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Low-release aldehyde adhesive and its preparation method and use

An adhesive and reaction technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., to achieve the effect of increasing the degree of cross-linking, overcoming the low bond strength, and reducing the formaldehyde content

Inactive Publication Date: 2005-09-21
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore existing adhesive needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Synthesis of urea-formaldehyde resin:

[0035] Add 500 kg of formaldehyde into the reaction kettle, turn on the agitator, adjust the pH of the solution to 8.3 with sodium hydroxide, and when the temperature rises to 30°C, add the first batch of 150 kg of urea, 3 kg of starch and 5 kg of polyvinyl alcohol, and evenly heat up to 90°C, heat preservation reaction for 30 minutes, then quickly cool down to 85°C, heat preservation reaction for 10 minutes, adjust the pH of the reactant to 4.4 with a weak acid, and continue the heat preservation reaction. Take a drop of the reaction solution and drop it into ice water. When the reaction solution appears white flocs in the ice water When solidified, add the second batch of 80 kg of urea and 20 kg of melamine, quickly cool down to 75°C, keep the temperature for 30 minutes, adjust the pH of the solution to 7.3 with alkali, add the third batch of urea 45 kg, keep the temperature for 10 minutes, and use hydrogen Sodium oxide is used ...

Embodiment 2

[0055] Synthesis of urea-formaldehyde resin:

[0056] Add 550 kg of formaldehyde into the reaction kettle, turn on the agitator, adjust the pH of the solution to 8.3 with sodium hydroxide, and when the temperature rises to 30°C, add the first batch of 160 kg of urea, 4 kg of flour and 6 kg of polyvinyl alcohol, and evenly heat up to 90°C, heat preservation reaction for 30 minutes, then quickly cool down to 85°C, heat preservation reaction for 10 minutes, adjust the pH of the reactant to 4.4 with a weak acid, and continue the heat preservation reaction. Take a drop of the reaction solution and drop it into ice water. When the reaction solution appears white flocs in the ice water When solidified, add the second batch of urea 85 kg and polyacrylic acid emulsion 25 kg, quickly cool down to 75 ° C, heat preservation reaction for 30 minutes, adjust the pH of the solution with alkali to 7.3, add the third batch of urea 40 kg, heat preservation reaction for 10 minutes, Use sodium hyd...

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PUM

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Abstract

The invention discloses a low release aldehyde adhesive agent which comprises in the proportion of urea formaldehyde condensate of 100 shears, filler of 18-25 shears, curing agent of 1.0-2.0 shears, reinforcing agent P of 1.0-2.0 shears and curing accelerating agent Pa of 0.06-0.12 shear, wherein the reinforcing agent P is a water-soluble polyisocyanates and process art of low release aldehyde adhesive agent comprises the following steps: A, the preparation of thiourea resin, B, adding the said thiourea resin in a container, running the agitator and adding the filler slowly, intimate mixing and adding the curing agent, intimate mixing adding the accelerating agent dissolved using water, stirring, meter adding addition agent P slowly and stirring to get the low release aldehyde adhesive agent. The said low release aldehyde adhesive agent can be used in binding between wood and wood. In the invention, the content of methyl aldehyde is decreased in the preparation process.

Description

technical field [0001] The invention relates to a construction adhesive, in particular to a low-release aldehyde adhesive, its preparation method and its application. Background technique [0002] With the improvement of material living standards, people's requirements for living environment are getting higher and higher. Developed countries such as the United States, Canada, Japan and Western Europe have conducted comprehensive and systematic basic research on the impact of building materials on indoor air and formulated strict regulations. In recent years, some domestic research departments have begun to conduct research on the detection and evaluation of indoor air quality, and explore the impact of various types of materials on air pollution. Especially decoration and decoration materials, such as wood lacquer, paint, furniture, floor, wood-based panels and adhesives, etc., if these materials are not effectively controlled, the toxic substances they release slowly may a...

Claims

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Application Information

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IPC IPC(8): C09J161/24
Inventor 李晓平许戌令顾逸平
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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