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Formula and preparation method of one-component aromatic polyurea coating

An aromatic, one-component technology, used in polyurea/polyurethane coatings, fire-retardant coatings, coatings, etc., can solve the problems of poor storage stability, low tensile strength and elongation, limited application areas, etc., and achieve stable performance. , the preparation method is simple

Inactive Publication Date: 2019-03-01
浙江锦丰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness, tensile strength and elongation of one-component aliphatic polyurea coatings are lower than those of two-component coatings, and their storage stability is poor, especially in some specific occasions (such as environments with high content of acetone, ethylene glycol, and engine oil). Or the environment above 100 ℃), the tensile strength and elongation are lower, which greatly limits its application field

Method used

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  • Formula and preparation method of one-component aromatic polyurea coating
  • Formula and preparation method of one-component aromatic polyurea coating
  • Formula and preparation method of one-component aromatic polyurea coating

Examples

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Embodiment 1

[0051] A single-component aromatic polyurea coating formula and its preparation method In the formula described in the formula, unless otherwise specified, the percentages in the present invention are all mass percentages.

[0052] Toluene diisocyanate / diphenylmethane diisocyanate 20-40%, adipic acid polyester diol (molecular weight 2000) 15-25%, trifunctional polyether diol 5-10% (molecular weight 400), poly Tetrahydrofuran dibasic ether (molecular weight 1000) 20-25%; 1,4-butanediol 3-5%; JH-306 ketimine (molecular weight 320) 10-15%; dibutyltin dilaurate 0.1-0.5% , Aromatic oil 5-20%.

[0053] S1, first put 13.2g adipic acid polyester diol (molecular weight 2000), 2.6g trifunctional polyether diol (molecular weight 400) and 29.7g polytetrahydrofuran divalent ether (molecular weight 1000) into the stirring In a four-necked flask reactor including a reactor, a thermometer, a dropping funnel, and a reflux condenser. Turn on the vacuum pump to vacuumize the four-neck flask reactor...

Embodiment 2

[0063] Naphthalene diisocyanate (molecular weight 210) 20-40%, isophthalic acid diol (molecular weight 2000) 10-20%, trifunctional polyether diol 5-10% (molecular weight 400), polytetrahydrofuran binary Ether (molecular weight 1000) 20-40%; 1,4-butanediol 3-5%; ketimine JH-306 (molecular weight 320) 10-15%; dibutyltin dilaurate 0.1-0.5%, aromatic oil 5-20%.

[0064] S1, first put 9.4g isophthalic diol (molecular weight 2000), 2.4g trifunctional polyether diol (molecular weight 400) and 29.7g polytetrahydrofuran dihydric ether (molecular weight 1000) into the mixer , Thermometer, dropping funnel, reflux condenser tube in a four-necked flask reactor. Turn on the vacuum pump to vacuumize the four-neck flask reactor, and maintain the vacuum degree of the four-neck flask reactor above -0.095MPa. Use oil bath or water bath heating method to heat the materials in the four-neck flask reactor to 110°C and keep the temperature between 110-120°C, vacuum and keep the temperature for 2h. A...

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Abstract

The invention relates to a formula and a preparation method of a one-component aromatic polyurea coating. The one-component aromatic polyurea coating is prepared from the following materials in partsby weight: 20-40 parts of aromatic isocyanate, 10-15 parts of polyester polyol, 5-10 parts of polyether polyol, 26-28 parts of polytetrahydrofuran polyether, 3-5 parts of butanediol, 10-15 parts of ketimine, 0.1-0.5 part of an organotin catalyst and 5-20 parts of solvent oil. The preparation method comprises the steps of enabling the ketimine, as a sealing agent, and an aromatic isocyanate-based prepolymer to coexist in the same reaction system, and isolating the system from air by using an inert gas or nitrogen; once the system is in contact with the air, eliminating the sealing of the ketimine under the action of water, so that the released terminal amino group (-NH2) rapidly reacts with -NCO so as to form the one-component aromatic polyurea. The one-component aromatic polyurea coating provided by the invention has higher mechanical properties and stable performance at a high temperature, and can adapt to a high temperature working environment of 100-140 DEG C. The process provided by the invention is simple, does not require large equipment, and is suitable for large-scale popularization and application.

Description

Technical field [0001] The invention relates to a polyurea coating, in particular to a preparation method of a one-component aromatic polyurea coating. Background technique [0002] Polyurea is composed of isocyanate-terminated prepolymer (-NCO) and amino compound (-NH 2 ) The curing agent reacts to form a high molecular polymer containing urea bonds. Polyureas can generally be divided into two-component compositions and one-component compositions. The amino group in the two-component polyurea reacts quickly with the -NCO group, and no catalyst is required. Due to the fast reaction speed of the two-component polyurea, it is cured and formed in a very short time and the film forming speed is too fast. Therefore, it is difficult to obtain a smooth coating surface during the spraying process, and sometimes even discontinuous coatings appear. At the same time, the two-component polyurea coating has poor impact resistance, poor flexibility, poor thermal stability, and a complex prep...

Claims

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Application Information

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IPC IPC(8): C09D175/02C08G18/66C08G18/48C08G18/42C08G18/32
CPCC08G18/3206C08G18/4018C08G18/4211C08G18/4238C08G18/4825C08G18/4829C08G18/4854C08G18/6607C09D5/18C09D175/02
Inventor 唐忠锋匡仁灯叶景荣
Owner 浙江锦丰新材料科技有限公司
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