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Modified polyurethane/unsaturated polyester resin dibasic alcohol preparation method

A technology of polyester diol and polyester resin is applied in the field of preparation of flexible unsaturated polyester diol, which can solve the problems of high preparation cost, complicated operation and cumbersome operation, and achieve excellent product performance and controllable curing process. Effect

Active Publication Date: 2014-03-26
CHANGZHOU XIAOGUO INFORMATION SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are cumbersome, the product preparation cost is high, the operation is complicated, and there are compatibility problems

Method used

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  • Modified polyurethane/unsaturated polyester resin dibasic alcohol preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The aggregation steps are as follows:

[0021] 1. Preparation of polyester resin prepolymer:

[0022] Add propylene glycol and raise the temperature to 80°C; add isophthalic acid (the molar ratio of glycol to saturated dibasic acid is 1-1.05:1). Raise the temperature to 150°C within 1 hour, and then raise the temperature to 210°C at a heating rate of 10°C / h. Condensate and polymerize at 180°C for 3 hours under nitrogen gas, and cool down to 180°C when the acid value is less than 20mgKOH / g.

[0023] 2. Preparation of flexible unsaturated polyester diol:

[0024] Add again 0.1 moles of hydroxyl-terminated polybutadiene with a molecular weight of 1200, 1.2 moles of diethylene glycol, and 1 mole of maleic anhydride (the flexible macromolecular diol of the hydroxyl group: the mole of dibasic alcohol and unsaturated dibasic acid The ratio is 0.1:1.2:1). Raise the temperature to 210°C at a heating rate of 10°C / h, and use polycondensation to copolymerize hydroxyl-terminated...

Embodiment 2

[0028] The aggregation steps are as follows:

[0029] 1. Preparation of polyester resin prepolymer:

[0030] Add 1.03 moles of propylene glycol and raise the temperature to 80°C; add 1 mole of terephthalic acid (the molar ratio of glycol to saturated dibasic acid is 1.03:1). Raise the temperature to 150°C within 1 hour, and then raise the temperature to 210°C at a heating rate of 10°C / h. Condensate and polymerize at 180°C for 3 hours under nitrogen gas, and cool down to 180°C when the acid value is less than 20mgKOH / g.

[0031] 2. Preparation of flexible unsaturated polyester diol:

[0032] Add again 0.2 moles of hydroxyl-terminated styrene-butadiene liquid rubber with a molecular weight of 2000, 1.5 moles of diethylene glycol, and 1 mole of maleic anhydride (the flexible macromolecular diol of the hydroxyl group: the mole of dibasic alcohol and unsaturated dibasic acid The ratio is 0.2:1.5:1). Raise the temperature to 210°C at a heating rate of 10°C / h, and use polycondens...

Embodiment 3

[0036] The aggregation steps are as follows:

[0037] 1. Preparation of polyester resin prepolymer:

[0038] Add 1.05 moles of butanediol and raise the temperature to 80°C; add 1 mole of phthalic anhydride (the molar ratio of dihydric alcohol to saturated dibasic acid is 1.05:1). Raise the temperature to 150°C within 1 hour, and then raise the temperature to 210°C at a heating rate of 10°C / h. Condensate and polymerize at 180°C for 3 hours under nitrogen gas, and cool down to 180°C when the acid value is less than 20mgKOH / g.

[0039] 2. Preparation of flexible unsaturated polyester diol:

[0040]Add again 0.15 moles of hydroxyl-terminated hydrogenated polybutadiene with a molecular weight of 1500, 1.4 moles of diethylene glycol, and 1 mole of maleic anhydride (the hydroxyl-terminated flexible macromolecular diol: dibasic alcohol and unsaturated dibasic acid) The molar ratio is 0.15:1.4:1). Raise the temperature to 210°C at a heating rate of 10°C / h, and use polycondensation ...

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Abstract

The invention relates to a modified polyurethane / unsaturated polyester resin dibasic alcohol preparation method belonging to the field of high molecular polymerization. By synthesizing flexible unsaturated polyester dibasic alcohol through multi-step polymerization, the flexible group proportion and the hydroxyl value are controllable; a flexible unsaturated polyester dibasic alcohol, isocyanate and diluter blending method is easy to implement in the production process; the curing process is controllable, and room-temperature curing can be realized; and modified polyurethane / unsaturated polyester resin cured products are excellent in performance. The invention can be widely used in industrial, agricultural and transportation occasions as well as some occasions of special applications.

Description

Technical field: [0001] The invention belongs to the field of macromolecular polymerization, and in particular relates to a method for preparing flexible unsaturated polyester diol using a modified polyurethane / unsaturated polyester resin. Background technique: [0002] Unsaturated polyester resin (UPR) has excellent comprehensive properties and is widely used. It is one of the fastest-growing varieties of thermosetting resins in recent years. However, UPR has the disadvantage of high brittleness, which limits its application range. Improving the toughness of UPR is an important issue. The liquid rubber block is used to improve the fracture performance of UPR. Although this method improves the toughness of UPR, it has a negative impact on its heat resistance, and the process performance of UPR is affected due to the increase of viscosity. Through molecular design, adjusting the flexibility of molecular chains can also achieve the purpose of toughening UPR resin, but it wil...

Claims

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Application Information

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IPC IPC(8): C08G18/68C08G63/676C08G63/685C08F283/00
CPCC08G18/683C08G63/676C08G63/6858
Inventor 张震乾吉祥王佩何剑虹
Owner CHANGZHOU XIAOGUO INFORMATION SERVICES
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