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Urea-formaldehyde resin adhesive and preparation method and application thereof

A technology of urea-formaldehyde resin adhesives and adhesives, which is applied in adhesives, aldehyde/ketone condensation polymer adhesives, manufacturing tools, etc., and can solve problems such as threats to human health and the impact on the mechanical properties of bonded products

Active Publication Date: 2017-05-31
福建和其昌树脂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Products made of trialdehyde glue will have continuous release of formaldehyde, and formaldehyde is a potential carcinogen, threatening human health
However, these adjustments have an impact on the mechanical properties of the bonded product

Method used

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  • Urea-formaldehyde resin adhesive and preparation method and application thereof
  • Urea-formaldehyde resin adhesive and preparation method and application thereof
  • Urea-formaldehyde resin adhesive and preparation method and application thereof

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preparation example Construction

[0034] The present invention provides a method for preparing the urea-formaldehyde resin adhesive described in the above technical solution, comprising the following steps:

[0035] After mixing formaldehyde, water, the first part of urea, a coupling agent and polyethylene glycol, a first polycondensation reaction is carried out to obtain a first polycondensate;

[0036] After adjusting the pH value of the first polycondensate to 6-6.5, mixing with the second portion of urea and lignin to perform a second polycondensation reaction to obtain a second polycondensate;

[0037] After adjusting the pH value of the second polycondensate to 7.5-8, mixing it with the remaining urea to carry out the third polycondensation reaction to obtain the third polycondensate;

[0038] adjusting the pH value of the third condensation polymer to 7-7.5 to obtain the urea-formaldehyde resin adhesive.

[0039] The present invention mixes formaldehyde, water, the first part of urea, a coupling agent ...

Embodiment 1

[0054] Weigh 139 parts of formaldehyde solution with a mass fraction of 37% and add it to the reaction kettle at one time, and add 15 parts of water to adjust the pH value to 8.5. For the first time, add 55.5 parts of urea with a purity of 98%, and then add 3 parts of KH550 And 2 parts of polyethylene glycol (400), open the steam and stir to heat up.

[0055] The temperature of the reaction kettle was raised from below 50°C, and after 40 minutes of heating, the temperature was raised to 90°C, and the reaction was kept at 90°C for 30 minutes. After the holding time expires, under the condition that the temperature is kept at 90°C, first adjust the pH value to 5.8, then adjust the pH value to 5.0 after 10 minutes, and then adjust the pH value to 4.7 after another 8 minutes. Test the viscosity, when the viscosity reaches 16S (25°C, apply 4# cup), adjust the pH value to 6.2, add 21.5 parts of urea with a purity of 98% for the second time, and add 3 parts of ground wood lignin, rea...

Embodiment 2

[0062] Weigh 150 parts of formaldehyde with a mass fraction of 37% and add it to the reactor at one time, and add 5 parts of water to adjust the pH value to 8.8. For the first time, add 55.5 parts of urea with a purity of 98%, and then add 2 parts of KH560 and 1.5 parts of polyethylene glycol (400), turn on the steam and stir to raise the temperature.

[0063] The temperature of the reaction kettle was raised from below 50°C, and after 45 minutes, the temperature was raised to 95°C, and the reaction was kept at 95°C for 30 minutes. After the holding time is up, under the condition that the temperature is kept at 95°C, first adjust the pH value to 6.0, then adjust the pH value to 5.1 after 10 minutes, and then adjust the pH value to 4.5 after another 10 minutes. Test the viscosity, when the viscosity reaches 16.5S (25°C, apply 4# cup), adjust the pH value to 6.5, add 21.5 parts of urea with a purity of 98% for the second time, and add 3 parts of corncob lignin, and react for 30...

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Abstract

The invention provides a urea-formaldehyde resin adhesive which is prepared from the following raw materials in parts by weight: 100 parts of urea, 50-60 parts of formaldehyde, 5-10 parts of water, 0.5-3 parts of a coupling agent, 0.5-2 parts of polyethylene glycol and 0.5-5 parts of lignin. According to the urea-formaldehyde resin adhesive, the mechanical properties of a bonded product can be ensured while the formaldehyde emission is reduced. The urea-formaldehyde resin adhesive provided by the invention is milk white, the content of free formaldehyde is lower than 0.12%, the solid content is 41-58%, and the viscosity is 17-30S. In addition, according to a board prepared from the urea-formaldehyde resin adhesive, the static bending intensity is 20.1-28.9MPa, the elasticity modulus is 1689-2635MPa, the internal bonding strength is 0.39-0.58MPa, the thickness swelling rate of water absorption is 5.1-9.5%, and the formaldehyde emission is 0.11-0.42mg / L.

Description

technical field [0001] The invention relates to the technical field of organic materials, in particular to a urea-formaldehyde resin adhesive and a preparation method and application thereof. Background technique [0002] Through the adhesion and cohesion of the interface, the natural or synthetic, organic or inorganic substances that can connect two or more parts or materials together are collectively referred to as adhesives. With the growing of the wood-based panel industry, wood composite materials are widely used in the fields of house construction and home furnishing. For wood composites, the use of adhesives is essential. [0003] However, under the background that wood composite materials are widely used in house construction and home furnishing, etc., which are closely related to human life, the adhesives used are still mainly "trialdehyde" glues, namely urea-formaldehyde resin adhesives and phenolic resin adhesives. and melamine resin adhesive. The products prep...

Claims

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Application Information

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IPC IPC(8): C09J161/32C08G12/40B27D1/04
CPCB27D1/04C08G12/40C09J161/32
Inventor 郑忠福俞艳肖卫红马昭明陈长德
Owner 福建和其昌树脂科技有限公司
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