Modified urea-formaldehyde resin for producing ecological floors and preparation method for modified urea-formaldehyde resin

A urea-formaldehyde resin and modification technology, which is applied in the field of low-cost modified urea-formaldehyde resin and its preparation, can solve the problems of excessive formaldehyde content, poor storage stability, and poor water resistance, and achieve long storage period, long storage period, and boiling water resistance Good results

Inactive Publication Date: 2017-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-cost modified urea-formaldehyde resin for the production of ecological flooring with ultra-low formaldehyde release, high boiling resistance and low cost, aiming at the shortcomings of existing floor modified urea-formaldehyde resins, such as excessive formaldehyde content, poor water resistance, poor storage stability, and high cost. Resin and its preparation method, the modified urea-formaldehyde resin of the present invention has the advantages of formaldehyde emission less than 0.3mg / L, bonding strength greater than 0.8MPa, resistance to boiling water for 4 hours, storage period greater than 30 days and low cost, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of modified urea-formaldehyde resin for making ecological floor, its raw material is composed of: formaldehyde solution 1010Kg, urea 700Kg, molecular weight regulator 13Kg, strengthening agent 245Kg, 2300mL mass concentration is 25% formic acid solution, 2700mL mass concentration is 33% Sodium hydroxide solution, water 280Kg. The molecular weight regulator is isooctyl 3-mercaptopropionate (IOMP) from EVANS of the United States; the sub-strengthening agent is a mixture of aluminum silicate and melamine, and the mass ratio of aluminum silicate and melamine is 1:3.

[0039] A preparation method for making ecological floor modified urea-formaldehyde resin, the steps are as follows:

[0040] A. Add 1010Kg formaldehyde into the reactor, the formaldehyde mass concentration is 37.0%, and the methanol mass content is 1.1%; add 280Kg of water;

[0041] B, add 1500mL mass concentration and be 33% sodium hydroxide solution, adjust the pH value of the liquid in the reactor t...

Embodiment 2

[0052] A modified urea-formaldehyde resin with high boiling resistance and low cost for the manufacture of ecological flooring, including the following raw materials in parts by mass: 1090Kg of formaldehyde, 800Kg of urea, 170Kg of reinforcing agent, 23Kg of molecular weight regulator, 210Kg of water, mass concentration It is 30% sodium hydroxide solution and 28% formic acid solution in mass concentration.

[0053] The molecular weight modifiers are UN-345 and UN-346 produced by Dongguan Youke Decoration Materials Co., Ltd., and the two are mixed according to the mass ratio of 1:1.

[0054]The strengthening agent is a mixture of aluminum silicate, melamine and sodium chloride, and the mass ratio of aluminum silicate, melamine and sodium chloride is 1:5:3.

[0055] The specific manufacturing steps are as follows:

[0056] A. Add 1090Kg of formaldehyde into the reaction kettle, the mass concentration of formaldehyde is 37.1%, and the mass content of methanol is 0.7%; add 210Kg ...

Embodiment 3

[0068] A modified urea-formaldehyde resin with high boiling resistance and low cost for the manufacture of ecological flooring, including the following raw materials in parts by weight: 1050Kg formaldehyde, 760Kg urea, 190Kg reinforcing agent, 9Kg molecular weight regulator, 180Kg water, hydrogen oxidation Sodium solution and formic acid solution.

[0069] Molecular weight regulator adopts the isooctyl 3-mercaptopropionate (IOMP) of American Effens (EVANS).

[0070] The strengthening agent is a mixture of polyvinyl alcohol, melamine and calcium hydroxide, and the mass ratio of polyvinyl alcohol, melamine and calcium hydroxide is 1:11:4.

[0071] The specific manufacturing steps are as follows:

[0072] A. Add 1050Kg formaldehyde into the reaction kettle, the formaldehyde mass concentration is 36.9%, and the methanol content is 0.9%; add 180Kg of water;

[0073] B, add 1350mL mass concentration and be 40% sodium hydroxide solution, adjust the pH value of the liquid in the rea...

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Abstract

The invention discloses modified urea-formaldehyde resin for producing ecological floors and a preparation method for the modified urea-formaldehyde resin. The method comprises the following steps: adding formaldehyde to a reaction kettle; adjusting a liquid pH value in the reaction kettle to 7.5-8.5; adding a first part of urea to the reaction kettle, and raising temperature of the reaction kettle; adding a formic acid solution, and adjusting the pH value to 4.3-5.0; adjusting the pH value to 5.8-6.8, adding a second part of urea, a first part of a reinforcing agent and a first part of a molecular weight modifier, and performing a reaction for 15-45 minutes; adjusting the pH value to 7.0-8.5, adding a second part of a molecular weight modifier, then adding a second part of a reinforcing agent, and performing a reaction until resin is water-clear at the temperature of 13-20 DEG C; adjusting the pH value to 8.5-9.5, starting water cooling, and adding a third part of urea; and continuously performing cooling until the temperature is 40-50 DEG C, and releasing glue to obtain the modified urea-formaldehyde resin. The modified urea-formaldehyde resin provided in the invention has the characteristics of a long storage period, an ultra-low formaldehyde release amount, high bonding strength, boiling water resistance, low costs and the like.

Description

technical field [0001] The invention relates to a modified urea-formaldehyde resin, in particular to a modified urea-formaldehyde resin used for manufacturing ecological floors with ultra-low formaldehyde emission, high boiling resistance and low cost, and a preparation method thereof. Background technique [0002] Ecological flooring is mainly used for indoor floor decoration, and should have good water resistance, and the lower the formaldehyde emission, the better. Therefore, it is required that the urea-formaldehyde resin used in the manufacture of ecological flooring has higher boiling water resistance, lower free formaldehyde and the characteristics that it is not easy to degrade after curing. In order to reduce the amount of formaldehyde released, the existing urea-formaldehyde resin manufacturing technology generally reduces the molar ratio of formaldehyde to urea, but with the reduction of the molar ratio, the storage period of the resin becomes shorter and the bond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40C08G12/38C08K3/34
CPCC08G12/422C08G12/38C08K3/34
Inventor 袁道升陈玉坤
Owner SOUTH CHINA UNIV OF TECH
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