Polycarbodiimide cross-linking agent, preparation method and application thereof, and composition containing polycarbodiimide cross-linking agent

A polycarbodiimide and cross-linking agent technology, applied in organic chemistry, coating, etc., can solve the problems of coating hardness not meeting the requirements, low reactivity, poor substrate adhesion, etc.

Active Publication Date: 2021-04-09
SHANGHAI LANGYI FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the water-soluble polycarbodiimide crosslinking agent has low reactivity, the hardness of the coating after

Method used

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  • Polycarbodiimide cross-linking agent, preparation method and application thereof, and composition containing polycarbodiimide cross-linking agent
  • Polycarbodiimide cross-linking agent, preparation method and application thereof, and composition containing polycarbodiimide cross-linking agent
  • Polycarbodiimide cross-linking agent, preparation method and application thereof, and composition containing polycarbodiimide cross-linking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Add 1000g of hexamethylene diisocyanate (HDI) into a 5L three-necked flask, protect it with nitrogen gas, add 2g of 3-methyl-1-phenyl-2-phosphene-1-oxide (MPPO), and keep at 160°C The reaction was carried out for 8 hours to obtain a HDI prepolymer (0.99mol) with a degree of polymerization of about 5. The temperature of the system was lowered to 120° C., 235 g (1.99 mol) of butoxyethanol was added, and the reaction was carried out for 2 hours. The NCO value of the system dropped to 0, and 1016 g of polycarbodiimide compound was obtained. Get 76g diisooctyl sulfonate sodium succinate and dissolve and disperse in 1524g propylene glycol methyl ether acetate (solubility parameter is 9.4), join in the polycarbodiimide compound while stirring, after stirring for 1h, the solid content obtained is 40 % translucent liquid, which is the final highly reactive water-soluble polycarbodiimide crosslinker A.

Embodiment 2

[0081] Add 1000g of isophorone diisocyanate (IPDI) into a 5L three-necked flask, protect it with nitrogen gas, add 2g of 3-methyl-1-phenyl-2-phosphene-1-oxide (MPPO), at 160°C After 12 hours of reaction, an IPDI prepolymer (0.75 mol) with a degree of polymerization of about 5 was obtained. The temperature of the system was lowered to 120° C., 179 g (1.51 mol) of butoxyethanol was added, and the reaction was carried out for 2 hours. The NCO value of the system dropped to 0, and 1014 g of polycarbodiimide compound was obtained. Get 76g of diisooctyl sulfonate sodium succinate and dissolve and disperse it in 1521g of propylene glycol methyl ether acetate (solubility parameter is 9.4), join in the polycarbodiimide compound while stirring, after stirring for 1h, the solid content is 40 % translucent liquid, which is the final highly reactive water-soluble polycarbodiimide crosslinker B.

Embodiment 3

[0083] Add 1000g of dicyclohexylmethane diisocyanate (HMDI) to a 5L three-necked flask, protect it with nitrogen gas, add 2g of 3-methyl-1-phenyl-2-phosphene-1-oxide (MPPO), and heat at 160°C The reaction was carried out for 24 hours to obtain a HMDI prepolymer (0.63mol) with a degree of polymerization of about 5. The temperature of the system was lowered to 120° C., 150 g of butoxyethanol (1.27 mol) was added, and the reaction was carried out for 2 hours. The NCO value of the system dropped to 0, and 996 g of polycarbodiimide compounds were obtained. Get 75g diisooctyl sulfonate sodium succinate and dissolve and disperse in 1494g propylene glycol methyl ether acetate, join in the polycarbodiimide compound while stirring, obtain the translucent liquid that solid content is 40% after stirring 1h, That is the final highly reactive water-soluble polycarbodiimide crosslinker C.

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Abstract

The invention discloses a polycarbodiimide cross-linking agent, a preparation method and application thereof, and a composition containing the polycarbodiimide cross-linking agent. The polycarbodiimide cross-linking agent comprises a compound shown as a formula (1) and a water-soluble organic solvent, wherein in the compound shown as the formula (1), R1 is a divalent aliphatic hydrocarbon group with 1-18 carbon atoms or a divalent alicyclic hydrocarbon group with 3-13 carbon atoms, R2 is a divalent aliphatic hydrocarbon group with 1-10 carbon atoms, R3 is H, an alkyl group with 1-5 carbon atoms or an alkoxy group with 1-5 carbon atoms, and n is 1-10. The polycarbodiimide cross-linking agent provided by the invention has relatively high reaction activity at room temperature, can be quickly cross-linked and cured, and has a wide application prospect in the field of water-based coatings/adhesives.

Description

technical field [0001] The invention relates to a polycarbodiimide crosslinking agent, its preparation method, application and composition containing it. Background technique [0002] In recent years, with the strengthening of my country's environmental protection and the successive introduction of "oil to water" policies, water-based resins have developed rapidly. Compared with traditional solvent-based resins, although water-based resins have many advantages, some of their defects, such as low degree of crosslinking, poor mechanical properties, weak adhesion to certain substrates, unsatisfactory solvent resistance, and water resistance, are also disadvantages. restricted its development. Therefore, water-based resins are often used together with water-based crosslinking agents to improve their performance. As we all know, aziridine and carbodiimide are two crosslinking agents that can react with carboxyl groups. Aziridine has high reactivity, but short pot life and high...

Claims

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Application Information

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IPC IPC(8): C08G18/02C09D133/04C09D7/63C09D7/65C07C267/00
CPCC08G18/025C09D133/04C09D7/63C09D7/65C07C267/00C08K5/29C08L79/00
Inventor 唐晓峰丁群董建廷张文彬
Owner SHANGHAI LANGYI FUNCTIONAL MATERIALS
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