CN101376791B - Organosilicon coating and preparation thereof - Google Patents
Organosilicon coating and preparation thereof Download PDFInfo
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Abstract
The invention discloses an organic silicon dope which comprises an organic silicon resin, paints and a solvent; wherein, the dope also comprises a crosslinking agent for crosslinking the organic silicon resin as well as polyester and isocyanate. The invention also discloses a preparation method of the organic silicon dope. The organic silicon dope provided by the invention can be used to improve the wear resistance of a solid silicon rubber parent metal coated with the organic silicon dope.
Description
Technical field
The present invention relates to a kind of organosilicon coating, also relate to the preparation method of this organosilicon coating.
Background technology
Because firm silicone rubber has excellent flame-retardant performance, insulativity, hydrophobic nature, chemical proofing and thermostability, and under hot environment, still can keep good elasticity, and therefore with low cost, safety and environmental protection is extensive use of in the injection moulding of low-end mobile phone market cell phone keyboard.And the technology that employing silicon rubber is made cell phone keyboard is very simple, and moulding is convenient rapidly.
But because the bad mechanical strength of firm silicone rubber, the utmost point is not wear-resistant, and the wear resisting property that therefore need improve firm silicone rubber reduces the wearing and tearing in user's use to prolong the life cycle of mobile phone.Can adopt the method for sprayed coating to improve the wear resistance of firm silicone rubber cell phone keyboard.And, adopt organosilicon coating just can make the consistency of firm silicone rubber base material and coating better, thereby obtain good tack for the firm silicone rubber base material.
CN1919948A discloses a kind of nanometer SiO
2-organosilicon coating, by weight percentage, composed as follows: silicone resin, 60-82%; Nanometer SiO
2, 3-10%; Dimethylbenzene, 5-15%; Toluene, 3-8%; N-BUTYL ACETATE, 3-6%; Dispersion agent, 0.2-0.6%; Flow agent, 0.1-0.3%; Defoamer, 0.2-0.4%; Talcum powder, 3-10%.This organosilicon coating is used to improve space material opposing atomic oxygen erosion ability, has good intensity, toughness and stability, can also ultraviolet-resistant aging.But the wear resistance of this coating is relatively poor.
Summary of the invention
The objective of the invention is to overcome the relatively poor defective of organosilicon coating wear resistance of above-mentioned prior art, a kind of wear resistance organosilicon coating preferably is provided, and the preparation method of this organosilicon coating.
The invention provides a kind of organosilicon coating, this coating contains silicone resin, pigment and solvent, and wherein, described coating also contains the linking agent that silicone resin is crosslinked, polyester and isocyanic ester.
The present invention also provides a kind of preparation method of organosilicon coating, this method comprises silicone resin, pigment and solvent even, obtain mixture, wherein, in described mixture, also add the linking agent that silicone resin is crosslinked, polyester and isocyanic ester.
According to organosilicon coating provided by the invention, owing to also contain polyester and isocyanic ester, when the hot setting of organic silicon coating spraying back, polyester and isocyanate reaction form urethane, because the wear resistance of urethane is fine, thereby improved the wear resistance of organosilicon coating.Therefore, the wear resistance of the firm silicone rubber base material that has applied organosilicon coating is improved a lot.
Embodiment
Organosilicon coating provided by the invention contains silicone resin, pigment and solvent, and wherein, described coating also contains the linking agent that silicone resin is crosslinked, polyester and isocyanic ester.
According to organosilicon coating provided by the invention, in the preferred case, based on described coating gross weight, the content of described silicone resin is 30-45 weight %, the content of described pigment is 10-30 weight %, and the content of described linking agent is 3-4 weight %, and the content of described solvent is 30-40 weight %, the content of described polyester is 4-6%, and the content of described isocyanic ester is 2-4 weight %.
According to organosilicon coating provided by the invention, the liquid silicone resin that contains vinyl is the silicone resin that contains vinyl, and viscosity is 100000-150000mPas, and density is 1.10-1.20g/cm
3, the spendable example that contains the liquid silicone resin of vinyl comprises poly-ethylene methacrylic radical siloxane, phenyl polyvinyl siloxane, vinyldimethicone and polydiene base tetramethyl-silica alkane.The liquid silicone resin that contains vinyl can be commercially available, for example the TSE-3221 of Japanese Toshiba.
According to organosilicon coating provided by the invention, linking agent can use with the liquid silicone resin reaction that contains vinyl and be cross-linked into cancellated various linking agent, the polymethyl hydrogen siloxane of side chain band Si-H key for example, the polymethyl hydrogen siloxane of end group band Si-H key, perhaps side chain, end group all have the polymethyl hydrogen siloxane that has the Si-H key, and it can be heated to 180-240 ℃ of crosslinking reaction with the liquid silicone resin that contains vinyl and form reticulated structure in the presence of platinum catalyst.The preferred 100-200 of the number-average molecular weight of this polymethyl hydrogen siloxane.Polymethyl hydrogen siloxane can be commercially available, for example the SH-TM of the CAT-TM of Japanese SHIN-ETSU HANTOTAI and emblem, Hunan, Dongguan.
According to organosilicon coating provided by the invention, described pigment optimization uses the silica gel toner, and the silica gel toner can be commercially available, the silica gel toner of for example good promise in Dongguan, emblem, Hunan (good promise 135, the emblem, Hunan is black, the emblem, Hunan is white).
Employed pigment is generally mill base in the conventional coating, but in organosilicon coating, because surface of silicone resin tension force is low, the solubility parameter of its solubility parameter and mill base differs greatly, thereby silicone resin and mill base consistency are poor, that mill base is difficult to is wetting, disperse silicone resin, make to adopt mill base as the opacifying power of the painted difficulty of the organosilicon coating of pigment, color a little less than, because it is compatible bad, can't overcome internal stress and surface imperfection on the base material, it is poor to make sprawling of substrate surface, can not obtain smooth slick paint film.
And silica gel toner and matrix resin silicone resin polarity are approaching, thereby consistency is fine, and it is more high temperature resistant than common mill base, therefore adopt the pigment of silica gel toner as organosilicon coating, can make this coating have good tinting strength, opacifying power, and can overcome internal stress and surface imperfection on the base material, make that the coating spreadability is good, can access smooth slick paint film.And, owing to adopt the pigment of silica gel toner as organosilicon coating, solved compatibility problem, can make the anti-laser engraving of paint film, that is, after having sprayed coating formation paint film of the present invention, through laser engraving, can obtain character pattern clearly, and with the still clear no vestige of alcohol wipe.
According to organosilicon coating provided by the invention, because not high as the main segment bond energy of the liquid silicone resin of coating matrix resin, paint film is softer, the feasible paint film that forms by the coating that only contains the liquid silicone resin, and scratch-resistant performance is relatively poor.Thereby; in coating of the present invention, contain polyester and isocyanic ester; when the coating after will spraying is heating and curing; polyester and isocyanic ester can react formation urethane; can form acyclic and cyclic hydrogen bond between polyurethane molecular; do the time spent being subjected to external force; hydrogen bond absorbs energy; thereby protected covalent linkage; can form hydrogen bond again again when removing external force; so cracking repeatedly, compound makes polyurethane coating film have high degree of mechanical wear resistance and toughness, thereby can improve the wear resisting property of whole coating.
According to organosilicon coating provided by the invention, the selection of described polyester and isocyanic ester generates urethane as long as they can be reacted under the situation of heating, for example polyester can be the saturated hydroxy polyester, hydroxyl value is 75-95mgKOH/g, and number-average molecular weight is 3000-3500.The example of saturated polyester can comprise MALEIC ANHYDRIDE and/or Tetra hydro Phthalic anhydride and/or isophthalic anhydride and the prepared polyester of propylene glycol, or terephthalic acid and the prepared polyphenyl dioctyl phthalate glycol ester (PET) of ethylene glycol, the perhaps prepared polyphenyl dioctyl phthalate butanediol ester (PBT) of terephthalic acid and butanediol ester.
According to organosilicon coating provided by the invention, under the preferable case, the number-average molecular weight of described isocyanic ester is 580-690, described isocyanic ester is preferably case type isocyanic ester, so-called masked isocyanate is meant with encapsulant isocyanate groups (NCO) is carried out end capped isocyanic ester, can solve isocyanate groups reaction activity height by isocyanate groups being carried out end-blocking, to moisture-sensitive (NCO can react with water), stability in storage is better, and free isocyanate is harmful, more can compliance with environmental protection requirements after the sealing.Everyly in theory can both be used as the Blocking of Isocyanates agent with the material of active hydrogen reaction on the isocyanic ester, and because our silicone resin and polymethyl hydrogen siloxane (containing hydrogen silicone oil) temperature of reaction are higher, we require the deblocking temperature higher, and at the room temperature quite stable, but deblocking rapidly under the deblocking temperature, commonly used have phenols (phenol, 170-180 ℃ of deblocking temperature), alcohols (deblocking temperature 〉=180 ℃), lactan (140-180 ℃ of deblocking temperature), an oximes (about 140 ℃) etc.The example of isocyanic ester comprises that aromatic isocyanate such as tolylene diisocyanate (TDI), aliphatic isocyanates such as hexamethylene diisocyanate (HDI), araliphatic isocyanic ester (being connected with a methylene radical between phenyl ring and isocyanic ester) are as xylylene diisocyanate.Because the aliphatic isocyanates yellowing resistance is best in the above-mentioned isocyanic ester, preferred isophorone diisocyanate wherein, its reactivity ratio HDI is low, and the light stability effect is better.So preferably adopt the dead front type isophorone diisocyanate.
According to organosilicon coating provided by the invention, described solvent can in various and the coating as the good all kinds of SOLVENTS of liquid silicone resin compatible that contains vinyl of matrix resin, preferably use aviation kerosene.
According to organosilicon coating provided by the invention, under the preferable case, described coating also contains dispersion agent, increases in hard agent and the inhibitor one or more.
According to organosilicon coating provided by the invention, under the preferable case, based on described coating gross weight, the content of described dispersion agent is 2-5 weight %, and the described content that increases hard agent is 3-15 weight %, and the content of described inhibitor is 0.8-1 weight %;
According to organosilicon coating provided by the invention, adopt dispersion agent can promote the moistening and homodisperse of each composition in the coating.Dispersion agent can be selected any dispersion agent that is used for organosilicon coating for use, and the example of available dispersion agent comprises ultra-high molecular weight dispersion agent or cationic dispersing agent.Ultra-high molecular weight dispersion agent and cationic dispersing agent are conventionally known to one of skill in the art, for example, described ultra-high molecular weight dispersion agent is by the synthetic supra polymer polymkeric substance of block copolymerization with oleophylic and hydrophilic compound, such dispersion agent has the absorbed portion of pigment and the expandable part in solvent, the absorption firmness is strong, adsorbent layer thickness is big, thereby has a good space steric effect, can guarantee the stability of brushing-on color dispersions system, reach and prevent that the pigment loose colour from growing dim, sedimentary purpose, therefore, preferably adopt the ultra-high molecular weight dispersion agent.The ultra-high molecular weight dispersion agent that is purchased can be selected the BYK-163 of 4010 and Bi Ke of Dutch dust husband Kona for use, and the cationic dispersing agent that is purchased can be selected the BYK-110 of Bi Ke for use.
According to organosilicon coating provided by the invention, adopt to increase the wear resisting property that hard agent can further improve coating of the present invention.Under the preferable case, the described Mohs' hardness that increases hard agent is 3-10Mohs, and particle diameter is the 20-80 millimicron.Describedly increase hard agent and can be the various hard agent that increase that are used for coating with the wear resisting property that improves coating, this example that increases hard agent comprises one or more in aluminum oxide powder, ultrafine silica powder, silica powder, ceramics powder, silicate powder, the polymethylmethacrylate powder; Wherein ultrafine silica powder is preferably aerosil (being gas-phase silica), and aerosil can be commercially available, for example the aerosil of U.S. Cabot, German Degussa.
According to organosilicon coating provided by the invention, adopt inhibitor can suitably slow down the curing reaction of silicone resin, make its stability in storage better, prolong the execution of coating time limit simultaneously.Described inhibitor can use the various inhibitor that are used to slow down paint solidification, for example alkynol compounds, ethene siloxanes, superoxide or contain the organism of elements such as N, P, S perhaps contain the ionic compound of Sn, Pb, Hg, Bi, As heavy metal.Inhibitor can be commercially available, for example the SH-801 of the TR-023 of the KW-886 of the wide common vetch in Taiwan, the good promise in Dongguan and ME-75 and emblem, Hunan, Dongguan.
The preparation method of organosilicon coating provided by the invention comprises, silicone resin, pigment and solvent is even, obtains mixture, wherein, also adds the linking agent that silicone resin is crosslinked, polyester and isocyanic ester and mix in described mixture.
Preparation in accordance with the present invention, in the preferred case, gross weight based on described coating, the consumption of described silicone resin is 30-45 weight %, the consumption of described pigment is 10-30 weight %, and the consumption of described linking agent is 3-4 weight %, and the consumption of described solvent is 30-40 weight %, the consumption of described polyester is 4-6%, and the consumption of described isocyanic ester is 2-4 weight %.Each composition selects for use as mentioned above in the described coating.
Preparation in accordance with the present invention in the preferred case, also adds dispersion agent in described mixture, increase in hard agent and the inhibitor one or more.
Preparation in accordance with the present invention, in the preferred case, based on described coating gross weight, the content of described dispersion agent is 2-5 weight %, and the described content that increases hard agent is 3-15 weight %, and the content of described inhibitor is 0.8-1 weight %.Selecting for use as mentioned above of described each composition.
According to preparation method provided by the invention, for each composition is mixed better, more equably, in the preferred case, at first by above-mentioned content, with aviation kerosene and dispersant, dispersed with stirring 20-30 minute, add the silica gel toner again, stir, reach pre-dispersed effect, add silicone resin, linking agent, polyester, isocyanic ester, inhibitor then and increase hard agent and mix, mixture is added three-roller together grind, and be ground to below 10 microns.
The coating made according to the method described above need-10 ℃ down refrigeration store, take out from refrigerator-freezer before using and leave standstill, treat identical with the environment for use temperature after uncork again.
When sprayed coating, adding with proportioning in coating is the mixed diluent of 1: 1: 2 dimethylbenzene, toluene and aviation kerosene, the spray viscosity that furnishing is fit to, the platinum catalyst that adds the 1-2% of coating total amount then, can spray, spray to and in baking oven, be heated to later 180-240 ℃ of baking-curing on the base material.Paint film after the paint solidification film forming has good wear resistance and anti-laser engraving, and the glossiness height, the color strong covering power, thus reach the manufacturing technique requirent of silicon rubber base material cell phone keyboard.Employed platinum catalyst can be commercially available, for example the SHPL-4 of the PL-3 of the PL-4 of the wide common vetch in Taiwan, the good promise in Dongguan and emblem, Hunan, Dongguan.
Adopt the mode of specific embodiment that the present invention is explained in further detail below.
Embodiment 1
64g black slurry (the peaceful 9007-V of section) is added mixing and stirring in the 120g aviation kerosene.
Add silicone resin (Japanese Toshiba then, model TSE-3221) 180g, polymethyl hydrogen siloxane (Japanese SHIN-ETSU HANTOTAI, model C AT-TM) 12.6g, saturated polyester D-57-80 (upright big resin) 16g, with dead front type isophorone diisocyanate Z4470BA (Baeyer) 8g, put into three-roller (Jiangyin City, Jiangsu Province diligent industry chemical machinery company limited together, model 645) grinds in and mix, adjust three-roller roller spacing to being fit to size, the granularity that is ground to coating is promptly to obtain organosilicon coating below 10 microns.
When spraying this organosilicon coating of making, get this coating of 100g, adding proportioning is the mixed diluent 400-500g of 1: 1: 2 dimethylbenzene, toluene and aviation kerosene, and the spray viscosity that furnishing is suitable adds platinum catalyst 5-6g again and mixes.Sprayed silicon rubber cell phone keyboard is put into baking oven at 200 ℃ of following baking-curings after the spraying then.
Embodiment 2
The method of describing according to embodiment 1 prepares organosilicon coating, and sprays on the cell phone keyboard, is heating and curing, and different is to replace 64g black slurry (the peaceful 9007-V of section) with 64g silica gel black powder (Jia Nuo, 135 silica gel black powder).
Embodiment 3
10g dispersion agent (the good promise TR-200 in Dongguan) mixed with the 120g aviation kerosene soak and stirred 30 minutes, add 30g silica gel black powder (Jia Nuo, 135 silica gel black powder) again and mix and stirred 30 minutes.
Add silicone resin 90g, polymethyl hydrogen siloxane 9g then respectively, saturated polyester 18g, with dead front type isophorone diisocyanate 12g, and 10g gas-phase silica (Degussa, R972) and 3g inhibitor (the Dongguan Jia Nuo E15/45M of company), put into three-roller together and grind and mix, adjust three-roller roller spacing to being fit to size, the granularity that is ground to coating is promptly to obtain organosilicon coating below 15 microns.
When spraying this organosilicon coating of making, get this coating of 100g, adding proportioning is the mixed diluent 400-500g of 1: 1: 2 dimethylbenzene, toluene and aviation kerosene, and the spray viscosity that furnishing is suitable adds platinum catalyst 5-6g again and mixes.Sprayed silicon rubber cell phone keyboard is put into baking oven at 200 ℃ of following baking-curings after the spraying then.
Comparative Examples 1
The method of describing according to embodiment 1 prepares organosilicon coating, and sprays on the cell phone keyboard, is heating and curing, and different is not use saturated polyester and isocyanic ester.
Performance test
1, test wear resistance:
Use the RCA paper tape wear resistant instrument of model as F350001, under the effect of 175g power, applied the silicon rubber cell phone keyboard of coating with the working speed friction of 33 circle/Min, waited to be milled to when exposing the cell phone keyboard base material, the number of turns that the rubber wheel of recording paper strip wear resistant instrument rotates.When the number of turns of rotating 〉=80 were enclosed, thinking did not have wearing and tearing.
2, anti-laser engraving test:
Forming laser engraving literal on the silicon rubber cell phone keyboard of paint film, whether the literal of visual then coating surface engraving is clear, bright, then soaks into dehydrated alcohol (analytical pure, China produces greatly) with non-dust cloth, and wiping is 2 minutes on the literal on surface.
Qualified standard is: visual surface, do not allow vestige, and the literal of sample surfaces is clear.
Silicon rubber cell phone keyboard to the formation paint film of embodiment 1-2 and Comparative Examples 1 carries out performance test according to the method described above, and the results are shown in Table 1.
Table 1
From the data results of table 1 as can be seen, in Comparative Examples 1, do not add polyester and isocyanic ester, thereby the wear resistance of formed paint film is very poor, and has added polyester and isocyanic ester among the embodiment 1-3, has produced urethane and make the wear resistance of paint film improve a lot when film curing.
In addition, in embodiment 1, adopt mill base as pigment, the resulting paint film poor-performing of anti-the laser engraving, and the color opacifying power a little less than, and in embodiment 2 and 3, adopt the silica gel toner as pigment, the anti-laser engraving performance of resulting paint film is fine, and the color opacifying power is fine, and levelling property, spreadability are fine.And, in embodiment 3, to have added and increased hard agent, the wear resistance of paint film further improves.
Claims (10)
1. organosilicon coating, this coating contains silicone resin, pigment and solvent, it is characterized in that, described coating also contains the linking agent that silicone resin is crosslinked and polyester and isocyanic ester, based on described coating gross weight, the content of described silicone resin is 30-45 weight %, the content of described pigment is 10-30 weight %, the content of described linking agent is 3-4 weight %, the content of described solvent is 30-40 weight %, the content of described polyester is 4-6 weight %, and the content of described isocyanic ester is 2-4 weight %.
2. organosilicon coating according to claim 1, wherein, described linking agent is a polymethyl hydrogen siloxane, and described polyester is a saturated polyester, and described isocyanic ester is a masked isocyanate.
3. organosilicon coating according to claim 2, wherein, the number-average molecular weight of described polymethyl hydrogen siloxane is 100-200; The hydroxyl value of described saturated polyester is 75-95mgKOH/g, and number-average molecular weight is 3000-3500; The number-average molecular weight of described masked isocyanate is 580-690.
4. organosilicon coating according to claim 1, wherein, described pigment is the silica gel toner; Described solvent is an aviation kerosene.
5. organosilicon coating according to claim 1, wherein, described coating also contains dispersion agent, increases in hard agent and the inhibitor one or more;
Based on described coating gross weight, the content of described dispersion agent is 2-5 weight %, and the described content that increases hard agent is 3-15 weight %, and the content of described inhibitor is 0.8-1 weight %;
6. organosilicon coating according to claim 5, wherein, described dispersion agent is ultra-high molecular weight dispersion agent or cationic dispersing agent; The described Mohs' hardness that increases hard agent is 3-10Mohs, and particle diameter is the 20-80 millimicron, and described to increase hard agent be in aluminum oxide powder, ultrafine silica powder, silica powder, ceramics powder, silicate powder, the polymethylmethacrylate powder one or more; Described inhibitor is alkynol compound, ethene siloxanes, superoxide, contains the organism of N, P, S element, perhaps contains the ionic compound of Sn, Pb, Hg, Bi, As heavy metal.
7. the preparation method of the described organosilicon coating of claim 1, this method comprises silicone resin, pigment and solvent are even, obtain mixture, it is characterized in that, in described mixture, also add the linking agent that silicone resin is crosslinked, polyester and isocyanic ester mix, gross weight based on described coating, the consumption of described silicone resin is 30-45 weight %, the consumption of described pigment is 10-30 weight %, the consumption of described linking agent is 3-4 weight %, the consumption of described solvent is 30-40 weight %, and the consumption of described polyester is 4-6%, and the consumption of described isocyanic ester is 2-4 weight %.
8. method according to claim 7, wherein, described linking agent is a polymethyl hydrogen siloxane, and described polyester is a saturated polyester, and described isocyanic ester is a masked isocyanate; The number-average molecular weight of described polymethyl hydrogen siloxane is 100-200; The hydroxyl value of described saturated polyester is 75-95mgKOH/g, and number-average molecular weight is 3000-3500; The number-average molecular weight of described masked isocyanate is 580-690.
9. method according to claim 7, wherein, described pigment is the silica gel toner; Described solvent is an aviation kerosene.
10. method according to claim 7 wherein, also adds dispersion agent in described mixture, increase in hard agent and the inhibitor one or more; Based on described coating gross weight, the content of described dispersion agent is 2-5 weight %, and the described content that increases hard agent is 3-15 weight %, and the content of described inhibitor is 0.8-1 weight %.
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| CN102031056B (en) * | 2009-09-29 | 2013-04-10 | 比亚迪股份有限公司 | Coating as well as preparation method and use method thereof |
| US8610532B2 (en) * | 2011-12-23 | 2013-12-17 | Abb Technology Ag | Corrosion-resistant coating system for a dry-type transformer core |
| CN104497867B (en) * | 2014-12-31 | 2017-10-10 | 兴科电子(东莞)有限公司 | A kind of preparation method of low temperature silica gel ink and the application in electronic product |
| CN107227469B (en) * | 2017-06-26 | 2019-01-15 | 南京市产品质量监督检验院 | A kind of 3D gold electroforming solution, preparation method and its application firmly |
| FR3090621B1 (en) * | 2018-12-20 | 2022-07-22 | Eurokera | VITROCERAMIC ARTICLE |
| CN114149728B (en) * | 2021-12-30 | 2022-05-13 | 广东美涂士建材股份有限公司 | Impact-resistant wear-resistant polyester industrial coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1044673A (en) * | 1988-02-15 | 1990-08-15 | 国际公用装饰有限公司 | Prevent the method for marine biofouling |
| CN1100838C (en) * | 1999-03-05 | 2003-02-05 | 旭丽股份有限公司 | Organosilicon modified polyurethane paint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044673A (en) * | 1988-02-15 | 1990-08-15 | 国际公用装饰有限公司 | Prevent the method for marine biofouling |
| CN1100838C (en) * | 1999-03-05 | 2003-02-05 | 旭丽股份有限公司 | Organosilicon modified polyurethane paint |
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