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Moisture curable compositions and low surface energy coating compositions made therefrom

一种组合物、湿气的技术，应用在防污/水下涂料、聚脲/聚氨酯涂料、涂层等方向，能够解决不能用作不粘涂料或污垢脱附型涂料、缺乏反应性、没有形成化学键等问题

Inactive Publication Date: 2014-01-01
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lack of reactivity of this polysiloxane at the silane-terminated groups results in no chemical bond formation between the silane-terminated polyurethane and the silane-terminated polysiloxane after curing
Additionally, cured polymer blends exhibit tackiness and cannot be used as non-stick or soil release coatings

Method used

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  • Moisture curable compositions and low surface energy coating compositions made therefrom
  • Moisture curable compositions and low surface energy coating compositions made therefrom
  • Moisture curable compositions and low surface energy coating compositions made therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Load 3.4 g of Gen4 polyol NOP1 with a hydroxyl equivalent weight of 170 g / mol and 0.93 g of methanolyl-terminated PDMS (MCR-C62 with a hydroxyl equivalent weight of 2500 g / mol) into a 250 mL round bottom equipped with a mechanical stirrer flask. 5.3 grams of isocyanatopropyltriethoxysilane (IPTES, 95% purity) and 4 grams of butyl acetate (analytical grade) were added to the round bottom flask. The mixture was stirred at 75°C under nitrogen protection. 0.1% by weight of dibutyltin dilaurate (DBTDL) catalyst (analytical grade) was added. React until complete disappearance of the isocyanate functionality is confirmed by infrared analysis.

[0105] 5 grams of silane-functionalized NOP / PDMS solution (70% solids content) were mixed with 0.2 wt% p-toluenesulfonic acid. The solution was stirred for 20 minutes. Remove the thoroughly mixed solution from the mixer and let it sit for 2-5 minutes to remove most air bubbles. The above formulations were coated on aluminum panels ...

Embodiment 2

[0118]In this example, silane-terminated polyurethane and silane-terminated PDMS were synthesized separately and then blended together to obtain a moisture-curable soil release coating composition.

[0119] 3.4 grams of Gen4 polyol NOP1 was charged to a 50 mL round bottom flask equipped with a mechanical stirrer. 5.2 grams of IPTES and 3.7 grams of butyl acetate were added to the round bottom flask. The mixture was stirred at 75°C under nitrogen protection. 0.1% by weight of DBTDL catalyst was added. The reaction was continued until complete disappearance of the isocyanate functionality was confirmed by infrared analysis.

[0120] 25 g of MCR-C62 was charged into a 100 mL round bottom flask equipped with a mechanical stirrer. Add 2.6 grams of IPTES to the round bottom flask. The mixture was stirred at 75°C under nitrogen protection. 0.1% by weight of DBTDL catalyst was added. The reaction was continued until complete disappearance of the isocyanate functionality was conf...

Embodiment 3

[0123] In this example, silane-terminated polyurethane and silane-terminated PDMS were synthesized separately and then blended together to obtain a moisture-curable soil release coating component. The polyol is a polycarbonate polyol produced by Asahi Kasei Corporation. Silane-terminated PU was synthesized using isocyanatopropyltriethoxysilane (IPTES, 95% purity) or isocyanatopropyltrimethoxysilane (IPTMS, 95% purity). The catalyst used to cure the coating was 0.2% by weight p-toluenesulfonic acid, pure dibutyltin dibutoxide or pure tin dimethylhydroxyoleate.

[0124] 0.2 mol of polycarbonate polyol was added to a 50 ml round bottom flask equipped with a mechanical stirrer. Add 0.2 mol of IPTES or IPTMS to the round bottom flask. Add butyl acetate to make a 70% solids solution. The mixture was stirred at 75°C under nitrogen protection. 0.1% by weight of DBTDL catalyst was added. The reaction was continued until complete disappearance of the isocyanate functionality was co...

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Abstract

A one-package moisture curable composition is provided. The composition comprises, by weight percentage based on the dry weight of the composition, from 10 to 99% at least one silane terminated polyurethane and from 1 to 90% at least one silane terminated polysiloxane! wherein the silane terminated polyurethane based polymer has at least one end group of the general formula^ - A-(CH2)m-SiR1 n (OR2)3-n, wherein A is a urethane or urea linkage group, R1 is selected from C1-12 alkyl, alkenyl, alkoxy, aminoalkyl, aryl and (meth)acryloxyalkyl groups, R2 is each substituted or unsubstituted C1-18 alkyl or C6-C20 aryl groups, m is an integer from 1 to 60, and n is an integer from 0 to V, and wherein the silane terminated polysiloxane can be the polysiloxane based polymer with hydrolysable silane group or the reaction products of at least one organofunctional polysiloxane and at least one organofunctional silane; and wherein the composition, after moisture cured, forms a surface whose water contact angle is larger than 101°. The composition is suitable for the applications in coatings which afford low surface energy surface and improved mechanical performance, such as marine antifouling coating, anti-icing coating, anti-stain coating, self-cleaning coating, and non-sticky coating, etc.

Description

Background technique [0001] The present invention relates to a one-pack moisture curable composition forming a polyurethane-polysiloxane-siliconorganic-inorganic hybrid network, which has improved mechanical strength and excellent soil release properties. This moisture-curable composition can be easily applied in the field of coatings, especially in coating compositions with low surface energy, such as marine antifouling coatings, anti-icing coatings, antifouling coatings (anti -stain coating), self-cleaning coatings and non-stick coatings, etc. [0002] Soil-release coating compositions containing silicone elastomers have been developed to "self-clean" submerged surfaces and "shed" surface-attached fouling microorganisms. Polysiloxane formulations have many desirable properties known in the art, such as high thermal stability, anti-ultraviolet and oxidation stability, low surface energy, hydrophobicity and biocompatibility, wherein the most commonly used polysiloxane is Pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L83/04C09D175/04C09D183/04C09D5/16
CPCC09D5/1662C08L83/04C08G18/36C08G18/718C08L75/04C09D5/16C09D175/04C09D183/04C09D5/14C09D5/1675
Inventor 陈红宇黄焱李艳香约翰·罗珀三世克里斯托弗·特克杰拉尔德·范德赞德张瑜李国柱约翰·克利尔
Owner DOW GLOBAL TECH LLC
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