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Urea-formaldehyde resin curing agent and preparation method thereof

A technology of urea-formaldehyde resin and curing agent, which is applied in the field of raw material preparation for wood-based panel processing, can solve the problems of accelerating the decomposition of urea-formaldehyde resin to release formaldehyde, etc., and achieve the effects of improving bonding strength, enhancing stability, and low cost

Active Publication Date: 2021-11-02
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can speed up the curing process of urea-formaldehyde resin, because the curing agent remains in the adhesive layer after the resin is cured, it cannot be released or neutralized, resulting in the possibility of accelerating the decomposition of urea-formaldehyde resin to release formaldehyde. The concentration of formaldehyde in the body is zero, and the product may still release formaldehyde

Method used

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  • Urea-formaldehyde resin curing agent and preparation method thereof
  • Urea-formaldehyde resin curing agent and preparation method thereof
  • Urea-formaldehyde resin curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0029] A kind of urea-formaldehyde resin curing agent of the present invention, this urea-formaldehyde resin curing agent is made up of the component of following parts by weight:

[0030]

[0031]

[0032] Mix magnesium chloride and water as component A, mix ammonium aluminum sulfate, aluminum sulfate, ammonium persulfate, and polyvinyl alcohol as component B, and the mass ratio of component A to component B in the urea-formaldehyde resin curing agent is 1: 3.

[0033] The preparation method of the urea-formaldehyde resin curing agent of the present embodiment may further comprise the steps:

[0034] In parts by weight, dissolve 25 parts of magnesium chloride in 50 parts of pure water, stir to accelerate dissolution, and mix uniformly to obtain component A; 30 parts of crosslinking agent mixed with aluminum ammonium sulfate and aluminum sulfate, 20 parts of Mix ammonium sulfate and 5 parts of polyvinyl alcohol, and stir to obtain component B; mix component A and compon...

Embodiment 2

[0036] A kind of urea-formaldehyde resin curing agent of the present invention, this urea-formaldehyde resin curing agent is made up of the component of following parts by weight:

[0037]

[0038] Mix magnesium chloride, magnesium sulfate, and water as component A, and mix aluminum ammonium sulfate, ammonium chloride, and polyvinyl alcohol as component B. The mass ratio of component A to component B in the urea-formaldehyde resin curing agent is 1: 4.

[0039] The preparation method of the urea-formaldehyde resin curing agent of the present embodiment may further comprise the steps:

[0040] In parts by weight, dissolve 20 parts of magnesium chloride and 10 parts of magnesium sulfate in 60 parts of pure water, stir to accelerate dissolution, and mix well to obtain component A; 30 parts of ammonium aluminum sulfate, 20 parts of ammonium chloride, 10 parts of poly Mix vinyl alcohol and stir evenly to obtain component B; mix component A and component B according to a mass ra...

Embodiment 3

[0042] A kind of urea-formaldehyde resin curing agent of the present invention, this urea-formaldehyde resin curing agent is made up of the component of following parts by weight:

[0043]

[0044] Mix magnesium chloride, magnesium sulfate, and water as component A, and mix aluminum ammonium sulfate, ammonium aluminum sulfate, ammonium persulfate, ammonium chloride, and polyvinyl alcohol as component B. In the urea-formaldehyde resin curing agent, component A is mixed with The mass ratio of component B is 1:2.5.

[0045] The preparation method of the urea-formaldehyde resin curing agent of the present embodiment may further comprise the steps:

[0046]In parts by weight, dissolve 15 parts of magnesium chloride and 15 parts of magnesium sulfate in 100 parts of pure water, stir to accelerate the dissolution, and mix well to obtain component A; mix 30 parts of crosslinked aluminum sulfate and aluminum sulfate agent, 20 parts of ammonium salt mixed with ammonium persulfate and...

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Abstract

The invention provides a urea-formaldehyde resin curing agent. The urea-formaldehyde resin curing agent comprises the following raw materials: magnesium salt, water, crosslinking agent, ammonium salt, dispersing thickener, accelerator, and interface mediator. The present invention also provides a preparation method of the urea-formaldehyde resin curing agent, comprising the following steps: dissolving magnesium salt in water, stirring to accelerate dissolution, and mixing uniformly to obtain component A; mixing crosslinking agent, ammonium salt, and polyvinyl alcohol, After stirring evenly, component B is obtained; mix component A and component B according to the mass ratio of 1:1~8, then add accelerator, mix well, then add interface conditioner, continue mixing evenly, and obtain urea-formaldehyde resin curing agent . The urea-formaldehyde resin curing agent prepared by the method can effectively reduce the release of free formaldehyde in the urea-formaldehyde resin, accelerate the curing rate of the urea-formaldehyde resin, shorten the curing time of the urea-formaldehyde resin, and the curing temperature is 5-5% lower than that of the existing ammonium chloride curing agent. 15°C, while increasing the bonding strength of plywood.

Description

technical field [0001] The invention belongs to the technical field of preparation of wood-based panel processing raw materials, and in particular relates to a urea-formaldehyde resin and a preparation method thereof. Background technique [0002] At present, with the sustained and healthy development of my country's economy, the demand for wood-based panels in domestic home decoration, furniture manufacturing and other industries is growing rapidly. Urea-formaldehyde resin has attracted widespread attention due to its advantages such as high bonding strength, abundant and easy-to-obtain raw materials, and low cost. Demand is also rising. However, the urea-formaldehyde resin releases a large amount of formaldehyde during use, which is easy to pollute the environment, so the urea-formaldehyde resin must be modified. Reducing the F / U molar ratio of the resin is a more effective way to reduce the release of free formaldehyde. However, due to the long curing time of urea-formald...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/24C08L29/04C08K3/16C08K3/30C08K3/28C08K3/22C08K5/544C08K5/5435
Inventor 卿彦吴义强刘明李新功李贤军左迎峰
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY