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Method for synthesizing polyvinyl acetal acid safety adhesive

A technology of polyvinyl acetal acid and polyvinyl alcohol, which is applied in the field of polymer chemistry, can solve the problems of non-waterproof, inconvenient use, low acetal degree, etc., and achieves the effect of adjustable performance and high elasticity

Inactive Publication Date: 2008-07-30
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

When the degree of acetalization is low, it cannot be waterproof after forming a film, which brings inconvenience to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Add 180ml of deionized water and 17g of polyvinyl alcohol into a 500ml four-necked bottle equipped with a stirrer, a thermometer and a dropping funnel, and heat to 85°C with an electric heating mantle to completely dissolve the polyvinyl alcohol. 7.4 g of 40% glyoxylic acid solution was added under stirring, and 10% hydrochloric acid solution was added dropwise to control the pH of the solution to 1-3. Continue to stir the reaction at 85°C, stop the condensation when the reaction system gradually thickens, a large number of bubbles or flocs appear in the system, adjust the pH value to 7-8 with 8% sodium hydroxide solution, and cool to obtain viscous Polyvinyl glyoxylic acid safety glue.

Embodiment 2

[0010] Add 180ml of deionized water and 17g of polyvinyl alcohol into a 500ml four-necked bottle equipped with a stirrer, a thermometer and a dropping funnel, and heat to 85°C with an electric heating mantle to completely dissolve the polyvinyl alcohol. 14.8 g of 40% glyoxylic acid solution was added under stirring, and 10% hydrochloric acid solution was added dropwise to control the pH of the solution to 1-3. Continue to stir the reaction at 85°C, stop the condensation when the reaction system gradually thickens and the system becomes jelly, adjust the pH value to 7-8 with 8% sodium hydroxide solution, cool to obtain polyvinyl acetal, Suitable for processing adhesive glue sticks.

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PUM

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Abstract

The invention relates to a method which uses non-toxic, tasteless and non-volatile glyoxylate to replace formaldehyde for composing polyvinyl acetal acid safe adhesive. The acetalation degree can be controlled in 20 to 40 percent by adjusting the usage mol ratio of polyvinyl alcohol to glyoxylate is 1 to 0.1-0.2. The polyvinyl acetal acid adhesive can self dry and film under normal temperature, the adhesive film does not dissolve in water after drying, and the adhesive is applicable for conglutinating paper products, building materials and fibers.

Description

technical field [0001] The invention relates to a method for synthesizing a safe chemical adhesive, in particular to a method for synthesizing a polyvinyl glyoxylic acid safe adhesive by using non-toxic, odorless and non-volatile glyoxylic acid instead of formaldehyde, and belongs to the field of polymer chemistry. Background technique [0002] Most of the existing stationery glues and home decoration glues are obtained by condensation of polyvinyl alcohol and formaldehyde under acidic conditions, and there are many related invention patents. After the reaction is completed, the residual amount of formaldehyde is high, and it is difficult to remove, which makes the glue smell, and there are potential safety hazards, especially for children who use this type of glue. In addition, this type of glue is insoluble in water when the degree of acetalization is high, and only soluble in organic solvents. When the degree of acetalization is low, it cannot be waterproof after forming...

Claims

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Application Information

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IPC IPC(8): C09J129/14C08F116/38
Inventor 杨莉莉冯海强李建生杨健申晓艳
Owner TIANJIN VOCATIONAL INST
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