Method for preparing environment-friendly type adhesive by using sodium hydrogen sulfite to process dissociative aldehyde

A technology of sodium bisulfite and adhesive, applied in the direction of adhesive, can solve problems such as physical harm, and achieve the effect of simple process and easy control of reaction process

Inactive Publication Date: 2008-08-06
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, whether it is the method of reducing the content of formaldehyde in the product by negative pressure in the past, or the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 60g of polyvinyl alcohol and 360g of water into a four-necked round bottom flask with a stirrer, stir at 90°C to dissolve them completely, cool down to 55°C, add 5g of oxalic acid, stir to dissolve, and then add 40% ethyl alcohol Dialdehyde 10g, reacted at 65°C until the viscosity reached 3500cp, then added sodium hydroxide to neutralize to PH6, cooled to a temperature of 45°C, added 1.0g of saturated sodium bisulfite solution, to make it just mix with the free state of ethylene dialdehyde The aldehyde just reacted, and the adhesive was obtained by cooling to room temperature again, and no free aldehyde was detected in sampling analysis.

Embodiment 2

[0014] Add 60g of polyvinyl alcohol and 360g of water into a four-necked round bottom flask with a stirrer in the laboratory, stir at 90°C to dissolve them completely, cool down to 55°C, add 5g of oxalic acid, stir to dissolve and then Add 10g of glyoxal, react at 65°C until the viscosity reaches 3500cp, then add sodium hydroxide to neutralize to pH 6.5, cool to 45°C, but do not add sodium bisulfite solution, add an equal amount of Distilled water, cooled to room temperature again to obtain the adhesive, sampling and analysis of free aldehyde content 0.2%.

Embodiment 3

[0016] Add 60g of polyvinyl alcohol and 360g of water into a four-neck round bottom flask with a stirrer, stir at 90°C to dissolve them completely, cool down to 55°C, add 5g of citric acid, stir to dissolve, and then add 40% ethylene glycol 20g of aldehyde, reacted at 65°C until the viscosity reached 3500cp, then added sodium hydroxide to neutralize to PH6, cooled to a temperature of 45°C, added 2.0g of saturated sodium bisulfite solution, to make it just mix with free glyoxal React just right, cool down to room temperature again to get the adhesive, no free aldehyde was detected in sampling analysis.

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Abstract

The invention relates to a method for using sodium acid sulfite saturated solution to treat free aldehyde in polyvinyl acetal adhesive to prepare environment-friendly adhesive, which comprises using weak acid/weak acid salt buffer to stabilize the pH value of the adhesive at 5.5 to 6.5, adding saturated sodium acid sulfite solution and biformyl solution into the system at a weight ratio of 0.05-0.1:1 to process addition reaction on free aldehyde to generate glyoxal hydroxyl mahogany mahogany soap. The invention provides an environment-friendly adhesive preparation method with simple process and low cost.

Description

technical field [0001] The invention relates to a method for preparing an environment-friendly adhesive by treating free aldehyde with saturated sodium bisulfite solution. In particular, polyvinyl acetal adhesives are treated with a saturated solution of sodium bisulfite to cause an addition reaction of free aldehyde groups to generate sodium hydroxysulfonate, which provides a simple, low-cost, and environmentally-friendly production method for adhesives. field of molecular chemistry. Background technique [0002] Most polyvinyl acetal adhesive products contain a toxic and volatile formaldehyde. The harmful gas of formaldehyde not only pollutes the environment, but also affects the health of operators and users, especially children. In order to reduce the formaldehyde content in polyvinyl acetal adhesives, free formaldehyde is generally removed by circular spraying under negative pressure, which not only complicates the process but also greatly increases the production cost...

Claims

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Application Information

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IPC IPC(8): C08F6/00C09J129/14C08K3/30
Inventor 赵斌斌李彬李建生王刚张禄岩
Owner TIANJIN VOCATIONAL INST
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