CN102391459B - Preparation method for modified polyurethane - Google Patents

Preparation method for modified polyurethane Download PDF

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CN102391459B
CN102391459B CN 201110246253 CN201110246253A CN102391459B CN 102391459 B CN102391459 B CN 102391459B CN 201110246253 CN201110246253 CN 201110246253 CN 201110246253 A CN201110246253 A CN 201110246253A CN 102391459 B CN102391459 B CN 102391459B
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CN102391459A (en
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钱华
张宁荣
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Shanxi Yubang Science And Technology Co ltd
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WUJIANG BEISHE SHENGYUAN TEXTILE AUXILIARIES FACTORY
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Abstract

The invention discloses a preparation method for modified polyurethane. The preparation method comprises the following steps of: adding polypropylene oxide glycol into a reaction vessel; heating to 75 to 80 DEG C; adding toluene diisocynate (TDI) and a T12 catalyst and reacting for 2 hours; adding dimethylol propionic acid and reacting for 30 minutes; adding hydroxyethyl acrylate and reacting for 1 hour; adding a chain extender 1,4-butanediol and reacting for 1 hour; cooling to 30 DEG C after the reaction is finished; adding a KOH solution into prepolymer with stirring at a high speed and dispersing for 20 minutes, wherein the pH value is 7 to 8; adding ethanediamine and reacting with stirring for 20 minutes; and adding deionized water under the action of high shearing force to prepare water-based polyurethane emulsion. Therefore, by the method, the breaking elongation, the moisture permeability and the air permeability of the modified polyurethane are improved effectively.

Description

The preparation method of modified polyurethane
Technical field
The present invention relates to a kind of preparation method of urethane, especially a kind of urethane preparation method who adopts the Hydroxyethyl acrylate modification.
Background technology
Top finish is a kind of novel finishing technique, and it can give fabric many specific functions, as refuses water, ventilative, thoroughly wet, windproof, anti-chiseling down, grease proofing, radioprotective and the characteristic such as fire-retardant.Can also carry out extraordinary high grade finishing to fabric.For example: single-face dyeing, sparkle effect and mixed color effect.Therefore, the top finish technology has obtained tremendous development.
The used coating-forming agent of top finish mainly contains: natural and synthetic rubber, polyvinyl chloride, silicone elastomer, polyacrylic ester, urethane etc.In fine coatings processing, mainly adopt the aftermentioned bi-material.In China, the fine coatings fabric generally uses polyacrylate(s).Because the polyacrylate coating agent coating has surface irregularity, elasticity relatively poor, the shortcoming such as split fragile under low temperature is therefore this type coating is only applicable to low and middle-grade coated fabrics.Polyurethane coating agent then has the advantages such as good wear-resisting, cold-resistant, anti-solvent and good springiness, and therefore, polyurethane coating is particularly suitable for the arrangement of garment fabric and the medium-to-high grade coated fabric of cold district.For polyurethane coating agent, generally be divided into solvent borne polyurethane coating-forming agent and water dispersant type polyaminoester coating-forming agent, the defectives such as that the solvent borne polyurethane coating-forming agent has is inflammable, poison gas, environmental pollution, thereby research in recent years mainly concentrates on the water dispersant type polyaminoester coating-forming agent.
Summary of the invention
The invention provides a kind of preparation method of modified polyurethane, it has high elongation at tear, high moisture-penetrable ventilated property, simultaneously comparatively environmental protection.
For realizing above technical purpose, the present invention will take following technical scheme:
A kind of preparation method of modified polyurethane; may further comprise the steps: at first; under nitrogen protection; in reaction vessel, add polyoxypropyleneglycol; after being warming up to 75-80 ℃; added TDI and T12 catalyst reaction 2 hours; after then adding dimethylol propionic acid reaction 30min; add Hydroxyethyl acrylate and reacted 1 hour again, add afterwards chainextender 1.4-butyleneglycol reaction 1 hour, reaction is cooled to 30 degrees centigrade after finishing; under high-speed stirring, KOH solution joined in the performed polymer and disperseed 20 minutes; this moment, the pH value was 7-8, added afterwards quadrol and continued stirring reaction 20 minutes, added deionized water again under high shearing action and made aqueous polyurethane emulsion.
When each interpolation reagent, all add simultaneously butanone.
According to above technical scheme, can realize following beneficial effect:
The present invention adopts dimethylol propionic acid that urethane is carried out modification, can effectively improve the elongation at break of this modified polyurethane, moisture-penetrable ventilated property;
The present invention adds catalyzer T12, the polymerization that can improve TDI and polyoxypropyleneglycol when the preparation performed polymer;
The present invention adopts two kinds of different chainextenders to carry out the chain extension of performed polymer, and these two kinds of chainextenders are distribute to add, and therefore, can improve the performed polymer chain extension.
The present invention all adds butanone simultaneously when each interpolation reagent, can be to reaction solution hydrotropy viscosity reduction.
It is neutralizing agent that the present invention adopts KOH solution, can avoid the pollution of adopting alkaline organic amine solvent to neutralize and cause.
Embodiment
Explain technical scheme of the present invention below with reference to embodiment.
The preparation method of modified polyurethane of the present invention, the reagent of employing has: polyoxypropyleneglycol; Tolylene diisocyanate TDI; The T12 catalyzer; Dimethylol propionic acid; Hydroxyethyl acrylate; 1.4-butyleneglycol; Quadrol; Deionized water.Specifically may further comprise the steps:
Under nitrogen protection; to being equipped with thermometer (can adopt thermopair); add polyoxypropyleneglycol in the reaction vessel of agitator (FLUKE emulsify at a high speed dispersion machine); after being warming up to 75-80 ℃; added TDI and T12 catalyst reaction 2 hours; after then adding dimethylol propionic acid reaction 30min; adding Hydroxyethyl acrylate reacted 1 hour again; chainextender 1.4-butyleneglycol reaction 1 hour; performed polymer behind the above-mentioned chain extension is cooled to 30 degrees centigrade; under the high-speed stirring of FLUKE emulsify at a high speed dispersion machine, KOH solution is joined in the performed polymer; cause the pH value to be 7-8; disperse after 20 minutes; add quadrol and continue stirring reaction after 20 minutes; under the high shearing action that FLUKE emulsify at a high speed dispersion machine provides, add deionized water and make aqueous polyurethane emulsion; in addition, add respectively a certain amount of butanone in above different steps, with to reaction solution hydrotropy viscosity reduction.
Recording the aqueous polyurethane emulsion solid content according to GB/T 1725-79 is 30%, and the content of dimethylol propionic acid is 4.87%, and particle diameter is 80-100nm, and recording the film tensile strength according to ASTM D882 standard is 28MPa, elongation at break 760%.

Claims (1)

1. the preparation method of a modified polyurethane, it is characterized in that: may further comprise the steps: at first, under nitrogen protection, in reaction vessel, add polyoxypropyleneglycol, after being warming up to 75-80 ℃, added TDI and T12 catalyst reaction 2 hours, after then adding dimethylol propionic acid reaction 30min, adding Hydroxyethyl acrylate reacted 1 hour again, add afterwards chainextender 1,4-butyleneglycol reaction 1 hour, be cooled to 30 degrees centigrade after reaction finishes, under high-speed stirring KOH solution joined in the performed polymer and disperseed 20 minutes, this moment, the pH value was 7-8, add afterwards quadrol and continued stirring reaction 20 minutes, under high shearing action, add deionized water again and make aqueous polyurethane emulsion; When adding reagent, all add simultaneously butanone each, with to reaction solution hydrotropy viscosity reduction.
CN 201110246253 2011-08-25 2011-08-25 Preparation method for modified polyurethane Active CN102391459B (en)

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Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
CN103252844B (en) * 2013-06-04 2015-03-04 中国建筑第二工程局有限公司 Foundation-free quickly-installed transition mixing station
CN105754461B (en) * 2016-03-17 2018-10-19 合众（佛山）化工有限公司 A kind of aqueous premix emulsion and its anti-pollution paint
CN106397911A (en) * 2016-08-31 2017-02-15 合肥邦立电子股份有限公司 Heat-conducting heat-resistant plastic material for vehicle-mounted charger
CN109721698B (en) * 2018-12-27 2021-03-30 传化智联股份有限公司 Hydrophilic chain extender suitable for synthesis of waterborne polyurethane and preparation method and application thereof
CN109810241B (en) * 2018-12-28 2021-04-02 郑州轻工业学院 Flexible polyurethane type amine curing agent and preparation method thereof
CN110685170B (en) * 2019-10-06 2022-06-07 武汉纺织大学 Wool keratin/waterborne polyurethane composite emulsion coating agent with warm-keeping function and preparation method thereof
CN110746571B (en) * 2019-11-19 2021-09-28 合众（佛山）化工有限公司 APAO modified polyurethane waterborne resin and preparation method thereof

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CN101747487B (en) * 2009-12-16 2012-04-18 江南大学 Preparation method of ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid
CN101845133B (en) * 2010-04-01 2011-12-28 陕西科技大学 Method for preparing natural polyhydroxy compound modified aqueous polyurethane emulsion

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