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A kind of preparation method of environment-friendly urea-formaldehyde resin adhesive

A urea-formaldehyde resin glue and adhesive technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem of large formaldehyde emission, achieve bright color, small formaldehyde emission, Effect of increasing resin content

Active Publication Date: 2019-05-10
PUER LINDA WOOD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of large amount of formaldehyde released by urea-formaldehyde resin adhesives during use, the present invention provides a preparation method of an environmentally friendly urea-formaldehyde resin adhesive, so that the urea-formaldehyde resin adhesive has high bonding strength and further obtains formaldehyde release. Eco-friendly plywood with low volume

Method used

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  • A kind of preparation method of environment-friendly urea-formaldehyde resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Prepare materials according to the following components by mass:

[0021] 1700 parts of formaldehyde, 700 parts of urea I, 160 parts of urea II, 270 parts of urea III, 300 parts of urea IV, 70 parts of ammonia water, 3.45 parts of melamine I, 315 parts of melamine II, 15.2 parts of melamine III, 1 part of lye;

[0022] Among them, formaldehyde is a formaldehyde solution with a mass concentration of 37%; ammonia water is an ammonia solution with a mass concentration of 0.8%; urea Ⅰ, urea Ⅱ, urea Ⅲ and urea Ⅳ are all conventional commercially available urea (solid), that is, four parts for preparation , and added in four times; melamine I, melamine II and melamine III are conventional commercially available melamine (solid), that is, prepared in three parts and added in three times; the lye is a sodium hydroxide solution with a mass concentration of 30%;

[0023] (2) Heat the formaldehyde in step (1) to 40°C with stirring, then add 30% sodium hydroxide solution to adj...

Embodiment 2

[0026] (1) Prepare materials according to the following components by mass:

[0027] 1600 parts of formaldehyde, 600 parts of urea I, 120 parts of urea II, 220 parts of urea III, 250 parts of urea IV, 50 parts of ammonia water, 3 parts of melamine I, 300 parts of melamine II, 13 parts of melamine III, 0.9 parts of lye;

[0028] Among them, formaldehyde is a formaldehyde solution with a mass concentration of 30%; ammonia water is an ammonia solution with a mass concentration of 0.5%; urea Ⅰ, urea Ⅱ, urea Ⅲ and urea Ⅳ are all conventional commercially available urea (solid), that is, four parts for preparation , and added in four times; melamine I, melamine II and melamine III are conventional commercially available melamine (solid), that is, prepared in three parts and added in three times; lye is a sodium hydroxide solution with a mass concentration of 25-40% ;

[0029] (2) Heat the formaldehyde in step (1) to 30°C with stirring, then add potassium hydroxide solution with a m...

Embodiment 3

[0032] (1) Prepare materials according to the following components by mass:

[0033] 1800 parts of formaldehyde, 800 parts of urea I, 200 parts of urea II, 300 parts of urea III, 350 parts of urea IV, 80 parts of ammonia water, 4.5 parts of melamine I, 340 parts of melamine II, 18 parts of melamine III, 1.1 parts of lye;

[0034] Among them, formaldehyde is a formaldehyde solution with a mass concentration of 40%; ammonia water is an ammonia solution with a mass concentration of 1%; urea Ⅰ, urea Ⅱ, urea Ⅲ and urea Ⅳ are all conventional commercially available urea (solid), that is, four parts for preparation , and added in four times; melamine I, melamine II and melamine III are conventional commercially available melamine (solid), which are prepared in three parts and added in three times; the lye is a sodium hydroxide solution with a mass concentration of 40%;

[0035](2) Heat the formaldehyde in step (1) to 55°C with stirring, then add sodium hydroxide solution with a mass ...

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Abstract

The invention discloses a preparation method of an environment-friendly urea-formaldehyde resin adhesive. The environment-friendly urea-formaldehyde resin adhesive is prepared from the following components in parts by mass: 1600-1800 parts of formaldehyde, 600-800 parts of urea I, 120-200 parts of urea II, 220-300 parts of urea III, 250-350 parts of urea IV, 50-80 parts of ammonia water, 3-4.5 parts of melamine, 300-340 parts of melamine II, 13-18 parts of melamine III and 0.9-1.1 parts of alkali liquor. The method optimizes the component proportioning, specially restricts the addition time of each component, and does not need any modifier; and the obtained adhesive has the advantages of small formaldehyde release amount and high resin content. When the adhesive is used for preparing the plywood, the flour consumption is low, the plywood reaches Grade E0, and thus, the adhesive is suitable for preparing environment-friendly indoor boards or indoor decorating boards. The preparation method has the advantages of simple formula, controllable operation, low cost, high product quality and the like.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly urea-formaldehyde resin adhesive, which belongs to the technical field of adhesives. Background technique [0002] Urea-formaldehyde resin is synthesized by addition-polycondensation reaction of urea and formaldehyde under the action of a catalyst. Generally, the "alkali-acid-alkali" synthesis process is used. Addition reaction occurs under alkaline conditions, and polycondensation reaction occurs under acidic conditions. Combined to form initial urea-formaldehyde resin, and then under the action of curing agent or auxiliary agent, it will form insoluble and infusible final thermosetting resin. The cured urea-formaldehyde resin is light in color, milky white or translucent, resistant to weak acids and alkalis, good insulation performance, excellent wear resistance, and cheap. It is the most widely used variety in adhesives. Especially in the manufacture of various wood-based pane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/30C08G12/38
CPCC08G12/38C09J161/30
Inventor 王成勇王德坤
Owner PUER LINDA WOOD CO LTD
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