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High-performance water-based polyurethane dispersoid and application thereof

A water-based polyurethane and dispersion technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve problems such as yellowing, poor dyeing effect, poor water resistance, and low hardness

Active Publication Date: 2008-09-17
海聚高分子材料科技(广州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1144827C uses vegetable oil-modified polyester polyol to prepare water-based polyurethane dispersion, and obtains better water resistance and alcohol resistance, but the vegetable oil-modified water-based polyurethane coating is soft, low in hardness, yellowing and poor in dyeing effect
Patent CN1246404C reports that water-based polyurethane is prepared by polyether polyol and monohydroxy polyethylene oxide containing ring structure, which is characterized in that the ring structure is limited to aromatic rings, and the ring structure is only on the polyether segment. Water-based polyurethane is suitable for As a plastic primer, but the mass fraction of polyethylene oxide in water-based polyurethane is at least 50%, the prepared water-based polyurethane is very soft and has very low hardness, and polyethylene oxide is very easy to absorb water, resulting in very poor water resistance of water-based polyurethane
Patent CN1934152A reports the use of aromatic ring structure polyester polyol and monofunctional polyethylene oxide to prepare waterborne polyurethane, which is characterized in that the proportion of polyester polyol based on aromatic polycarboxylic acid exceeds 60%, and monofunctional polyepoxide With more than 50% ethane, water-based polyurethane exhibits good adhesion and softness. Similarly, the content of polyethylene oxide is too high, resulting in very poor hardness and water resistance of water-based polyurethane coatings
Patent CN1827690A reports the preparation of water-based polyurethane with polyester polyol containing aromatic ring structure, but the water-based polyurethane cannot form a film alone when the content of phthalic acid is high, and the water resistance is very poor, so it needs to be modified with acrylic emulsion water resistance
[0004] The existing technology has achieved certain effects in improving the performance of water-based polyurethane, but has not conducted in-depth research on the overall improvement of water-based polyurethane's water resistance, alcohol resistance, heat resistance and hardness, and has not seen related technical reports.

Method used

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  • High-performance water-based polyurethane dispersoid and application thereof

Examples

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Effect test

Embodiment 1

[0071] Embodiment 1 prepares aqueous polyurethane dispersion 1

[0072]100.0g of polyester polyol I with a molecular weight of 700 (see the summary of the invention, the following examples are the same), 11.9g of dimethylol propionic acid and 95.1g of N-methylpyrrolidone are mixed and heated to 70°C, and stirred until The dimethylolpropionic acid was completely dissolved. Then add 126.8g of isophorone diisocyanate, heat to 100°C for reaction until the -NCO content reaches 8.3%, cool down to 60°C, add 9.0g of triethylamine to neutralize the prepolymer. Then add 300.0g of water, stir vigorously to disperse the polyurethane prepolymer, at the same time slowly add 16.0g of tetraethylenepentamine and 14.6g of piperazine, and stir for another 30min until the FTIR spectrum no longer shows the absorption peak of the -NCO group , to obtain a water-based polyurethane dispersion with a solid content of 40%.

Embodiment 2

[0073] Embodiment 2 prepares aqueous polyurethane dispersion 2

[0074] Mix 90.0g of polyester polyol II with a molecular weight of 1500, 10.0g of polytetrahydrofuran ether glycol with a molecular weight of 1000, 4.8g of dimethylol propionic acid and 17.7g of N-methylpyrrolidone and heat it to 70°C, and stir until dihydroxyfuran ether diol The methacrylic acid was completely dissolved. Then add 50.0g isophorone diisocyanate and 4.3g 1,6-hexamethylene diisocyanate trimer, heat to 100°C to react until the -NCO group content reaches 6.6%, cool down to 60°C, add 5.1g triisopropylamine Neutralize the prepolymer. Then add 960g of water, stir vigorously to disperse the polyurethane prepolymer, and slowly add a mixture of 2.2g of hydrazine and 4.7g of diethylenetriamine, and stir for another 30min until the FTIR spectrum no longer shows the absorption of -NCO group peak. An aqueous polyurethane dispersion with a solid content of 15% was obtained.

Embodiment 3

[0075] Embodiment 3 prepares aqueous polyurethane dispersion 3

[0076] Mix 80.0g of polyester polyol III with a molecular weight of 1000, 20.0g of polytetrahydrofuran ether glycol with a molecular weight of 1000, 9.0g of dimethylol propionic acid and 20.3g of N-methylpyrrolidone, mix and heat to 70°C, and stir until the dimethylol Propionic acid was completely dissolved. Then add 21.3g of toluene diisocyanate, react at 70°C for 30 minutes, then add 50.5g of isophorone diisocyanate, heat to 100°C for reaction until the -NCO group content reaches 7.6%, and cool down to 60°C. Add the polyurethane prepolymer to 162.0 g of water containing 10.0 g of triethanolamine, disperse the polyurethane prepolymer under vigorous stirring, and slowly add 31.2 g of isophorone diamine, and stir for another 30 minutes until FTIR The -NCO group absorption peak is no longer shown in the spectrum. An aqueous polyurethane dispersion with a solid content of 55% was obtained.

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Abstract

The invention discloses a high-performance aqueous polyurethane dispersion, which adopts polyurethane prepolymer liquid, chain extender, neutralizer and water for preparation; the polyurethane prepolymer liquid adopts polymer polyol containing a cyclic structure with the weight percentage of 2 to 80 percent as the main raw material and polyisocyanate for preparation. The polymer polyol of the polyurethane prepolymer liquid which is prepared by screening contains 2 to 80 percent cyclic structure, the aqueous polyurethane dispersion film forming substance can not be whitened by being soaked in the water for 24 hours and being soaked in liquor with 50 degrees for 2 hours, the hardness is not lower than H, the heat-resistant temperature is not lower than 65 DEG C, the water-resistant performance, the alcohol-resistant performance, the heat-resistant performance and the hardness are completely improved, and the novel high-performance aqueous polyurethane dispersion can be used as an aqueous paint base material and a waterproof adhesive.

Description

technical field [0001] The invention belongs to the technical field of coatings and waterproof adhesives, and in particular relates to a high-performance water-based polyurethane dispersion and its application. Background technique [0002] Water-based polyurethane uses water as the dispersion medium, has the advantages of environmental protection and non-toxicity, and has good bonding performance to many substrates, and has a good application prospect in the field of coatings and adhesives. Waterborne polyurethane used as a coating substrate must have good water resistance, alcohol resistance, heat resistance and high hardness, and it must have good water resistance when used as a waterproof adhesive. [0003] Patent CN1362436A uses 1,6-hexamethylene diisocyanate, tetramethylxylylene dimethyl isocyanate and other diisocyanates to prepare water-based polyurethane, which is characterized by high bonding performance and strong mechanical strength, suitable for It is used as a...

Claims

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Application Information

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IPC IPC(8): C08G18/65C09D175/04C09D5/02C09J175/04
Inventor 邓湘华曾景艳周治明
Owner 海聚高分子材料科技(广州)有限公司
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