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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Problems solved by technology

The above methods are cumbersome, the product preparation cost is hig...

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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.

Technology Topic

IsocyanatePolyester +8

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Experimental program(5)

Example Embodiment

[0019] Example 1

[0020] The aggregation steps are as follows:

[0021] 1. Preparation of polyester resin prepolymer:

[0022] Propylene glycol was added, the temperature was raised to 80° C., and isophthalic acid was added (the molar ratio of dihydric alcohol and saturated dibasic acid was 1-1.05:1). The temperature was raised to 150 °C within 1 h, and then increased to 210 °C at a heating rate of 10 °C/h. Condensation polymerization was carried out at 180°C for 3 hours under nitrogen, and when the acid value was less than 20 mgKOH/g, the temperature was lowered to 180°C.

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

[0024] Add 0.1 mole of hydroxyl-terminated polybutadiene with a molecular weight of 1200, 1.2 moles of diethylene glycol, and 1 mole of maleic anhydride (hydroxyl-terminated flexible macromolecular diol: moles of diol and unsaturated dibasic acid) The ratio is 0.1:1.2:1). The temperature was raised to 210°C at a heating rate of 10°C/h, and the hydroxyl-terminated polybutadiene and unsaturated polyester resin were copolymerized by polycondensation to form a block copolymer. vacuum. When the acid value is less than 10mgKOH/g, the temperature is lowered and cooled.

[0025] 3. Curing of flexible unsaturated polyester glycol modified polyurethane/unsaturated polyester resin:

[0026] Add 1 mole of flexible unsaturated polyester diol synthesized in 2 to 1.02 moles of toluene diisocyanate, slowly dropwise and stir at 50 °C and mix, and finally add 50% flexible unsaturated polyester diol mass ratio diluent styrene. Finally, the modified polyurethane/unsaturated polyester resin is prepared. The modified polyurethane/unsaturated polyester resin was added with a triethylenediamine catalyst with a mass dosage of 1.00% resin and a dibenzoyl peroxide curing agent with a mass dosage of 1.50% resin. After foaming, the bubbles and moisture were removed and added to the mold. Room temperature curing molding.

Example Embodiment

[0027] Example 2

[0028] The aggregation steps are as follows:

[0029] 1. Preparation of polyester resin prepolymer:

[0030] 1.03 moles of propylene glycol was added, the temperature was raised to 80° C., and 1 mole of terephthalic acid was added (the molar ratio of dihydric alcohol and saturated dibasic acid was 1.03:1). The temperature was raised to 150 °C within 1 h, and then increased to 210 °C at a heating rate of 10 °C/h. Condensation polymerization was carried out at 180°C for 3 hours under nitrogen, and when the acid value was less than 20 mgKOH/g, the temperature was lowered to 180°C.

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

[0032] Add 0.2 moles of hydroxy-terminated styrene-butadiene liquid rubber with a molecular weight of 2000 again, 1.5 moles of diethylene glycol, and 1 mole of maleic anhydride (hydroxyl-terminated flexible macromolecular diols: moles of diols and unsaturated dibasic acids) The ratio is 0.2:1.5:1). The temperature was raised to 210°C at a heating rate of 10°C/h, and the hydroxy-terminated styrene-butadiene liquid rubber and the unsaturated polyester resin were copolymerized by polycondensation to form a block copolymer. vacuum. When the acid value is less than 10mgKOH/g, the temperature is lowered and cooled.

[0033] 3. Curing of flexible unsaturated polyester glycol modified polyurethane/unsaturated polyester resin:

[0034] Add 1 mole of flexible unsaturated polyester diol synthesized in 2 to 1.05 moles of diphenylmethane diisocyanate, slowly add dropwise stirring at 50°C and mix, and finally add 40% flexible unsaturated polyester diol mass ratio diluent Styrene. Finally, the modified polyurethane/unsaturated polyester resin is prepared. Modified polyurethane/unsaturated polyester resin was added with dibutyltin dilaurate catalyst with a resin mass dosage of 1.00%, and a dibenzoyl peroxide curing agent with a resin mass dosage of 1.50%. After foaming, the bubbles and moisture were removed, and then added to the mold 80 ℃ curing molding.

Example Embodiment

[0035] Example 3

[0036] The aggregation steps are as follows:

[0037] 1. Preparation of polyester resin prepolymer:

[0038] 1.05 moles of butanediol was added, the temperature was raised to 80° C., and 1 mole of phthalic anhydride was added (the molar ratio of glycol and saturated dibasic acid was 1.05:1). The temperature was raised to 150 °C within 1 h, and then increased to 210 °C at a heating rate of 10 °C/h. Condensation polymerization was carried out at 180°C for 3 hours under nitrogen, and when the acid value was less than 20 mgKOH/g, the temperature was lowered to 180°C.

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

[0040]Add 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 (hydroxyl-terminated flexible macromolecular diol: diol and unsaturated dibasic acid) The molar ratio was 0.15:1.4:1). The temperature was raised to 210°C at a heating rate of 10°C/h, and the hydroxyl-terminated hydrogenated polybutadiene and unsaturated polyester resin were copolymerized by polycondensation to form a block copolymer. When the acid value was less than 30mgKOH/g, the temperature was increased to 180°C Vacuum. When the acid value is less than 10mgKOH/g, the temperature is lowered and cooled.

[0041] 3. Curing of flexible unsaturated polyester glycol modified polyurethane/unsaturated polyester resin:

[0042] Add 1 mole of flexible unsaturated polyester diol synthesized in 2 to 1.02 moles of toluene diisocyanate, slowly dropwise and stir at 50°C, and finally add 40% flexible unsaturated polyester diol mass ratio diluent methacrylic acid methyl ester. Finally, the modified polyurethane/unsaturated polyester resin is prepared. Modified polyurethane/unsaturated polyester resin is added with dibutyltin dilaurate catalyst with a resin mass dosage of 1.00%, dibenzoyl peroxide with a resin mass dosage of 1.50%, and N,N-dimethylaniline with a resin mass dosage of 1% , after foaming, remove air bubbles and moisture, and add it to the mold to cure at room temperature.

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Modified polyurethane/unsaturated polyester resin dibasic alcohol preparation method

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