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Rapid UV-cured hyperbranched polyurethane acrylate and preparation method thereof

A technology of urethane acrylate and acrylate, which is applied in the field of photosensitive materials, can solve the problems of affecting UV curing rate, slowing down of UV curing rate, poor mechanics and weather resistance, etc., and achieves fast UV curing rate, flatness without bubbles, and solvent resistance The effect of performance enhancement

Inactive Publication Date: 2020-04-17
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, polyurethane acrylate materials on the market have problems such as slow photocuring rate, poor mechanical properties and weather resistance, which limit their application and development.
Chinese patent CN108659192A uses hyperbranched polyether and hyperbranched polyester as the core to prepare hyperbranched polyurethane acrylate. Due to the low molecular weight of the synthesized hyperbranched polyurethane, this material has slow UV curing rate and poor mechanical properties.
Chinese patent CN107903373A mixes diisocyanate and dihydric alcohol in an aprotic solvent, reacts to obtain an intermediate, adds a monoamino polyhydroxy monomer to obtain a "core"; diisocyanate and a monoamino polyhydroxy monomer react in an aprotic solvent get ab 2 monomer, the AB 2 The monomer and the "nucleus" are mixed and reacted to obtain hyperbranched polyurethane; the hyperbranched polyurethane is added to maleic anhydride for terminal group modification, the hydroxyl-containing acrylate and diisocyanate are reacted to form a monomer, and a catalyst is added; then the two The products of the two reactions are mixed, and a catalyst is added; finally, a neutralizing agent is added, reacted, separated, and dried to obtain a white powdery UV photocurable hyperbranched waterborne polyurethane acrylate; but the hyperbranched polyurethane acrylate prepared by it is dispersed in the water phase, Since water is not volatile as a solvent, the UV curing rate is slowed down
Chinese patent CN107903372A uses diisocyanate monomers and monoamino polyhydroxy monomers to obtain hyperbranched polyurethanes with different algebraic terminal hydroxyl groups in a "one-step process"; body R, and then react R with a hydroxyalkyl acrylate monomer to obtain a semi-addition product F; react F with a hydroxyl-terminated hyperbranched polyurethane to obtain a UV light-curable flexible hyperbranched polyurethane acrylate resin; but in the end The transparency of the obtained polyurethane acrylate product is poor, which affects the UV curing rate, and the toughness of the cured film is also poor

Method used

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  • Rapid UV-cured hyperbranched polyurethane acrylate and preparation method thereof
  • Rapid UV-cured hyperbranched polyurethane acrylate and preparation method thereof
  • Rapid UV-cured hyperbranched polyurethane acrylate and preparation method thereof

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Embodiment 1

[0037] Embodiment 1: A hyperbranched urethane acrylate capable of fast UV curing, including the following components in grams by weight: 444.6 g of diisocyanate; 2000 g of polytetrahydrofuran ether glycol; 1 g of dibutyltin dilaurate; acrylic acid 185.8 g of ester; 70 g of photoinitiator; 50 g of reactive diluent; 12.2 g of crosslinking agent; 12000 g of solvent (dimethyl carbonate).

[0038] A kind of preparation method of the hyperbranched urethane acrylate of described fast UV curing is prepared according to the following steps:

[0039] Step 1), in N 2 Under the atmosphere, adjust the temperature to 70-85 °C, add isophorone diisocyanate (IPDI) and dehydrated polytetrahydrofuran ether glycol (PTMG) (in the form of M n =2000 PTMG as an example), react for 2 h to generate a linear molecular structure;

[0040] Step 2), adjust the temperature of the system to 50~60 ℃, add dimethyl carbonate (DMC) to the system as a solvent, add glycerol as a cross-linking agent for chain ex...

Embodiment 2

[0043] Embodiment 2: A hyperbranched urethane acrylate that can be quickly cured by UV comprises the following components in grams by weight: 444.6 g of diisocyanate; 2000 g of polytetrahydrofuran ether glycol; 1 g of dibutyltin dilaurate; acrylic acid 139.3 g of ester; 70 g of photoinitiator; 50 g of reactive diluent; 24.6 g of crosslinking agent; 14000 g of solvent (dimethyl carbonate).

[0044] A kind of preparation method of the hyperbranched urethane acrylate of described fast UV curing is prepared according to the following steps:

[0045] Step 1), in N 2 Under the atmosphere, adjust the temperature to 70~85 ℃, add isophorone diisocyanate (IPDI) and dehydrated polytetrahydrofuran ether glycol (PTMG) (1 mol, 2000g, to M n =2000 PTMG as an example), react for 2~3 h;

[0046] Step 2), adjust the temperature of the system to 50-60 °C, add glycerol as a cross-linking agent for chain extension, react for 1 hour, then add dibutyltin dilaurate (DBTDL) as a catalyst for reacti...

Embodiment 3

[0049] Embodiment 3: A hyperbranched urethane acrylate that can be quickly cured by UV comprises the following components in grams by weight: 444.6 g of diisocyanate; 2000 g of polytetrahydrofuran ether glycol; 1 g of dibutyltin dilaurate; acrylic acid 92.9 g of ester; 70 g of photoinitiator; 50 g of reactive diluent; 36.8 g of crosslinking agent; 16000 g of solvent (dimethyl carbonate).

[0050] A kind of preparation method of the hyperbranched urethane acrylate of described fast UV curing is prepared according to the following steps:

[0051] Step 1), in N 2 Under the atmosphere, adjust the temperature to 70-85 °C, add isophorone diisocyanate (IPDI) and dehydrated polytetrahydrofuran ether glycol (PTMG) (in the form of M n =2000 PTMG as an example), react for 2~3 h.

[0052] Step 2), adjust the temperature of the system to 50-60 °C, add glycerol as a cross-linking agent for chain extension, react for 1 hour, then add dibutyltin dilaurate (DBTDL) as a catalyst for reaction...

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Abstract

The invention relates to a rapid UV-cured hyperbranched polyurethane acrylate and a preparation method thereof, wherein the molecular weight and crosslinking density of polyurethane acrylate are improved by designing a molecular structure, and the hyperbranched polyurethane acrylate is of a net structure, excellent in mechanical property and high in photocuring rate, and comprises the following components in parts by weight: 1 to 10 parts of diisocyanate, 5 to 30 parts of polytetrahydrofuran ether glycol, 0.01 to 1 part of dibutyltin dilaurate, 0.1 to 3 parts of acrylate, 0.1 to 2 parts of a photoinitiator, 0.01 to 2 parts of an active diluent, 0.01 to 2 parts of a cross-linking agent, and 50 to 80 parts of a solvent. The rapid UV-cured hyperbranched polyurethane acrylate can be rapidly UV-cured and has excellent mechanical properties and solvent resistance, and the polyether polyol PTMG is used as a soft chain segment of the material, so that ether bonds in molecular chains are easy to rotate and are not easy to hydrolyze relative to ester bonds, and the flexibility and hydrolysis resistance of the polyurethane acrylate are enhanced.

Description

technical field [0001] The invention belongs to the technical field of photosensitive materials, and in particular relates to a method of improving the molecular weight and crosslinking density of polyurethane acrylate by designing the molecular structure, and preparing a fast UV curing method with a network structure, excellent mechanical properties and a fast photocuring rate. Hyperbranched polyurethane acrylate and preparation method thereof. Background technique [0002] At present, polyurethane acrylate materials on the market have problems such as slow photocuring rate, poor mechanical properties and weather resistance, which limit their application and development. Chinese patent CN108659192A uses hyperbranched polyether and hyperbranched polyester as the core to prepare hyperbranched polyurethane acrylate. Due to the low molecular weight of the synthesized hyperbranched polyurethane, this material has a slow UV curing rate and poor mechanical properties. Chinese pat...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/66C08G18/48C08G18/32C08G18/67C08L75/16C08J5/18B33Y70/00
CPCB33Y70/00C08G18/12C08G18/3206C08G18/4854C08G18/6677C08G18/672C08J5/18C08J2375/16
Inventor 何素芹王帅李贵勋杨勇王玉杰戴瑞欣张培刘文涛朱诚身刘浩黄淼铭
Owner ZHENGZHOU UNIV