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A kind of preparation method of linear urea-formaldehyde resin curable by ultraviolet light

A technology of urea-formaldehyde resin and ultraviolet light, which is applied in polyurea/polyurethane coatings, coatings, etc., can solve the problem of less urea-formaldehyde resin, and achieve the effects of fast curing speed, low energy consumption, and excellent gloss

Active Publication Date: 2017-04-05
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the open patents about urea-formaldehyde resins, there are few reports on urea-formaldehyde resins cured by ultraviolet light.

Method used

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  • A kind of preparation method of linear urea-formaldehyde resin curable by ultraviolet light

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Embodiment 1

[0030] In parts by mass, the following examples are the same.

[0031] 1) Modification of urea-formaldehyde resin: Dissolve an appropriate amount of urea-formaldehyde resin (molecular weight: 2750) in methanol, add sodium borohydride at -30°C for reduction, and react for 16 hrs, then remove the solvent by rotary evaporation to obtain Hydroxyl urea-formaldehyde resin (45% solids).

[0032] 2) A four-necked flask, a mechanical stirrer, a constant pressure funnel, a condenser and a thermometer are installed on the oil bath, and 11 parts of isophorone diisocyanate (IPDI) passed through nitrogen, the amount of modified urea-formaldehyde with hydroxyl 0.04% of the total mass of resin and IPDI was added to a four-necked flask, and slowly added 80 parts of modified urea-formaldehyde resin with hydroxyl groups at a temperature of 40 ° C. After 40 minutes, the dropwise addition was completed, and the temperature was raised. To 55°C, react at this temperature for 2 hrs, and the reaction...

Embodiment 2

[0035] 1) Modification of urea-formaldehyde resin: Dissolve an appropriate amount of urea-formaldehyde resin (molecular weight: 2750) in methanol, add sodium borohydride at -30°C for reduction, and react for 16 hrs, then remove the solvent by rotary evaporation to obtain Hydroxyl urea-formaldehyde resin (45% solids).

[0036] 2) A four-necked flask, a mechanical stirrer, a constant pressure funnel, a condenser and a thermometer are installed on the oil bath, and 9 parts of dicyclohexylmethane diisocyanate (HMDI) passed through nitrogen, the amount of which is modified with hydroxyl 0.05% of the total mass of urea-formaldehyde resin and HMDI was added to a four-necked flask, and 82 parts of modified urea-formaldehyde resin with hydroxyl groups were slowly added dropwise at a temperature of 40°C. After 30 minutes, the dropwise addition was completed and the temperature was raised To 55°C, react at this temperature for 2 hrs, and the reaction is always carried out under the prote...

Embodiment 3

[0039] 1) Modification of urea-formaldehyde resin: Dissolve an appropriate amount of urea-formaldehyde resin (molecular weight: 2750) in methanol, add sodium borohydride at -30°C for reduction, and react for 14 hrs, then remove the solvent by rotary evaporation to obtain Hydroxyl urea-formaldehyde resin (45% solids).

[0040] 2) A four-necked flask, a mechanical stirrer, a constant pressure funnel, a condenser and a thermometer are installed on the oil bath, and 10 parts of toluene diisocyanate (TDI) passed through nitrogen, the amount of which is the modified urea-formaldehyde resin with hydroxyl and Add 0.04% of the total mass of TDI dibutyltin dilaurate into a four-necked flask, and slowly add 83 parts of modified urea-formaldehyde resin with hydroxyl groups dropwise at a temperature of 50 ° C. After 40 min, the dropwise addition is completed, and the temperature is raised to 55 °C. °C, react at this temperature for 3 hrs, and the reaction is always carried out under the pr...

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Abstract

The invention discloses a preparation method for an ultraviolet curable linear urea formaldehyde resin. The method includes: modifying urea formaldehyde resin into hydroxyl equipped urea formaldehyde resin, then reacting the hydroxyl equipped urea formaldehyde resin with diisocyanate, and introducing (methyl) acrylic acid hydroxy ester to prepare ultraviolet curable urea formaldehyde resin, which can have high crosslinking density and excellent comprehensive performance. In preparation of the resin provided by the invention, unsaturated acrylate is employed for termination to ensure the crosslinking density of the polymer after photocuring, so that the cured product has a very excellent glossiness, mechanical properties, water resistance, and solvent resistance. At the same time, ultraviolet curing has the characteristics of fast curing rate, low energy consumption, easy automated production, etc.

Description

technical field [0001] The invention relates to a preparation method of ultraviolet-curable linear urea-formaldehyde resin. Background technique [0002] Urea-isobutyraldehyde-formaldehyde resin (UIF) is an important multifunctional coating additive, which has good yellowing resistance and excellent solubility. It can not only improve the adhesion of the coating film, but also improve the gloss and properties such as hardness. The application level of paint additives has become one of the symbols to measure the technical level of paint production. Coating additives are an important component material in coating products. Its addition can not only avoid many structural defects and disadvantages of coating films, but also make the production and construction of coatings easy to implement and control. The addition of certain additives can endow the material with some special functions. Although the relative amount of most additives used in coatings is usually very small, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/54C08G12/40C09D175/14C09D161/32
CPCC08G12/40C08G18/282C08G18/544C08G18/672C08G18/673C08G18/73C08G18/755C08G18/758C08G18/7614C09D175/14C08G18/54C08L61/32
Inventor 刘晓暄刘伟黄国辉崔艳艳
Owner GUANGDONG UNIV OF TECH
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