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Urea-formaldehyde resin additive, preparing method and application thereof
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A kind of technology of urea-formaldehyde resin and auxiliary agent
Inactive Publication Date: 2009-11-25
EVERFIRST WISEFUND TECH BEIJING
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[0005] Aiming at the defects of poor preloading performance, low stability and short pot life of the existing urea-formaldehyde resin adhesives, the present invention provides a method that can effectively improve the pre-press performance and stability of the urea-formaldehyde resin adhesive and prolong its pot life. Urea-formaldehyde resin additives
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Embodiment 1
[0026] Urea-formaldehyde resin auxiliary agent of the present invention is produced according to the following steps:
[0027] 1. Prepare materials according to the following weight ratio:
[0034] 2. Add 450kg of water into the reaction kettle and raise the temperature to 45-50°C; then add polyvinyl alcohol, and after it dissolves, add ammoniumnitrate, sucrose, urotropine and calciumchloride in sequence, and cool down after all of them dissolve Instantly.
[0035] After testing, the main technical indicators of the obtained product are as follows: solid content: 18%, pH: 6.5-7.5; appearance: colorless transparent liquid.
Embodiment 2
[0037] Urea-formaldehyde resin auxiliary agent of the present invention is produced according to the following steps:
[0038] 1. Prepare materials according to the following weight ratio:
[0045] 2. Add 400kg of water into the reaction kettle and raise the temperature to 45-50°C; then add sodiumcarboxymethyl cellulose, and after it dissolves, add ammonium chloride, hexanehexanol, urea and sodium chloride in turn, and wait for all of them to dissolve After cooling down the temperature can be obtained.
[0046] After testing, the main technical indicators of the obtained product are as follows: solid content: 20%, pH: 6.5-7.5; appearance: colorless transparent liquid.
Embodiment 3
[0048] Urea-formaldehyde resin auxiliary agent of the present invention is produced according to the following steps:
[0049] 1. Prepare materials according to the following weight ratio:
[0056]2. Add 500kg of water into the reaction kettle and raise the temperature to 45-50°C; then add defatted protein and tapioca starch, and after they are dissolved, add diammonium phosphate, stearic acid, and sodium dihydrogen phosphate in sequence, and cool down after all of them are dissolved Cool down and serve.
[0057] After testing, the main technical indicators of the obtained product are as follows: solid content: 16%, pH: 6.5-7.5; appearance: colorless transparent liquid.
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Abstract
The present invention an urea-formaldehyde resin additive, a preparing method and an application thereof. The urea-formaldehyde resin additive comprises the following components: ammonium salt, polyhydroxy compound, pH buffering agent and filling agent. The urea-formaldehyde resin additive of the invention contains ammonium compound which reacts with the formaldehyde and generates urotropine. The reaction is reversible reaction and facilitates controlling the speed of polycondensation reaction so that the polycondensation reaction is executed uniformly for obtaining the urea-formaldehyde resin with homogeneous molecular weight distribution and the increase of the stability of the urea-formaldehyde resin is facilitated. The contained pH buffering agent increases the buffer capacity of the urea-formaldehyde resin and facilitates prolonging the pot life of the urea-formaldehyde resin. In the preparing process of urea-formaldehyde resin, the adding of the urea-formaldehyde resin additive can remarkably increase the prepressing performance of the adhesive and shorten the prepressing time. The prepared urea-formaldehyde resin adhesive has the advantages of high stability, greatly prolonged pot life, capacity for totally satisfying the production requirement of the veneer board and effectively increased production efficiency.
Description
technical field [0001] The invention relates to a wood adhesive additive, in particular to a urea-formaldehyde resin additive. The invention also relates to a wood adhesive containing the additive and their application in preparing wood-based panels, belonging to the field of wood adhesives. Background technique [0002] Over the past 30 years of reform and opening up, my country's wood industry, especially the wood-based panel industry, has achieved extraordinary rapid development. Wood-based panels are the products with the most intensive technology, the widest range of uses and the greatest development potential in the wood industry. With the enhancement of residents' consumption ability, the change of consumption concept and the implementation of my country's natural forest protection project, the demand for wood-based panels in industries such as decoration, furniture, packaging, shipbuilding, and automobiles will increase. In 2006, my country's wood-based panel output...
Claims
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Application Information
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