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Environmental-friendly urea-formaldehyde resin adhesive and production method thereof

A technology for urea-formaldehyde resins and adhesives, which is applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., and can solve the new requirements for reducing formaldehyde emissions, increased product costs, and large amounts of additives. , achieve the effect of improving structure, good effect and ensuring quality

Inactive Publication Date: 2010-12-29
南宁市火炬新产品开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]In the existing urea-formaldehyde resin adhesive production technology, the molar ratio of formaldehyde to urea is F / U≥1.0, and it is difficult to achieve the reduction of formaldehyde emission that occurs continuously in various wood-based panels In addition, the amount of additives used is relatively large, resulting in an increase in product costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Formula:

[0028] The Moore of formaldehyde and urea is f / u = 0.963, with a concentration of 37 % formaldehyde 510kg, 400kg of urea, and 2.5kg of a composite assistant.Among the composite additives, 0.88 kg of starch phosphate, 0.8 kg of sodium chloride, 0.25 kg of polyvinyl alcohol, 0.3 kg of melamine, 0.14 kg of ammonium ammonium alcohol, and 0.13 kg of hexal methamphetamine.

[0029] 2. Preparation process:

[0030] (1) Put the formaldehyde solution 510kg into the reactor at a time, start the mixer, start heating and heating, stop heating when the temperature is 40 ° C, and adjust the pH value of 25-30 % sodium hydroxide water solution to 7.5-8.0.

[0031] (2) Add the composite additive 2.5kg and the first batch of urea 175kg, that is, after the first time the urea is put into urea, the Moore of the formaldehyde and urea is f / u 1 = The amount of feeding at 2.2, stop heating when the temperature is increased to 70 ° C, and then naturally heating to 90 ° C.The pH value ...

Embodiment 2

[0036] 1. Formula:

[0037] The Moore of formaldehyde and urea is f / u = 0.95, with a concentration of 37 % formaldehyde 503.2kg, 400kg of urea, and 1.36kg composite aid.Among the composite additives, 1.0 kg of oxide starch, 0.2 kg of melamine, 0.1 kg of ammonium ammonium alfallate, and 0.06 kg of six metamine tetramine.

[0038] 2. Preparation process:

[0039] (1) Putting the formaldehyde solution 503.2kg into the reactor at a time, start the mixer, start heating and heating, stop heating when the temperature is 40 ° C, and use 25-30 % of the hydroxide water solution to 7.5-8.0.

[0040] (2) Add the first batch of urea 175kg, that is, the Moorbi of the formaldehyde and urea of formaldehyde and urea after the first investment of urea is f / u 1 = The amount of feeding at 2.17, stop heating when the temperature is increased to 70 ° C, and then naturally heating to 90 ° C.The pH is detected between 6.5-7.0 and keeps warm for 30 minutes.

[0041] (3) Use 25-30 % molecosate solution to ...

Embodiment 3

[0045] 1. Formula: F / U = 0.98, F / U = 0.98, 519.1kg of F / U = 0.98, 400kg of urea, 2.7kg of composite additives, 2.7kg of composite additives, 0.2 kg of sodium phosphate, 0.3 kg of starch acetate, 0.3 kg of starch., 0.1 kg of potassium chloride, 0.2 kg of ammonium ammonium albate, 1.6 kg of melamine, and 0.3 kg of allamine.

[0046] 2. Preparation process:

[0047] (1) Put the formaldehyde solution 519.1kg into the reactor at a time, start the mixer, start heating up and heating, stop heating when the temperature is 40 ° C, and use 25-30 % of sodium hydroxide aqueous solution to adjust the pH value of 7.5-8.0.

[0048] (2) Add the first batch of urea 175kg, that is, the first time the urea is put into urea and the Moores of the formaldehyde and urea are f / u 1 = 2.24, the amount of feeding, stop heating when the temperature is increased to 70 ° C, and then naturally heating to 90 ° C.The pH is detected between 6.5-7.0 and keeps warm for 30 minutes.

[0049] (3) Use 25-30 % of the hyd...

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Abstract

The invention discloses an environmental-friendly urea-formaldehyde resin adhesive and a production method thereof. The production method comprises the following steps: lowering the traditional mol ratio (F / U) of the formaldehyde to urea into 0.94-1.0 from not less than 1.0; keeping the mol ratio basically unchanged after feeding the urea for the first time and the second time in the traditional process, increasing the urea amount for the third time, and adding a compound adjuvant which accounts for 0.1%-0.3% of the weight of the urea-formaldehyde resin adhesive for producing synergistic effect; in the acidic polycondensation stage, observing until a white vaporous shape appears in water at 40-45 DEG C by a muddy point method; and adjusting the pH value of a reactant into 6.5 from a traditional value of 7.5 so that the added urea for the second time can continuously participate in reaction, then observing until a white vaporous shape appears in water at 60-65 DEG C by the muddy point method for the second time, and finally ending reaction. The production method can obviously lower formaldehyde release of an artificial board and product cost of the adhesive, and ensure product quality of the urea-formaldehyde resin adhesive and physical and mechanical properties of the artificial board.

Description

Technical field: [0001] The present invention is a method of production of artificial plate glue adhesive preparation technology, which involves the production method of mileohydrum resin adhesives. Background technique: [0002] Due to the rich raw materials, the low price, high adhesion strength, good water -soluble, light color, and fast solidification due to their rich raw materials, so it is still the main glue of artificial plate adhesive.However, there are also disadvantages to release formaldehyde, poor aging resistance, and poor water resistance.With the increasing awareness of environmental safety and safety today, how to reduce the amount of formaldehyde release of artificial boards and overcome its shortcomings is an urgent issue.To reduce the amount of formaldehyde release of the artificial board, the first is to improve the preparation technology of rigiddehyde resin adhesives.There are literature reports that the traditional 'weak alkali-weak acid-weak alkali' is a...

Claims

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Application Information

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IPC IPC(8): C09J161/24
Inventor 张运明
Owner 南宁市火炬新产品开发有限责任公司
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