CN117965056A - Sweat corrosion resistant electronic protective coating, and preparation method and application thereof - Google Patents
Sweat corrosion resistant electronic protective coating, and preparation method and application thereof Download PDFInfo
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- CN117965056A CN117965056A CN202311768957.6A CN202311768957A CN117965056A CN 117965056 A CN117965056 A CN 117965056A CN 202311768957 A CN202311768957 A CN 202311768957A CN 117965056 A CN117965056 A CN 117965056A
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- 239000011253 protective coating Substances 0.000 title claims abstract description 50
- 210000004243 sweat Anatomy 0.000 title claims abstract description 42
- 238000005260 corrosion Methods 0.000 title claims abstract description 31
- 230000007797 corrosion Effects 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 229920000642 polymer Polymers 0.000 claims abstract description 41
- 150000003505 terpenes Chemical class 0.000 claims abstract description 39
- 235000007586 terpenes Nutrition 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 37
- 239000002904 solvent Substances 0.000 claims abstract description 34
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 31
- 239000011248 coating agent Substances 0.000 claims abstract description 31
- 239000011347 resin Substances 0.000 claims abstract description 31
- 229920005989 resin Polymers 0.000 claims abstract description 31
- 229920001971 elastomer Polymers 0.000 claims abstract description 27
- 239000005060 rubber Substances 0.000 claims abstract description 27
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 18
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 17
- 239000003269 fluorescent indicator Substances 0.000 claims abstract description 16
- 239000013530 defoamer Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 23
- 239000002518 antifoaming agent Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 10
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 claims description 8
- 239000005011 phenolic resin Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 5
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 4
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 3
- 229920000459 Nitrile rubber Polymers 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 150000004982 aromatic amines Chemical class 0.000 claims description 3
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- DRRZZMBHJXLZRS-UHFFFAOYSA-N n-[3-[dimethoxy(methyl)silyl]propyl]cyclohexanamine Chemical compound CO[Si](C)(OC)CCCNC1CCCCC1 DRRZZMBHJXLZRS-UHFFFAOYSA-N 0.000 claims description 3
- 229920003052 natural elastomer Polymers 0.000 claims description 3
- 229920001194 natural rubber Polymers 0.000 claims description 3
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 150000007970 thio esters Chemical class 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 2
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 3
- 239000013522 chelant Substances 0.000 claims 1
- 239000004210 ether based solvent Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 11
- 239000007921 spray Substances 0.000 abstract description 3
- 238000004513 sizing Methods 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000007787 solid Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- MTEZSDOQASFMDI-UHFFFAOYSA-N 1-trimethoxysilylpropan-1-ol Chemical compound CCC(O)[Si](OC)(OC)OC MTEZSDOQASFMDI-UHFFFAOYSA-N 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000006081 fluorescent whitening agent Substances 0.000 description 2
- -1 3, 5-di-tert-butyl-4-hydroxyphenyl Chemical group 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 239000004447 silicone coating Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Abstract
The invention discloses an electronic protective coating capable of resisting sweat corrosion, a preparation method and application thereof, wherein the electronic protective coating comprises the following components in parts by weight: 5-20 parts of rubber type macromolecular polymer, 1-5 parts of terpene resin, 80-90 parts of environment-friendly solvent, 0.5-3 parts of silane coupling agent, 0.01-0.05 part of defoamer, 0.01-0.05 part of fluorescent indicator and 0.01-0.05 part of antioxidant. According to the invention, the rubber type macromolecular polymer is dissolved by the environment-friendly solvent, the interface bonding effect of the electronic protective coating is improved under the action of the silane coupling agent and the terpene resin, the thickness of the coating is not more than 10 mu m, the viscosity is lower than 20mPa.s, the coating is easy to spray, the flowing defoaming effect is good, the coating can be coated on the surface of an electronic component at the moment of spraying and sizing, the flexibility is excellent after solidification, the electronic component with the protruding parts such as R angle and the like can be effectively protected, and long-time electrified sweat test can be effectively resisted.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to an electronic protective coating capable of resisting sweat corrosion, and a preparation method and application thereof.
Background
Along with the gradual shift of electronic products to miniaturization, integration and multifunction, the electronic assembly industry is also developing at a high speed, and the requirements on the safety and reliability of the assembled products are also higher and higher, especially the printed circuit board, and as the electronic devices are widely applied to daily life, manufacturers and consumers are also paying more attention to the quality and reliability of the products.
With miniaturization of electronic products, the internal space of the products is further compressed, and the protective thickness of the coating material is required to be 20 μm,10 μm or even several μm thick. Conventional PECVD techniques (plasma enhanced chemical vapor deposition), while solving the thickness problem, use bulky and expensive equipment that can only be used in factory mode at the client, and cannot be used for on-line automated or semi-automated operations. In addition, due to the complexity and diversity of the existing electronic products, the circuit board has the area needing protection, and the area needing conduction and functionalization exists at the same time, the coating protection realized by the PECVD technology is omnidirectional, and the selective protection in the area can be realized only by a physical shielding mode, so that the cost performance of the product is greatly reduced, and a great amount of waste exists. Meanwhile, the traditional coating mode can only achieve plane protection, can not generate a good protection effect on the convex part of the electronic product such as an R angle, and cannot be used well in miniaturized electronic products.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide an electronic protective coating capable of resisting sweat corrosion, and a preparation method and application thereof.
In order to achieve the above purpose and achieve the above technical effects, the invention adopts the following technical scheme:
An electronic protective coating capable of resisting sweat corrosion comprises the following components in parts by weight:
5-20 parts of rubber type macromolecular polymer
1-5 Parts of terpene resin
80-90 Parts of environment-friendly solvent
Silane coupling agent 0.5-3 parts
0.01-0.05 Part of defoaming agent
0.01-0.05 Part of fluorescent indicator
0.01-0.05 Part of antioxidant.
Further, the rubber type macromolecular polymer is one or a combination of a plurality of natural rubber, styrene-butadiene rubber, polybutadiene rubber, nitrile rubber and silicone rubber.
Further, the terpene resin is a terpene phenol resin.
Furthermore, the environment-friendly solvent is one or a combination of a plurality of methylcyclohexane, dearomatization solvent oil, isoparaffin solvent and alcohol ether solvent.
Further, the silane coupling agent is one or a combination of a plurality of gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, vinyl tri (2-methoxyethoxy) silane, N-cyclohexyl-gamma-aminopropyl methyl dimethoxy silane, gamma-methacryloxypropyl trimethoxysilane and gamma-glycidoxypropyl triethoxysilane.
Further, the defoaming agent is one or a combination of a plurality of organic silicon defoaming agents, polymer type defoaming agents without mineral oil and organic silicon, and polymer and organic silicon mixed type defoaming agents.
Further, the antioxidant is one or a combination of more of aromatic amine antioxidants, hindered phenol antioxidants, thioester antioxidants, phosphite antioxidants and metal chelating antioxidants.
Further, the thickness of the electronic protective coating is not more than 10 μm.
The invention discloses a preparation method of an electronic protective coating capable of resisting sweat corrosion, which comprises the following steps:
a. Sequentially adding the environment-friendly solvent, the silane coupling agent, the defoaming agent, the fluorescent indicator and the antioxidant into a stirrer, controlling the temperature to be 20-30 ℃, and stirring for 10-30min at 200-400 rpm until stirring is uniform;
b. B, adding the rubber type macromolecular polymer into a stirrer in the step a, controlling the temperature to be 20-30 ℃, stirring at 200-400 r/min, and adding the rest amount again after a certain amount of the rubber type macromolecular polymer is required to be basically dissolved, wherein the stirring time is 4-5h according to the principle of a small amount of multiple times;
c. Adding the terpene resin into the stirrer in the step b, controlling the temperature to be 20-30 ℃, stirring at 200-400 r/min, and requiring the terpene phenol resin to be completely dissolved, wherein solid particles or powder are visible to naked eyes in the dissolution, and the stirring time is 0.5-1h.
The invention also discloses application of the sweat corrosion resistant electronic protective coating on the surface of the electronic component.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses an electronic protective coating capable of resisting sweat corrosion, a preparation method and application thereof, wherein a rubber type macromolecular polymer is dissolved by an environment-friendly solvent, the interface bonding effect of the electronic protective coating is improved under the action of a silane coupling agent and terpene resin, the thickness of the obtained electronic protective coating is not more than 10 mu m, the viscosity is lower than 20mPa.s, the electronic protective coating is easy to spray, the flowing defoaming effect is good, the electronic protective coating can be coated on the surface of an electronic component, particularly a convex part at the moment of spraying and sizing, the flexibility after curing is excellent, the insulating performance is excellent, the ageing resistance and the oil resistance are excellent, the electronic component with the convex part such as an R angle can be effectively protected, the long-time electrified sweat test can be effectively resisted, the function of protecting electrified sweat can be realized, the problems of glue shortage and poor protective performance on the surface of the electronic component caused by coating flowing due to low viscosity can be avoided, the high bonding reliability and the high oxidation resistance and ageing resistance can be realized, the electronic protective coating can be effectively judged under a fluorescent indicator, and the application range is wide.
Detailed Description
The present invention is described in detail below so that advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and unambiguous the scope of the present invention.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
On one hand, the invention discloses an electronic protective coating capable of resisting sweat corrosion, which comprises the following components in parts by weight:
5-20 parts of rubber type macromolecular polymer
1-5 Parts of terpene resin
80-90 Parts of environment-friendly solvent
Silane coupling agent 0.5-3 parts
0.01-0.05 Part of defoaming agent
0.01-0.05 Part of fluorescent indicator
0.01-0.05 Part of antioxidant.
The rubber type macromolecular polymer is one or the combination of a plurality of natural rubber, styrene-butadiene rubber, polybutadiene rubber, nitrile rubber and silicon rubber. The rubber macromolecular polymer can directly form a compact film layer with a net structure at the moment of volatilizing the environment-friendly solvent, and is coated on the surface of an electronic component, particularly a convex part such as an R angle and the like, so that a good protection effect is achieved, and the problems of flowing down and adhesive shortage of an electronic protection coating from the electronic component caused by low viscosity and low curing surface drying speed are avoided. Meanwhile, due to the inherent characteristics of the rubber type macromolecular polymer, the coating has excellent insulating property, aging resistance and oil resistance, and can effectively resist the corrosion influence caused by electrified sweat.
The terpene resin is terpene phenol resin, which is favorable for improving the adhesion of the electronic protective coating to the base material, thereby reducing the erosion effect of sweat on the interface in the sweat soaking process.
The environment-friendly solvent is one or a combination of a plurality of methylcyclohexane, dearomatization solvent oil, isoparaffin solvent and alcohol ether solvent, preferably the combination of methylcyclohexane and isoparaffin solvent. The environment-friendly solvent can better meet the environmental protection and regulation requirements of clients, the volatilization of the solvent can help the dissolution and film formation of the rubber macromolecular polymer, the solid content in the electronic protective coating can be adjusted by adopting the solvent, the viscosity operation range of the electronic protective coating material is wide, and the electronic protective coating material is favorable for being used under different working conditions and processes.
The silane coupling agent is one or a combination of a plurality of gamma-aminopropyl triethoxysilane, gamma-glycidyl ether oxypropyl trimethoxysilane, vinyl tri (2-methoxyethoxy) silane, N-cyclohexyl-gamma-aminopropyl methyl dimethoxy silane, gamma-methacryloxypropyl trimethoxysilane and gamma-glycidyl ether oxypropyl triethoxysilane, and preferably gamma-glycidyl ether oxypropyl trimethoxysilane A-187 is favorable for improving the adhesive force of the electronic protective coating to a substrate.
The defoaming agent is one or a combination of more of an organic silicon defoaming agent, a polymer type defoaming agent without mineral oil and/or organic silicon, a polymer and an organic silicon mixed type defoaming agent, preferably the polymer type defoaming agent without organic silicon, so that bubbles on the surface of the electronic protective coating can be reduced or avoided, and the defects of the coating are avoided.
The antioxidant is one or the combination of more of aromatic amine antioxidants, hindered phenol antioxidants, thioester antioxidants, phosphite antioxidants and metal chelating antioxidants, which is beneficial to improving the antioxidant property of the electronic protective coating and the ageing resistance property of the coating.
The fluorescent indicator is fluorescent whitening agent OB, and can effectively judge the coating effect of the electronic protective coating under the fluorescent indicator lamp.
On the other hand, the invention also discloses a preparation method of the sweat corrosion resistant electronic protective coating, which comprises the following steps:
a. Sequentially adding 80-90 parts of environment-friendly solvent, 0.5-3 parts of silane coupling agent, 0.01-0.05 part of defoamer, 0.01-0.05 part of fluorescent indicator and 0.01-0.05 part of antioxidant into a stirrer, and stirring for 10-30min at 200-400 rpm at a temperature of 20-30 ℃ until stirring is uniform;
b. B, adding the rubber type macromolecular polymer into a stirrer in the step a, controlling the temperature to be 20-30 ℃, stirring at 200-400 r/min, and adding the rest amount again after a certain amount of the rubber type macromolecular polymer is required to be basically dissolved according to the principle of a small amount of the rubber type macromolecular polymer for a plurality of times (1/3 of the total amount added each time), wherein the stirring time is 4-5h;
c. Adding 1-5 parts of terpene resin into the stirrer in the step b, controlling the temperature to be 20-30 ℃, stirring at 200-400 r/min, and requiring that the terpene resin be completely dissolved, wherein solid particles or powder are visible to naked eyes in the dissolution (the solid particle complete dissolution process), and stirring time is 0.5-1h.
The invention also discloses an application of the sweat corrosion resistant electronic protective coating on the surface of the electronic component.
The viscosity of the electronic protective coating prepared by the invention can be as low as 20 mPas or lower (mPas is a viscosity unit), the coating is easy to spray, the flowing defoaming effect is good, the thickness is not more than 10 mu m after solidification, the flexibility is excellent, electronic components with R angle and other convex parts can be effectively protected, long-time electrified sweat test can be effectively resisted, and the electronic protective coating is particularly suitable for sweat test as required by earphone industry, and has high bonding reliability and wide application range.
Example 1
An electronic protective coating capable of resisting sweat corrosion has an effective solid content of 12 percent and comprises the following components in parts by weight:
8 parts of rubber type macromolecular polymer
Terpene phenol resin 4 parts
88 Parts of environment-friendly solvent
Silane coupling agent 0.5 parts
0.03 Part of defoaming agent
Fluorescent indicator 0.01 part
0.01 Part of antioxidant.
The rubber type macromolecular polymer is styrene butadiene rubber.
The terpene resin is terpene phenol resin.
The environment-friendly solvent is isoparaffin solvent.
The silane coupling agent is gamma-glycidyl ether oxypropyl trimethoxy silane A-187.
The defoaming agent is a polymer type defoaming agent which does not contain organic silicon.
The fluorescent indicator is fluorescent whitening agent OB.
The antioxidant is a mixture of antioxidant 1010 and pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ].
A method for preparing an electronic protective coating capable of resisting sweat corrosion, comprising the following steps:
a. 88 parts of environment-friendly solvent, 0.5 part of silane coupling agent, 0.03 part of defoamer, 0.01 part of fluorescent indicator and 0.01 part of antioxidant are sequentially added into a stirrer, and the temperature is controlled at 20 ℃ and the stirrer is stirred for 10min at 200 rpm until the stirring is uniform;
b. b, adding the rubber type macromolecular polymer into a stirrer in the step a, controlling the temperature to be 20 ℃, stirring at 200 revolutions per minute, and adding the rest amount again after a certain amount of the rubber type macromolecular polymer is required to be basically dissolved, wherein according to the principle of a small amount of the rubber type macromolecular polymer for many times, the adding amount is 2 parts each time, and the stirring time is 4 hours;
c. Adding 4 parts of terpene resin into the stirrer in the step b, controlling the temperature to be 20 ℃, stirring at 200 revolutions per minute, and requiring the terpene resin to be completely dissolved, wherein solid particles or powder are visible to naked eyes in the dissolution, and the stirring time is 1h.
Example 2
The difference between this example and example 1 is that the sweat corrosion resistant electronic protective coating of this example comprises the following components in parts by weight:
10 parts of rubber type macromolecular polymer
Terpene resin 2 parts
88 Parts of environment-friendly solvent
Silane coupling agent 0.5 parts
0.03 Part of defoaming agent
Fluorescent indicator 0.01 part
0.01 Part of antioxidant.
The procedure is as in example 1.
Example 3
The difference between this example and example 1 is that the sweat corrosion resistant electronic protective coating of this example comprises the following components in parts by weight:
13 parts of rubber type macromolecular polymer
Terpene resin 1 part
86 Parts of environment-friendly solvent
Silane coupling agent 0.5 parts
0.03 Part of defoaming agent
Fluorescent indicator 0.01 part
0.01 Part of antioxidant.
The procedure is as in example 1.
Example 4
The difference between this example and example 1 is that the sweat corrosion resistant electronic protective coating of this example comprises the following components in parts by weight:
15 parts of rubber type macromolecular polymer
Terpene resin 3 parts
Environment-friendly solvent 82 parts
Silane coupling agent 0.5 parts
0.03 Part of defoaming agent
Fluorescent indicator 0.01 part
0.01 Part of antioxidant.
The procedure is as in example 1.
Comparative example 1
The difference between this comparative example and example 1 is that the electron protective coating of this comparative example does not contain terpene resin, the rubber-type macromolecular polymer is 12 parts, the environment-friendly solvent is 88 parts, and the rest is the same as example 1.
Comparative example 2
The present comparative example is different from example 1 in that the electronic protective coating of the present comparative example does not contain terpene resin, the rubber-type macromolecular polymer is 20 parts, the environment-friendly solvent is 80 parts, and the rest is the same as example 1.
Comparative example 3
Commercially available acrylic coatings.
Comparative example 4
Commercially available silicone coatings.
Comparative example 5
Commercially available alkyd resin type coatings.
Performance tests were performed on examples 1-4 and comparative examples 1-2, and the performance test conditions are specifically described below:
solidifying at room temperature, namely placing the mixture in a constant temperature and humidity room with the temperature of 23+/-2 ℃ and the R.H of 50 percent for 1 day;
The surface drying time, namely the surface drying time of the finger touch test electronic protective coating, is opened in a constant temperature and humidity room with the temperature of 23+/-2 ℃ and the R.H of 50%;
Adhesion test conditions: testing after curing for 1 day at room temperature;
viscosity test: cone plate viscometer, using a 42# rotor set to a speed of 250rpm at 25 ℃,3 times per set of examples to average;
and (3) testing the corrosion of the electrified sweat: direct current with voltage of 5V and current of 0.06mA, sweat is artificial sweat with ph=4.3; the test results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the coating layers of examples 1-4 were quick in surface drying, and were allowed to dry at room temperature for 10 minutes; the terpene resins of examples 1-4 were 4 parts, 2 parts, 1 part, and 3 parts by weight, respectively, the terpene resin of example 3 was less than the terpene resins of examples 1,2, and 4, resulting in the coating adhesion (4B) of example 3 being lower than the coating adhesion (5B) of examples 1,2, and 4, and the coating adhesion of comparative examples 1-2 was the lowest, as compared to comparative examples 1-2, without terpene resin, and with only 3B, indicating that the amount of terpene resin used affects the coating adhesion, and that the absence of terpene resin or a lower amount of terpene resin would result in a lower coating adhesion; meanwhile, the parts by weight of the terpene resin of example 3 is smaller than that of examples 2 and 4, resulting in that the coating of example 3 is shorter in the time of the sweat corrosion than that of examples 2 and 4, i.e., the coating of example 3 cannot withstand the sweat test for a long time, while the parts by weight of the terpene resin of example 1 is 4 parts, larger than that of examples 2 and 4, and the coating of example 1 is also shorter than that of examples 2 and 4, which is equivalent to that of example 3, i.e., the coating of example 1 cannot withstand the sweat test for a long time, and the coating of comparative examples 1-2 is less capable of withstand the sweat test for a long time than that of comparative examples 1-2, which means that the amount of terpene resin affects whether the coating can withstand the sweat test for a long time; from the above, the increase of terpene phenol resin is helpful for improving the adhesive force of the electronic protective coating, and can effectively improve the test time of the electrified sweat; the rubber-type macromolecular polymers of examples 1-4 were 8 parts by weight, 10 parts by weight, 13 parts by weight and 15 parts by weight, respectively, and were gradually increased, so that the viscosities of the coatings of examples 1-4 were also gradually increased, indicating that the amounts of the rubber-type macromolecular polymers affect the viscosities of the coatings, and the maximum amounts of the rubber-type macromolecular polymers of comparative example 2 and the maximum viscosities also indicate that the amounts of the rubber-type macromolecular polymers affect the viscosities of the coatings; the composition ratios of example 2 produced significantly better performance results than examples 1, 3,4 and comparative examples 1-2, and could be used as the best examples.
Performance tests were performed on example 1 and comparative examples 3 to 5, and the results are shown in table 2.
TABLE 2
| Example 1 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Viscosity (mPas) | 18 | 120 | 450 | 220 |
| Coating thickness (μm) | 5-10 | 80-120 | 50-100 | 40-80 |
| Adhesive force (3M adhesive tape hundred lattice test) | 5B | 5B | 4B | 5B |
| Sweat erosion (hr) | 4 | 0.3 | 0.2 | 0.2 |
| R angle coating condition | Excellent and excellent properties | Difference of difference | Difference of difference | Difference of difference |
As shown in Table 2, the viscosity of the electronic protective coating of example 1 is 18mPa.s, which is far lower than that of the coating of comparative examples 3-5, the thickness is 5-10 μm, which is far lower than that of the coating of comparative examples 3-5, and the adhesive force is as high as 5B, and the rubber macromolecular polymer in the coating is polymerized to form a film in a very short time in a super atomization mode, and has very good coating effect on the surface of electronic components, especially R corner, so that the electronic components can effectively resist the corrosion influence caused by electrified sweat, have better wetting and leveling properties, and can better meet the requirements on miniaturization and precision of electronic components.
Parts or structures of the present invention, which are not specifically described, may be existing technologies or existing products, and are not described herein.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (10)
1. An electronic protective coating capable of resisting sweat corrosion is characterized by comprising the following components in parts by weight:
5-20 parts of rubber type macromolecular polymer
1-5 Parts of terpene resin
80-90 Parts of environment-friendly solvent
Silane coupling agent 0.5-3 parts
0.01-0.05 Part of defoaming agent
0.01-0.05 Part of fluorescent indicator
0.01-0.05 Part of antioxidant.
2. The sweat corrosion resistant electronic protective coating according to claim 1, wherein the rubber-type macromolecular polymer is one or a combination of several of natural rubber, styrene-butadiene rubber, polybutadiene rubber, nitrile rubber and silicone rubber.
3. The sweat-corrosion resistant electronic protective coating of claim 1, wherein said terpene resin is a terpene phenol resin.
4. The sweat corrosion resistant electronic protective coating according to claim 1, wherein the environmentally friendly solvent is one or a combination of several of methylcyclohexane, dearomatized solvent oil, isoparaffinic solvents, alcohol ether solvents.
5. The sweat corrosion resistant electronic protective coating according to claim 1, wherein the silane coupling agent is one or a combination of several of gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, vinyltris (2-methoxyethoxy) silane, N-cyclohexyl-gamma-aminopropyl methyldimethoxy silane, gamma-methacryloxypropyl trimethoxysilane, gamma-glycidoxypropyl triethoxysilane.
6. The sweat-corrosion resistant electronic protective coating according to claim 1, wherein said defoamer is one or a combination of silicone defoamer, mineral oil and silicone free polymeric defoamer, polymer and silicone hybrid defoamer.
7. The sweat corrosion resistant electronic protective coating according to claim 1, wherein the antioxidant is one or a combination of several of aromatic amine antioxidants, hindered phenol antioxidants, thio-ester antioxidants, phosphite antioxidants and metal chelate antioxidants.
8. An electronic protective sweat corrosion resistant coating according to any one of claims 1 to 7, wherein the thickness of the electronic protective coating is not more than 10 μm.
9. A method of preparing an anti-sweat corrosion electronic protective coating according to any one of claims 1 to 8, comprising the steps of:
a. Sequentially adding the environment-friendly solvent, the silane coupling agent, the defoaming agent, the fluorescent indicator and the antioxidant into a stirrer, controlling the temperature to be 20-30 ℃, and stirring for 10-30min at 200-400 rpm until stirring is uniform;
b. B, adding the rubber type macromolecular polymer into a stirrer in the step a, controlling the temperature to be 20-30 ℃, stirring at 200-400 r/min, and adding the rest amount again after a certain amount of the rubber type macromolecular polymer is required to be basically dissolved, wherein the stirring time is 4-5h according to the principle of a small amount of multiple times;
c. Adding the terpene resin into the stirrer in the step b, controlling the temperature to be 20-30 ℃, stirring at 200-400 r/min, and requiring the terpene phenol resin to be completely dissolved, wherein the stirring time is 0.5-1h.
10. Use of an anti-sweat corrosion electronic protective coating according to any of claims 1-8 on the surface of an electronic component.
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