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Trimeric cyanamide-formaldehyde resin and its preparing process

A melamine and formaldehyde resin technology, used in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of affecting the health of users and high formaldehyde emission, and achieve less glue making process and preparation. simple craftsmanship

Inactive Publication Date: 2007-11-14
李军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, urea-formaldehyde resin is generally used as the adhesive for wood-based panels in China. Although the cost is low, the amount of formaldehyde released is high, which affects the health of users.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 200kg of formaldehyde and 70kg of water into a 1-ton reactor, stir evenly, and adjust the pH to 9.5 with alkali; then add 100kg of melamine, stir evenly, and raise the temperature of the reactor to 80°C; keep warm for 4-6 hours; take glue samples 10 drops are used to measure the water-soluble ratio, and when the measured value is 0.6-1.1, stop the heat preservation; cool down to below 50°C, and discharge.

Embodiment 2

[0017] Add 195kg of formaldehyde and 65kg of water into a 1-ton reactor, stir evenly and adjust the pH to 10 with alkali; then add 100kg of melamine, stir evenly and raise the temperature of the reactor to 80°C; keep the reaction for 4 to 6 hours; take glue samples 10 drops are used to measure the water-soluble ratio, and when the measured value is 0.6-1.1, stop the heat preservation; cool down to below 50°C, and discharge.

Embodiment 3

[0019] Add 190kg of formaldehyde and 60kg of water into a 1 ton reactor, stir evenly and adjust the pH to 9.5 with alkali; then add 90kg of melamine, stir evenly and raise the temperature of the reactor to 80°C; keep warm for 4 to 6 hours; take glue samples 10 drops are used to measure the water-soluble ratio, and when the measured value is 0.6-1.1, stop the heat preservation; cool down to below 50°C, and discharge.

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PUM

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Abstract

The invention discloses a molecule which is special for consisting of different material in weight: melamine (9-10slices), methanol (19-20slices), water (6-7 slices). The steps of preparation as follows: (1). Put methanol (9-10 slices) and water (6-7 slices) into reaction still, stir fully and then adjust the PH by alkali to 9-10. (2). Put melamine (9-10 slices) into that reaction still, stir it fully, and then elevate the temperature to 80-85Deg.c. (3). Interact log ether in that temperature four 4-6 hours. (4). Sample the mucus, estimate the PH, while it is between 0.6 and 0.1, and stop the insulation. (5). Cool it under 50Deg.c and take it out. This invention is easy in process and technique, and has long shelf-life; the concentration of free aldehyde is under 1%, so it is not harmful for environment.

Description

technical field [0001] The invention relates to an adhesive, in particular to a resin adhesive prepared by copolymerizing melamine and formaldehyde as raw materials. Background technique [0002] Adhesives used as auxiliary materials for wood-based panels often determine the quality and grade of wood-based panels. At present, urea-formaldehyde resins are generally used as adhesives for wood-based panels in China. Although the cost is low, the amount of formaldehyde released is high, which affects the health of users. With the improvement of people's requirements on the indoor environment, the development of low-toxicity and high-quality adhesives for wood-based panels has become a research hotspot. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a low-toxic and high-quality adhesive for wood-based panels prepared from melamine and formaldehyde. [0004] Technical scheme of the present invention is as follows: ...

Claims

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Application Information

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IPC IPC(8): C09J161/28
Inventor 李军李建
Owner 李军