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Organosilicon water repellent compositions

A technology of polymers and copolymers, applied in other chemical processes, coatings, chemical instruments and methods, etc., which can solve problems such as lack of teaching

Inactive Publication Date: 2005-06-15
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] U.S. Patent 5,074,912 (December 24, 1991) and U.S. Patent 5,919,296 (July 6, 1999) both relate to the use of a polymethylhydrogensiloxane in the treatment of masonry, but neither of them teaches the use of Composition of various components including polymethylhydrogensiloxane, alkoxysilane and silicone resin
[0004] In addition, although U.S. Patent 5,300,327 (April 5, 1994) and U.S. Patent 5,695,551 (December 9, 1997) all relate to the purposes of a kind of alkoxysilane and silicone resin in processing masonry, but they all Compositions using various components including polymethylhydrogensiloxane, alkoxysilane and silicone resin are not taught
[0005] Additionally, none of these patents suggests that compositions for treating masonry containing such a combination of components may also contain a volatile methylsiloxane or a cationic amino-functional polydimethylsiloxane Oil-in-Water Emulsion of Silicone

Method used

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  • Organosilicon water repellent compositions
  • Organosilicon water repellent compositions
  • Organosilicon water repellent compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1 - Solvent Based Composition

[0069] A mixture was prepared containing polymethylhydrogensiloxane, silicone resin and alkoxysilane n-octyltriethoxysilane in a ratio of 8:1:1. The mixture was diluted to 20% solids in KWIK-DRY(R) 66 aliphatic dry cleaning solvent and the composition was applied to lightweight concrete bricks. Use this 20% solids mixture in accordance with ASTM Test Method E-514 to achieve a coverage of 55 sq. ft. per gallon. The properties of the composition were determined according to the NCHRP 21-day drainage test by immersing the test cube in water for 30 seconds. The properties of the compositions under these conditions are listed in Table 1.

[0070] The polymethylhydrogensiloxanes used in this and subsequent examples have a silicon-bonded hydrogen content of 1.4-1.75% by weight and a viscosity of 20-40 centistokes (mm 2 / sec) of trimethylsiloxy-terminated polymethylhydrogensiloxane.

[0071] The silicone resin used in this example an...

Embodiment 2

[0072] Example 2 - Composition in Emulsion Form

[0073]Using the emulsification method described above, an emulsion was prepared with polymethylhydrogensiloxane, silicone resin, and the alkoxysilane n-octyltriethoxysilane. These three silicone components were mixed in a weight ratio of 8:1:1. Using 40 parts by weight of these three silicone components, 13.3 parts by weight of octamethylcyclotetrasiloxane as a volatile methylsiloxane, and 0.6 parts by weight of SPAN20 nonionic surfactant with an HLB value of 8.6 Agent, the ARALTONE T nonionic surfactant with the HLB value of 1.0 parts by weight of 9.0, the G-4280 nonionic surfactant with the HLB value of 1.4 parts by weight of 19.1, that is, PEG-80 sorbitan laurate, 0.8 parts by weight of the freeze-thaw additive ethylene glycol and 42.9 parts by weight of water to prepare the emulsion. The properties of the emulsion composition are shown in Table 1 when the emulsion was diluted to a 1:1 ratio with more water and applied t...

Embodiment 3-

[0074] Example 3 - Another composition in the form of an emulsion

[0075] Except for the addition of 2.2 parts by weight of cationic amino-functional polydimethylsiloxane containing reactive silanol functional groups stabilized by cationic and nonionic surfactants to the diluted emulsion of Example 2. Apart from the emulsion, a second emulsion was prepared according to the method used in Example 2. The properties of the emulsion composition are shown in Table 1.

[0076] Embodiment 4-comparative example

[0077] A solution containing 20% ​​by weight n-octyltriethoxysilane was prepared in isopropanol using a titanate catalyst. The composition is applied to lightweight concrete blocks. This composition was used in accordance with ASTM Test Method E-514 to achieve a coverage of 55 square feet per gallon. The properties of the composition were determined according to the NCHRP 21-day drainage test method by immersing the test cube in water for 30 seconds. The properties ...

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Abstract

A composition that renders a surface repellent to water by adding water or a solvent; a methylhydrogensiloxane polymer or copolymer; formula R a Si(OR’) 4-a Alkoxysilane (where R represents an alkyl group containing 1-10 carbon atoms, an alkenyl group containing 2-8 carbon atoms, an aryl group or a haloalkyl group, a is 1 or 2, and R' represents a group containing 1 -Alkyl group with 6 carbon atoms); formed by mixing with silicone resin. The compositions may also contain other ingredients such as volatile methylsiloxanes, oil-in-water emulsions of cationic amino-functional polydimethylsiloxanes, surfactants, catalysts, beading agents, organic Waxes, preservatives, defoamers, fungicides, UV absorbers / UV stabilizers or freeze-thaw additives.

Description

technical field [0001] The present invention relates to a silicone composition which can be used as a water repellent for the surface of mineral substrates used in the construction industry. Representative mineral substrates are building materials such as bricks, cured concrete, downpipes, hollow bricks, cured stucco, stucco, decorative stone, roof tiles and the surfaces of structures incorporating such building materials, i.e. highways , bridges, concrete, stone or brick building exteriors, footings and retaining walls. [0002] Silicone compositions can also be used to prepare castable or trowelable mineral compositions such as uncured cement, as compositions for use on wood substrates, especially as compositions for use on exterior surfaces of residential wood trim panels . The compositions of the present invention can also be used in the production of gypsum wall panels, whether incorporated into uncured formulations or applied to the surface of gypsum wall panels, inorg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C04B41/49C09K3/18C08K5/5415C08L83/05
CPCC04B41/009C04B41/4961C09D183/04C04B41/4922C04B28/02C08L83/00C08L2666/44
Inventor P·菲舍尔F·林L·斯塔克-卡斯雷
Owner DOW CORNING CORP
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