  • Modified starch based adhesion agent for lumber and preparation method
  • Modified starch based adhesion agent for lumber and preparation method
  • Modified starch based adhesion agent for lumber and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Gelatinization and oxidation of starch:

[0028] Add 8.0g of starch and 100ml of distilled water to a three-port reactor equipped with a stirring device and a constant temperature water bath to form a starch emulsion, raise the temperature to 45°C, stir for 20min, raise the temperature to 85°C, and adjust the pH value with 10% NaOH solution To 9-10, react for another 20 minutes, add 1.2 g of hydrogen peroxide with a mass fraction of 20% and continue to react for 30 minutes to complete the starch gelatinization and oxidation treatment;

[0029] (2) Grafting of starch and PVA:

[0030] Next, add 12.0g of PVA to the three-port reactor equipped with gelatinized and oxidized starch, heat to 95°C and stir, adjust the pH value to 2-3 with HCl solution with a mass fraction of 10%, and add 2.5g of PVA in turn. Potassium persulfate solution with a concentration of 1% by mass fraction and 1.0 g of emulsifier OP-10 were reacted for 30 minutes to obtain the main adhesive agent;...

Embodiment 2

[0034] In step (1), glutinous rice flour consumption is 10.0g, and oxidant is the hydrogen peroxide of massfraction 20%, and consumption is 0.5g; In step (2), PVA consumption is 20.0g, and initiator is massfraction 1% ammonium persulfate, consumption 2.0g. G; Modifier is urea modified melamine-formaldehyde resin in step (3), and consumption is 15.0g; Other raw materials and reaction conditions are with embodiment 1.

Embodiment 3

[0036]In the step (1), the starch is cornstarch, the gelatinization and oxidation temperature of the starch are 80° C., the oxidizing agent is a 10% sodium hypochlorite solution in an amount of 4.0 g; the modifying agent in the step (3) is an aqueous SBS emulsion, and the amount is 15.0 g , filler is silica powder, consumption is 50g; Other raw materials and reaction conditions are the same as embodiment 1.

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PUM

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Abstract

The invention provides an adhesive for modified starch-based wood and a preparation method thereof. Starch and polyvinyl alcohol are taken as raw materials of the adhesive, the main agent of the adhesive is obtained by pretreating the starch via pasting, oxidizing, and the like, and grafting with the polyvinyl alcohol, the main agent is modified by adding in waterborne SBS emulsion or melamine-formaldehyde resin, so that the formaldehyde-free environment-friendly adhesive is prepared. The adhesive strength, the water resistance property, and the like of the adhesive meet requirement of national standard GB / T5849-2006, and release amount of free formaldehyde meet E0 level standard. The invention has the advantages of convenient use and moderate cost, and is applicable to manufacture of plyboards and furnitures.

Description

technical field [0001] The invention belongs to the fields of fine chemicals and polymer materials, and in particular relates to an adhesive for modified starch-based wood and a preparation method thereof. Background technique: [0002] my country's forestry resources are scarce. In order to make up for the shortage of wood resources, the wood-based panel industry has developed rapidly, which has led to the vigorous development of the wood adhesive industry. According to statistics, the total consumption of wood adhesives in my country in 2007 was more than 3 million tons, and it increased year by year. At present, my country mainly uses adhesives prepared mainly from urea-formaldehyde resins or phenolic resins, but the most serious problem with these two adhesives is that free formaldehyde will be produced during use, which will have a serious impact on the environment and health (reference Liu Yuhuan, Ruan Rongsheng, Zheng Dandan, etc. Research Status and Prospects of Star...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02C09J161/28C09J161/30C09J153/02C09J161/32
Inventor 张龙王靖哲
Owner CHANGCHUN UNIV OF TECH
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