Polyurethane associated thickener, and preparation method and application thereof

An associative thickener and polyurethane technology, which is applied in the field of polyurethane materials to achieve the effects of low construction viscosity, enhanced association ability, and enhanced hydrophobic association ability

Inactive Publication Date: 2014-07-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, this alkyl-substituted benzyl alcohol or benzoic acid and derivatives thereof are used as end-capping agents to prepare new polyurethane thickeners.

Method used

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  • Polyurethane associated thickener, and preparation method and application thereof
  • Polyurethane associated thickener, and preparation method and application thereof
  • Polyurethane associated thickener, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 23.4g (3.9mmol) of polyethylene glycol with a molecular weight of 6000g / mol and 300mL of toluene to a 500mL four-necked round-bottomed flask equipped with mechanical stirring, water separator, condenser and nitrogen inlet, when the temperature rises to 112°C (The boiling point of toluene is 110.6°C), azeotropically remove water for 3h; then cool down to 50°C, and quickly weigh 1.73g (7.76mmol) of isophorone diisocyanate (IPDI) and 0.06g of dibutyltin dilaurate (DBTDL) , were added together into the flask, then heated to 80°C, and reacted for 3 hours. When the polyurethane prepolymerization reaction is completed, the temperature is raised to 90°C, 0.83g chain extender ethylene glycol is added, and after 2 hours of reaction, 4.5g (7.67mmol) 3,4,5-tri(decadecyloxy)benzyl alcohol is added, React for 3 hours; finally take a sample and carry out the acetone-di-n-butylamine method to measure the NCO content in the product to obtain the toluene solution of the thickener whe...

Embodiment 2

[0039] Add 44g (4.4mmol) of polyethylene glycol with a molecular weight of 10000g / mol and 350mL of toluene to a 500mL four-neck round-bottomed flask equipped with mechanical stirring, water separator, condenser and nitrogen inlet, when the temperature rises to 112 °C ( The boiling point of toluene is 110.6°C), azeotropically remove water for 3h; then cool down to 60°C, quickly weigh 1.76g (7.9mmol) isophorone diisocyanate (IPDI) and 0.072g stannous octoate, and add them together to the In the flask, the temperature was then raised to 85°C, and the reaction was carried out for 3 hours. Add 0.97g of trimethylolpropane to react for 2h after the polyurethane prepolymerization reaction is completed, then raise the temperature to 95°C, add 3.4g (5.28mmol) 3,4,5-tri(dodecyloxy)benzyl alcohol, and react 3 Hour; The toluene solution of the thickener is obtained when the NCO content in the acetone-di-n-butylamine method is determined to be less than 0.3% when the final sampling is carri...

Embodiment 3

[0049] Add 5g (0.83mmol) of polyethylene glycol with a molecular weight of 6000g / mol and 80mL of toluene to a 250mL four-necked round-bottomed flask equipped with mechanical stirring, water separator, condenser and nitrogen inlet, when the temperature rises to 112°C ( The boiling point of toluene is 110.6°C), azeotropically remove water for 3h; then cool down to 44°C, quickly weigh 0.3704g (1.67mmol) isophorone diisocyanate (IPDI) and 0.012g triethylenediamine, and add them together in a flask, then the temperature was raised to 85°C, and the reaction was carried out for 3 hours. When the polyurethane prepolymerization reaction is finished, add 0.87g glycerol to react for 2h, then raise the temperature to 100°C, add 1.38g (1.67mmol) 3,4,5‐trihexadecyloxy)benzyloxypolyoxyethylene ether, reacted for 3.5 hours; the toluene solution of the thickener was obtained when the NCO content in the acetone-di-n-butylamine method was measured at last by sampling when the product was below 0...

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Abstract

The invention discloses a polyurethane associated thickener, and a preparation method and application thereof. The preparation method comprises the following steps: adding polyether polyol and methylbenzene to a reaction container under protection of nitrogen, heating up to 110-130 DEG C, and drying and dewatering in vacuum for 2-4 hours; adding a catalyst and diisocyanate after cooling to 30-50 DEG C, heating up to 50-80 DEG C and reacting for 2-6 hours, so as to obtain a methylbenzene solution of a polyurethane prepolymer; adding a chain extender to expand the chain, reacting for 2-6 hours, and then adding a hydroxyl-containing dendric molecule capping agent; heating up to 60-100 DEG C and reacting for 2-8 hours, and then adding a precipitator petroleum ether or normal hexane; drying the sediment in vacuum to finally obtain white solid powder, namely the polyurethane associated thickener. By adopting the polyurethane associated thickener, the viscosity of an emulsion paint can be effectively improved at low dosage, so that the emulsion paint has high viscosity in a low shear state, and also has the characteristic of low construction viscosity in a high shear state; the polyurethane associated thickener has a better application prospect.

Description

technical field [0001] The invention relates to a thickener, in particular to a polyurethane associative thickener and its preparation method and application, belonging to the field of polyurethane materials. Background technique [0002] Associative thickener is an important class of rheological additives. It has excellent thickening and rheological properties due to its unique structural characteristics and thickening mechanism. It is widely used in high-grade water-based paints, cosmetic preparations, latex paints, In water-based inks, adhesives, leather, paper, printing and dyeing or varnishes. Associative thickeners are actually hydrophobically modified water-soluble polymers, mainly including hydrophobically modified polyurethane associative thickeners (HEUR), hydrophobically modified alkali-soluble or alkali-swellable emulsions (HASE) and hydrophobically modified fibers prime class (HMHEC). Due to the defects that cellulose thickeners are susceptible to microbial de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/83C08G18/48C08G18/10C08G18/24C09D7/12
CPCC08G18/10C08G18/4833C08G18/6674C08G18/6677C08G18/831C09D7/43C08G18/3206
Inventor 任碧野彭军董任峰
Owner SOUTH CHINA UNIV OF TECH
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