Low-viscosity OH prepolymer and preparing method thereof

Abstract

The invention discloses a low-viscosity OH prepolymer and a preparing method thereof. The low-viscosity OH prepolymer contains copolyester polyol, wherein the viscosity of copolyester polyol at 25 DEG C ranges from 500 mPa.s to 3000 mPa.s, the number-average molecular weight Mn ranges from 2000 to 3000, the disersity PDI ranges from 1.2 to 1.8, and the acid value is smaller than or equal to 1.5 mg / gKOH. The low-viscosity OH prepolymer overcomes the defect that due to large viscosity of an existing high molecular weight polyester polyol prepolymer, synthesis of a solvent-free polyurethane material is influenced; when the low-viscosity OH prepolymer is used for preparing solvent-free polyurethane, the dosage of a polyether polyol thinning agent can be effectively reduced, and the performance of the solvent-free polyurethane material can be improved.

Description

technical field

[0001] The application relates to a low-viscosity OH prepolymer and a preparation method thereof, belonging to the field of polyurethane material preparation. Background technique

[0002] Polyurethane materials have excellent mechanical properties, high modulus of resilience, stable chemical properties, good waterproof performance, good chemical corrosion resistance and good biocompatibility. At the same time, polyurethane materials can be changed by changing the isocyanate The structure or by changing the flexibility of the polyurethane chain segment, so as to obtain materials with different properties and uses, so it is widely used in the field of production and life.

[0003] Since the German Bayer company produced polyurethane products on a large scale in 1941, the polyurethane industry has developed rapidly. According to statistics, from 2004 to 2014, the annual growth rate of global polyurethane production capacity reached 2.5%. According to this grow...

Examples

Embodiment 1

[0067] Embodiment 1 Preparation of copolyester polyol sample A1

[0068] Add 24.33g (0.27mol) of 1,4-butanediol and 5.59g (0.09mol) of ethylene glycol into a dry three-necked flask, install a condensing device, and pass N 2 protection, the temperature was raised to 130°C, and stirring was started. Accurately weigh 43.84 g (0.3 mol) of adipic acid into the reaction flask in batches, and stir for 15 minutes until all the solids are dissolved, and the solution is colorless and transparent. At this time, install the water separator, add 0.0114g of additives triphenylphosphine and 0.0048g of tetrabutyl titanate accurately measured into the reaction bottle, then add 15-20ml of toluene, increase the N 2 Flow rate, heat preservation reaction at this temperature for 2 to 4 hours, until about 80% of water (calculated according to the amount of water generated by the complete reaction of dibasic acid in theory), at this time, toluene is evaporated; slowly heat up to 160°C , add 15~20ml...

Embodiment 2

[0073] Embodiment 2 Preparation of copolyester polyol sample A2

[0074] Add 23.64g (0.20mol) of 1,4-hexanediol, 5.59g (0.09mol) of ethylene glycol, and 7.43g (0.07mol) of diethylene glycol in a dry three-necked flask, install a condensing device, and pass N 2 protection, the temperature was raised to 140°C, and stirring was started. Accurately weigh 43.84 g (0.3 mol) of adipic acid into the reaction flask in batches, and stir for 15 minutes until all the solids are dissolved, and the solution is colorless and transparent. Install the water separator at this time, add the accurately measured 0.0116g additive triphenylphosphine and 0.0051g tetrabutyl titanate into the reaction bottle, then add 15-20ml toluene, increase the N 2 Flow rate, heat preservation reaction at this temperature for 2 to 4 hours, until about 80% of water (calculated according to the amount of water generated by the complete reaction of dibasic acid in theory), at this time, toluene is evaporated; slowly h...

Embodiment 3

[0079] Embodiment 3 Preparation of copolyester polyol sample A3

[0080] Add 31.83g (0.30mol) of diethylene glycol and 7.09g (0.06mol) of 1,4-hexanediol into a dry three-necked flask, install a condensing device, and pass N 2 protection, the temperature was raised to 130°C, and stirring was started. Accurately weigh 43.84 g (0.3 mol) of adipic acid into the reaction flask in batches, and stir for 15 minutes until all the solids are dissolved, and the solution is colorless and transparent. At this time, install the water separator, add 0.0114g of additives triphenylphosphine and 0.0048g of tetrabutyl titanate accurately measured into the reaction bottle, then add 15-20ml of toluene, increase the N 2 Flow rate, heat preservation reaction at this temperature for 2 to 4 hours, until about 80% of water (calculated according to the amount of water generated by the complete reaction of dibasic acid in theory), at this time, toluene is evaporated; slowly heat up to 160°C , add 15~20...

technical field

[0001] The application relates to a low-viscosity OH prepolymer and a preparation method thereof, belonging to the field of polyurethane material preparation. Background technique

[0002] Polyurethane materials have excellent mechanical properties, high modulus of resilience, stable chemical properties, good waterproof performance, good chemical corrosion resistance and good biocompatibility. At the same time, polyurethane materials can be changed by changing the isocyanate The structure or by changing the flexibility of the polyurethane chain segment, so as to obtain materials with different properties and uses, so it is widely used in the field of production and life.

[0003] Since the German Bayer company produced polyurethane products on a large scale in 1941, the polyurethane industry has developed rapidly. According to statistics, from 2004 to 2014, the annual growth rate of global polyurethane production capacity reached 2.5%. According to this grow...

Examples

Embodiment 1

[0067] Embodiment 1 Preparation of copolyester polyol sample A1

[0068] Add 24.33g (0.27mol) of 1,4-butanediol and 5.59g (0.09mol) of ethylene glycol into a dry three-necked flask, install a condensing device, and pass N 2 protection, the temperature was raised to 130°C, and stirring was started. Accurately weigh 43.84 g (0.3 mol) of adipic acid into the reaction flask in batches, and stir for 15 minutes until all the solids are dissolved, and the solution is colorless and transparent. At this time, install the water separator, add 0.0114g of additives triphenylphosphine and 0.0048g of tetrabutyl titanate accurately measured into the reaction bottle, then add 15-20ml of toluene, increase the N 2 Flow rate, heat preservation reaction at this temperature for 2 to 4 hours, until about 80% of water (calculated according to the amount of water generated by the complete reaction of dibasic acid in theory), at this time, toluene is evaporated; slowly heat up to 160°C , add 15~20ml...

Embodiment 2

[0073] Embodiment 2 Preparation of copolyester polyol sample A2

[0074] Add 23.64g (0.20mol) of 1,4-hexanediol, 5.59g (0.09mol) of ethylene glycol, and 7.43g (0.07mol) of diethylene glycol in a dry three-necked flask, install a condensing device, and pass N 2 protection, the temperature was raised to 140°C, and stirring was started. Accurately weigh 43.84 g (0.3 mol) of adipic acid into the reaction flask in batches, and stir for 15 minutes until all the solids are dissolved, and the solution is colorless and transparent. Install the water separator at this time, add the accurately measured 0.0116g additive triphenylphosphine and 0.0051g tetrabutyl titanate into the reaction bottle, then add 15-20ml toluene, increase the N 2 Flow rate, heat preservation reaction at this temperature for 2 to 4 hours, until about 80% of water (calculated according to the amount of water generated by the complete reaction of dibasic acid in theory), at this time, toluene is evaporated; slowly h...

Embodiment 3

[0079] Embodiment 3 Preparation of copolyester polyol sample A3

[0080] Add 31.83g (0.30mol) of diethylene glycol and 7.09g (0.06mol) of 1,4-hexanediol into a dry three-necked flask, install a condensing device, and pass N 2 protection, the temperature was raised to 130°C, and stirring was started. Accurately weigh 43.84 g (0.3 mol) of adipic acid into the reaction flask in batches, and stir for 15 minutes until all the solids are dissolved, and the solution is colorless and transparent. At this time, install the water separator, add 0.0114g of additives triphenylphosphine and 0.0048g of tetrabutyl titanate accurately measured into the reaction bottle, then add 15-20ml of toluene, increase the N 2 Flow rate, heat preservation reaction at this temperature for 2 to 4 hours, until about 80% of water (calculated according to the amount of water generated by the complete reaction of dibasic acid in theory), at this time, toluene is evaporated; slowly heat up to 160°C , add 15~20...

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