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Aqueous hydrophobic silica dispersions

A technology of silica and pyrolytic silica, which is applied in the direction of silica, silica, and liquid-repellent fibers, can solve the problems that are not conducive to the final properties and hinder dispersion, so as to improve the matting performance and increase the Choose and realize the effect of cost

Active Publication Date: 2020-09-11
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such dispersants can interfere with the dispersion of the hydrophilic silica component of the coating or dispersion or can be detrimental to the final properties of coatings or other articles prepared with the dispersion

Method used

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  • Aqueous hydrophobic silica dispersions
  • Aqueous hydrophobic silica dispersions
  • Aqueous hydrophobic silica dispersions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] Polyurethane-acrylic dispersions were prepared and investigated for dispersion properties such as viscosity, as well as gloss and other properties of cured products.

[0176] The matting agent is provided via the aqueous hydrophobic silica dispersions I and II. The starting materials for the two aqueous hydrophobic silica dispersions were PG 022 dispersion.

[0177] These two aqueous hydrophobic silica dispersions contain MT1100 translucent airgel. In addition to this airgel, Dispersion II also contains 95 micronized precipitated silica.

[0178] Details on the procedure followed in preparing Dispersions I and II are presented in Table 2 below.

[0179] Table 2

[0180]

[0181]

[0182] Dispersions I and II were added to polyurethane-acrylic compositions (NeoPac TM R-9699 water-based urethane / acrylic copolymer) to form compositions I and II:

[0183] table 3

[0184]

[0185] As indicated in Table C (Example 1), additional ingredients were added to...

Embodiment 2

[0197] Starting from the same base dispersion as described in Example 1, namely the CAB-O-SPERSE PG 022 dispersion, the following aqueous hydrophobic silica dispersions I, II and III were prepared. These three kinds of preparations comprise respectively: (I) MT1100 airgel; (II) same A combination of MT1100 airgel and Zeothix 95 precipitated silica; and (III) Combination of MT1100 airgel and S363 micronized wax material. The programs used are shown in Table 7.

[0198] Table 7

[0199]

[0200]

Embodiment 3

[0203] Dispersions I, II, and III prepared in Example 2 above were mixed with a polyurethane system (NeoRez TM R-960 water-based urethane) were used together to prepare several coating compositions. The labels "low" and "high" refer to the selected relative loadings.

[0204] The procedure followed to prepare the control coating composition and the experimental urethane-based coating composition is detailed in Table 8. Grind fineness is indicated using the Hegman fineness method as described above.

[0205] Table 8

[0206]

[0207]

[0208] a: NeoRez with 34% solid loading TM R-960 water-based urethane.

[0209] The pH and viscosity values ​​observed for the various coating compositions are shown in Table 9 below.

[0210] Table 9

[0211] A B C D E F G control I-Low I-High II-Low II-High III-Low III-High pH 8.10 8.20 8.40 8.50 8.40 8.50 8.60 viscosity 125.00 118.00 129 128 136 132 136

[0212] Test ...

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Abstract

An aqueous hydrophobic silica dispersion includes a hydrophilic particulate silica, a hydrophobic particulate silica having a methanol number of at least 60, and a dispersant having at least one cationic or cationizable group and an HLB ratio of 2 to 20.

Description

[0001] This application claims priority to U.S. Provisional Application No. 62 / 621,684, filed January 25, 2018, which is hereby incorporated by reference in its entirety. Background technique [0002] Coatings are used to impart a wide variety of properties to rigid and flexible substrates of many compositions. Corrosion and scratch protection, thermal and electrical insulation, and improved aesthetics are just a few examples of the wide range of coating applications. [0003] As the coatings industry develops, the goals and requirements are becoming more stringent. For example, it is important to reduce emissions of volatile organic compounds (VOC), with particular emphasis on indoor and building use. Industrial applications are targeting improvements in corrosion resistance and other protective characteristics to optimize maintenance cycle times. [0004] An important consideration when coating smooth surfaces is the degree of gloss imparted. In some instances, the glare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/42C09D175/14C08K9/06
CPCB01J20/103B01D53/02B01J20/28047B01J20/28016B01J20/28011C09D7/42C09D175/14B01D2257/708B01D2258/06C08K3/36C09D133/04C09D175/04C01B33/12C08K2201/006C09D7/61C08G18/6225C04B40/0039C04B14/064C04B14/066C04B22/062C09D7/70C01B33/1417C01P2006/10C01P2006/12C01P2006/82D06M11/79D06M2200/12
Inventor 桂张良L.H.阮K.K.佩S.雅各布斯T.刘M.J.莫内洛A.M.桑切斯加西亚T.梅原
Owner CABOT CORP
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