Preparation method of urea formaldehyde resin rubber powder

A technology of urea-formaldehyde resin glue and urea-formaldehyde resin, which is applied in the directions of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the deterioration of adhesive bonding strength, water resistance and aging resistance. , poor quality of wood products, etc., to achieve the effect of reducing the amount of free formaldehyde, improving the impregnation peel strength, and reducing the amount of formaldehyde released.

Active Publication Date: 2011-08-31
北京天维宝辰化学产品有限公司
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Problems solved by technology

[0007] The purpose of the present invention is to solve the irrationality of the urea-formaldehyde resin synthesis technology or spray drying process design when using the existing technology to reduce the formaldehyde release in the process of using the urea-formaldehyde resin. properties such as durability, aging resistance, etc., lead to poor quality of wood products, and then provide a preparation method of urea-formaldehyde resin powder

Method used

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  • Preparation method of urea formaldehyde resin rubber powder

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[0035] The preparation method also includes the following auxiliary agents: protective colloid, inorganic anti-coagulation agent and defoamer.

[0036] Described protective colloid is alcoholysis degree more than 90%, polyvinyl alcohol (PVA) that polymerization degree is 300~1200; Before use, polyvinyl alcohol is formulated into 20% aqueous solution, and the consumption (weight) of polyvinyl alcohol is controlled 4-10% of the total amount (weight) of the urea-formaldehyde resin polymer.

[0037] Inorganic anti-coagulation agent of the present invention comprises wherein a kind of in calcium carbonate, clay, silicon dioxide, aluminum silicate, talcum powder or kaolin, consumption (weight) is 5% in urea-formaldehyde resin polymer total amount (weight) ~20%.

Embodiment 1

[0041] Add 145.95 grams of formalin in a three-necked flask with a reflux condenser, then the reactor is warmed up to 60°C, and the pH value is adjusted to 2.0 with 10% HCl aqueous solution, and 42 grams of urea is added, and the temperature is continued until the reaction temperature reaches At 90°C, react for about 20 minutes; when the reaction becomes turbid, immediately cool down to 75°C and adjust the pH value to 8.5, add 12 grams of urea, and react for 30 minutes; then use NH 4 Adjust the pH value of Cl aqueous solution to 5.5 and react for 30 minutes; adjust the pH value to 8.0 again, add the remaining 6 grams of urea to the reactant, react for 30 minutes, cool the product to room temperature, and discharge it for later use.

Embodiment 2

[0043] Add 145.95 grams of formalin to a three-necked flask with a reflux condenser, then the reactor is warmed up to 60°C, and the pH value is adjusted to 2.0 with 10% formic acid aqueous solution, and 42 grams of urea is added, and the temperature is continued until the reaction temperature reaches At 90°C, react for about 20 minutes; when the reaction becomes turbid, immediately cool down to 80°C and adjust the pH value to 8.5, add 12 grams of urea and 3 grams of melamine, and react for 30 minutes; then use NH 4 Cl aqueous solution adjusts the pH value to 5.5, and reacts for 30 minutes; adjusts the pH value to 8.0 again, adds the remaining 6 grams of urea and 2.7 grams of tripolyhydroamine to the reactant, reacts for 30 minutes, and cools the product to room temperature. spare.

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Abstract

The invention discloses a preparation method of urea formaldehyde resin rubber powder, which comprises the following steps: firstly adding formalin with the design amount into a three-neck flask with a reflux condensation tube, regulating the pH value to 1.5-2.5, adding a first batch of urea accounting for 50-70% of the total amount into a reaction kettle, when being at the reaction temperature of 90-95 DEG C, immediately rapidly reducing the temperature to 75-80 DEG C when turbidity appears during the reaction, regulating the pH value to 8.0-9.0, adding a second batch of 10-29% urea, then regulating the pH value to 4.5-5.5, and reacting for 30-40 minutes; and further regulating the pH value to 7.0-8.0, adding a modifier, and performing the acid-base-acid-base process so as to synthesize urea formaldehyde resin prepared by the method, and the viscosity of stock solution does not change greatly in comparison with the ordinary process. After the rubber powder obtained by spray drying forms regenerated rubber with water, the free formaldehyde content is reduced, the bonding strength and the dipping and peeling strength are greatly improved, and the formaldehyde releasing amount is lower than 0.5%.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of urea-formaldehyde resin rubber powder. Background technique [0002] Urea-formaldehyde resin is a polymer obtained by the reaction of urea and formaldehyde, also known as urea-formaldehyde resin. Because the preparation raw materials of this resin are easy to obtain and the cost is low, when used as an adhesive, it also shows the characteristics of fast curing speed, good bonding strength, no pollution to the adherend, and good resistance to weak electrolytes, so it is widely used as Wood processing industry. However, when wood products using urea-formaldehyde resin adhesives are used for interior decoration, formaldehyde will be released into the living room; and formaldehyde has irritating effects on human eyes, mucous membranes and respiratory tract, and is also a potential carcinogen. Long-term inhalation of formaldehyde , human health will be greatly endanger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40C08G12/12C08J3/12C09J161/32
Inventor 王义
Owner 北京天维宝辰化学产品有限公司
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