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Aldehyde-free adhesive and preparation method thereof

A technology of adhesives and oxidants, applied in the direction of adhesives, etc., can solve the problems of high price, complicated production process, and difficult to guarantee the quality of wood-based panels

Active Publication Date: 2010-11-24
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It may be that the quality of wood-based panels produced by using this type of adhesive is difficult to guarantee, or the price is relatively high and the production process is relatively complicated. This type of adhesive has not yet been sold in the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, the preparation of formaldehyde-free binder

[0030] Prepare 1000 g of a colorless and transparent PVA1799 (average degree of polymerization: 1700-1850) aqueous solution with a mass percentage of 10%, add 2 g of potassium persulfate, and stir and oxidize at 50° C. for 2 hours. Then 2 grams of a 20% aluminum sulfate solution were added, as well as a solution containing 0.15 grams of borax. Stir evenly, then add 0.2% of the total system weight of sodium lauryl sulfate, stir evenly and cool down to room temperature, then add 5% flour of the total system mass, stir evenly and discharge to obtain the formaldehyde-free adhesive.

Embodiment 2

[0031] Embodiment 2, the preparation of formaldehyde-free binder

[0032] Prepare 1000 grams of a colorless and transparent PVA2099 (average degree of polymerization: 2000-2150) aqueous solution with a concentration of 20%, add 3 grams of ammonium persulfate, and oxidize under stirring for 2 hours at 60° C. Then add OP-107 grams; then add 16 grams of MDI and react at a temperature of 50° C. for 2 hours. Then add 0.4% of the total weight of the system dioctyl sodium sulfosuccinate, stir evenly and cool down to room temperature, then add 5% of the total weight of the system light calcium carbonate, stir evenly and discharge to obtain the formaldehyde-free adhesive.

Embodiment 3

[0033] Embodiment 3, the preparation of formaldehyde-free binder

[0034]Prepare 1000 g of a colorless and transparent PVA1788 (average degree of polymerization: 1700-1850) aqueous solution with a mass percentage of 15%, add 1.5 g of potassium persulfate, and stir and oxidize at 40° C. for 1.5 hours. Then add 1.5 grams of TDI (Cangzhou Dahua 80 / 20) solution, and a solution containing 0.15 grams of borax. Stir evenly, then add 0.2% of the total system weight of sodium dodecylsulfonate, stir evenly and cool down to room temperature, then add 8% of the total system mass of flour, stir evenly and discharge to obtain the formaldehyde-free adhesive.

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PUM

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Abstract

The invention discloses an aldehyde-free adhesive and a preparation method thereof. The preparation method comprises the following steps of: (1) oxidizing polyvinyl alcohol by using an oxidizing agent to obtain oxidized and modified polyvinyl alcohol, wherein the average degree of polymerization of the polyvinyl alcohol is between 1,000 and 2,500; (2) crosslinking the oxidized and modified polyvinyl alcohol by using a cross-linking agent to obtain cross-linked polyvinyl alcohol; and (3) adding a surfactant and fillers into solution of the cross-linked polyvinyl alcohol, and stirring uniformly to obtain the aldehyde-free adhesive. The aldehyde-free adhesive can replace white latex (polyvinyl acetate emulsion) completely in numerous application fields, and can be used as an adhesive for interior-wall building materials as well as interior-wall ceramic tiles, wall paper, wall cloth, carpets, office supplies and leather.

Description

technical field [0001] The invention relates to a formaldehyde-free adhesive and a preparation method thereof, belonging to the field of fine chemicals. Background technique [0002] After more than 10 years of rapid development, my country's wood industry has become the world's largest wood-based panel production country in recent years, and its wood adhesive production has ranked first in the world. In 2009, the production scale of wood-based panels exceeded 100 million m 3 , with an annual output value of over 100 billion; annual glue consumption of more than 3 million tons, and an output value of over 10 billion. The wood-based panels that occupy the absolute majority of the market are made of urea-formaldehyde resin glue, phenolic resin glue and melamine-formaldehyde resin glue, and the formaldehyde emission of such adhesives and their glued products has always been the biggest problem. With the enhancement of people's awareness of environmental protection and the imp...

Claims

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Application Information

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IPC IPC(8): C09J129/14C08F16/06C08F8/06
Inventor 王凤奇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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