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A kind of low formaldehyde-releasing urea-formaldehyde resin adhesive and preparation method thereof

A technology of urea-formaldehyde resin glue and low formaldehyde release, which is applied in the direction of adhesives, adhesive additives, aldehyde/ketone condensation polymer adhesives, etc., and can solve the problems of reduced curing strength of adhesives, long curing time of adhesives, and release of formaldehyde High light weight and other problems, to achieve the effect of good light transmission performance, excellent mechanical strength, high specific surface area

Active Publication Date: 2021-01-26
湖南福森竹木科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some breakthroughs and progress have been made, these treatment processes have problems such as high formaldehyde release, complicated operation process, reduced curing strength of adhesive, and long curing time of adhesive.
Using inorganic components such as attapulgite, bentonite, montmorillonite and other modified urea-formaldehyde resin adhesives is an ideal method. It can not only improve the bonding strength of the adhesive, reduce the amount of formaldehyde released, but also reduce production costs. , Increase the added value of the product, has attracted the general attention of researchers in recent years, but this method also has certain problems, such as the side effects such as gelation and precipitation are likely to be caused when preparing the adhesive, and the amount of formaldehyde released is still high

Method used

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  • A kind of low formaldehyde-releasing urea-formaldehyde resin adhesive and preparation method thereof

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Effect test

Embodiment 1

[0030] A low-formaldehyde release urea-formaldehyde resin adhesive, including urea-formaldehyde resin obtained by the reaction of formaldehyde and urea, urea-formaldehyde resin modifier, nanocellulose and additive polyvinyl alcohol, C 3 N 4 . The preparation method of above-mentioned urea-formaldehyde resin adhesive, comprises the following steps:

[0031] (1) Weighing 0.1molBiOCl and 0.15molZnS and adding them to 100ml of nanocellulose suspension with a mass fraction of 2.0wt%, stirring at high speed with a stirrer for 180min, drying at 40°C to obtain nanocellulose fibrils;

[0032] (2) Add 100 parts of formaldehyde into the four-necked flask, then add a pH regulator to adjust the pH to 8.5, then weigh the urea according to the molar ratio of formaldehyde: urea 1.2:1, and weigh the urea according to the mass ratio of 5:3: 1:1 divided into four parts (respectively U1, U2, U3 and U4);

[0033] (3) Add U1 to the pH-adjusted formaldehyde solution, add 20 parts of nanocellulose...

Embodiment 2

[0045] A low-formaldehyde release urea-formaldehyde resin adhesive, including urea-formaldehyde resin obtained by the reaction of formaldehyde and urea, urea-formaldehyde resin modifier, nanocellulose and additive polyvinyl alcohol, C 3 N 4 . The preparation method of above-mentioned urea-formaldehyde resin adhesive, comprises the following steps:

[0046] (1) Weigh 0.2molBi(NO 3 ) 3 ·5H 2 O and 0.15mol ZnS were added to 200ml of nanocellulose suspension with a mass fraction of 1.0wt%, stirred at high speed with a stirrer for 150min, and dried at 40°C to obtain nanocellulose fibrils;

[0047] (2) Add 180 parts of formaldehyde into the four-necked flask, then add a pH regulator to adjust the pH to 8.5, then weigh the urea according to the molar ratio of formaldehyde: urea 1.2:1, and weigh the urea according to the mass ratio of 5:3: 1:1 divided into four parts (respectively U1, U2, U3 and U4);

[0048] (3) Add U1 to the formaldehyde solution with adjusted pH, and add 25 p...

Embodiment 3

[0054] A low-formaldehyde release urea-formaldehyde resin adhesive, including urea-formaldehyde resin obtained by the reaction of formaldehyde and urea, urea-formaldehyde resin modifier, nanocellulose and additive polyvinyl alcohol, C 3 N 4 . The preparation method of above-mentioned urea-formaldehyde resin adhesive, comprises the following steps:

[0055] (1) Weigh 0.1molBi(NO 3 ) 3 ·5H 2 O, 0.1mol BiOCl, 0.15mol ZnS and SnO 2 Add it to 400ml of nanocellulose suspension with a mass fraction of 3.0wt%, stir with a stirrer at high speed for 180min, and dry at 40°C to obtain nanocellulose fibrils;

[0056] (2) Add 60 parts of formaldehyde into the four-necked flask, then add a pH regulator to adjust the pH to 8.5, then weigh the urea according to the molar ratio of formaldehyde: urea 1.2:1, and weigh the urea according to the mass ratio of 5:3: 1:1 divided into four (respectively U1, U2, U3 and U4);

[0057] (3) Add U1 to the pH-adjusted formaldehyde solution, add 10 part...

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Abstract

The invention discloses a low-formaldehyde-emission urea-formaldehyde adhesive which contains a urea formaldehyde resin obtained by reacting formaldehyde and urea, a urea formaldehyde resin modifier,nano-crystalline cellulose and an additive polyvinyl alcohol, wherein the content of free formaldehyde in the urea-formaldehyde adhesive is less than 0.6%. Correspondingly, the invention further provides a preparation method and application of the low-formaldehyde-emission urea-formaldehyde adhesive. The urea-formaldehyde adhesive or plywood prepared in the invention is low in free formaldehyde and has low formaldehyde emission.

Description

technical field [0001] The invention belongs to the field of adhesives, in particular to a urea-formaldehyde resin adhesive and a preparation method thereof. Background technique [0002] Adhesives are an essential ingredient in the manufacturing process of wood-based panels. At present, the use of urea-formaldehyde resin adhesives has accounted for 90% of the adhesives used for wood-based panels, accounting for more than 60% of the adhesives used in the entire wood processing industry. Compared with adhesives for wood-based panels such as phenolic resin and melamine-formaldehyde resin, urea-formaldehyde resin adhesives have the advantages of low cost, fast curing speed, good process performance, and convenient operation. However, like other aldehyde-containing resin adhesives, urea-formaldehyde resins also have fatal defects such as high free aldehyde content. The wood-based panels prepared with these aldehyde-containing adhesives will gradually release formaldehyde durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/24C09J11/04C09J11/08B27D1/08C08G12/12
CPCB27D1/08C08G12/12C08K2003/3036C08L2205/03C08L2205/035C08L2205/16C09J11/04C09J11/08C09J161/24C08L1/02C08L29/04C08K13/06C08K9/12C08K3/30C08K3/28C08K3/18C08K3/2279
Inventor 卿彦吴义强刘文杰罗莎李新功关鹏飞
Owner 湖南福森竹木科技有限公司