WO2022127156A1 - Caoutchouc de silicone et son procédé de préparation, et piézorésistance et son procédé de préparation - Google Patents
Caoutchouc de silicone et son procédé de préparation, et piézorésistance et son procédé de préparation Download PDFInfo
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- WO2022127156A1 WO2022127156A1 PCT/CN2021/112820 CN2021112820W WO2022127156A1 WO 2022127156 A1 WO2022127156 A1 WO 2022127156A1 CN 2021112820 W CN2021112820 W CN 2021112820W WO 2022127156 A1 WO2022127156 A1 WO 2022127156A1
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- silicone oil
- mixture
- containing vinyl
- component
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- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 92
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 89
- 238000002360 preparation method Methods 0.000 title claims abstract description 65
- 229920002545 silicone oil Polymers 0.000 claims abstract description 157
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 105
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 103
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 103
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 52
- 239000001257 hydrogen Substances 0.000 claims abstract description 52
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 47
- 239000006229 carbon black Substances 0.000 claims abstract description 46
- 239000003063 flame retardant Substances 0.000 claims abstract description 46
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000003054 catalyst Substances 0.000 claims abstract description 35
- 239000003112 inhibitor Substances 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 129
- 238000002156 mixing Methods 0.000 claims description 54
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 11
- 150000002431 hydrogen Chemical class 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 20
- 238000003756 stirring Methods 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 14
- 238000005538 encapsulation Methods 0.000 description 13
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 229910052698 phosphorus Inorganic materials 0.000 description 10
- 229910052697 platinum Inorganic materials 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 238000003618 dip coating Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 238000007598 dipping method Methods 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- -1 hydroxy vinyl Chemical group 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical compound C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- JQZGUQIEPRIDMR-UHFFFAOYSA-N 3-methylbut-1-yn-1-ol Chemical compound CC(C)C#CO JQZGUQIEPRIDMR-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000004944 Liquid Silicone Rubber Substances 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 150000002894 organic compounds Chemical class 0.000 description 3
- 238000007665 sagging Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012757 flame retardant agent Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/02—Apparatus or processes specially adapted for manufacturing resistors adapted for manufacturing resistors with envelope or housing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
Definitions
- the present disclosure relates to the technical field of materials, in particular to a silicone rubber and a preparation method thereof, a varistor and a preparation method thereof.
- varistor encapsulation materials mainly include dip-coating epoxy resin encapsulation powder, dip-coating liquid epoxy resin, dip-coating phenolic resin encapsulation powder, and dip-coating silicone modified epoxy resin encapsulation powder.
- Sealing powder dip coating type self-adhesive liquid addition silicone rubber.
- Varistors prepared by dip-coating epoxy resin encapsulation powder, dip-coating phenolic resin encapsulating powder, and dip-coating silicone-modified epoxy resin encapsulating powder, pins and other special-shaped parts are prone to form stress, and the nearby The encapsulating material is prone to cracking after encapsulation.
- the encapsulation After the product is tested by severe high and low temperature impact (-40°C*0.5H, 125°C*0.5H, the temperature switching time interval is 3min, 10 cycles, the same below), the encapsulation The material is easy to crack; the varistor encapsulated by the dip-coated self-adhesive liquid addition type silicone rubber, because the cured silicone rubber has poor tear resistance, it is easy to be damaged by mechanical force, and the thickness is uneven.
- the bottom is thicker, 1.0-2.0mm, while the corners and top of the varistor are thinner, with a thickness of only 0.4-0.8mm.
- the breakdown voltage is 5-30KV.
- the technical problem to be solved by the present disclosure is to provide a silicone rubber and a preparation method thereof, a varistor and a preparation method thereof.
- the first technical solution adopted in the present disclosure is:
- a silicone rubber is prepared from the following raw materials: B-form hydroxy-containing vinyl silicone oil, A-form hydroxy-containing vinyl silicone oil, catalyst, white carbon black, flame retardant, aluminum hydroxide, low hydrogen-containing silicone oil and inhibitor.
- a preparation method of silicone rubber comprising the following steps:
- the preparation method of the A component is:
- the preparation method of the B component is:
- a varistor wherein the encapsulating material of the varistor is the above-mentioned silicone rubber.
- a preparation method of a varistor comprising the following steps:
- the above-mentioned silicone rubber is injected into the mold, the silicone rubber is molded with the varistor to be processed, and a mold release operation is performed after molding to obtain a varistor.
- the present disclosure provides a silicone rubber and a preparation method thereof, a varistor and a preparation method thereof, wherein the liquid silicone rubber is prepared from the following raw materials: B-form hydroxyl-containing vinyl silicone oil, A-form hydroxyl-containing vinyl silicone oil, catalyst , white carbon black, flame retardant, aluminum hydroxide, low-hydrogen silicone oil and inhibitor, so that the obtained silicone rubber not only has good high temperature and high humidity resistance, but also has excellent tear resistance. And the silicone rubber is obtained by the above-mentioned preparation method.
- the above-mentioned silicone rubber is used as the encapsulation material of the varistor to be applied on the varistor, and the varistor is organically combined.
- the thickness of the silicone rubber is reduced. It can be controlled by the mold, and the surface is flat. Compared with other dipping encapsulation materials, it can overcome the problem of sagging (uneven surface) caused by gravity after dipping. All parts of silicone rubber and varistor are in good condition.
- the bonding force belongs to the nature of chemical bonding. There is no volatilization of xylene or other solvents during the curing process, and the cured silicone rubber is not easy to be peeled off.
- Fig. 1 shows the equipment parameter table of a kind of injection molding machine according to the present disclosure
- Figure 2 shows a table of injection process parameters according to the present disclosure
- the silicone rubber provided by the present disclosure comprises the following raw materials: B-form hydroxy-containing vinyl silicone oil, A-form hydroxy-containing vinyl silicone oil, catalyst, silica, flame retardant, aluminum hydroxide, low hydrogen-containing silicone oil and inhibitors.
- the silicone rubber is prepared from the following raw materials: B-type hydroxy-containing vinyl silicone oil, A-type hydroxy-containing vinyl silicone oil, catalyst, silica, flame retardant, aluminum hydroxide, low-hydrogen silicone oil and inhibitor, so that the obtained Silicone rubber not only has good high temperature and high humidity resistance, but also has excellent tear resistance.
- the silicone rubber provided by the present disclosure has a viscosity of 70-90 Pa ⁇ s before curing, a density of 1.1-1.3 g/cm 3 , and the properties of the silicone rubber after curing: the tensile strength can reach 6-9MPa, and the elongation at break can reach 350%- 500%, tear strength (right angle) ⁇ 16 kN/m, Shore hardness A is 30-60, electrical strength ⁇ 20kV/mm, dielectric loss is (50Hz) 1( ⁇ 0.2) ⁇ 10 -4 , dielectric constant It is (50Hz) 2.5 ( ⁇ 0.2), the tracking resistance is 1A4.5, and the flame retardancy is FV0/1mm.
- the performance of high temperature and high humidity resistance is shown in: such as 621V varistor, the encapsulated product, the temperature is 85 °C, the humidity is 85%, the load DC voltage is 500Vd, after 1000h test, the varistor voltage change rate Less than 10%, leakage current ⁇ 25 ⁇ A;
- the corresponding product is injection type silicone rubber, if the white carbon black is 15-25 parts, the corresponding product is molded silicone rubber.
- color paste is also included.
- the color paste acts to tone and increase thixotropy. According to the above ratio, the color paste is 1.5 parts.
- tackifier is also included.
- the weight ratio of the tackifier and the catalyst is 1:1
- the viscosity of the B-form hydroxy-containing vinyl silicone oil is 30Pa ⁇ s
- the viscosity of the low-hydrogen silicone oil is 300-500mPa ⁇ s
- the active hydrogen content of the low-hydrogen silicone oil is 0.35%-0.50%.
- the viscosity of the hydroxyl-containing vinyl silicone oil of formula B is 40 Pa.s, and the viscosity of the low hydrogen-containing silicone oil is greater than 300 mPa.s.
- the preparation method of a kind of silicone rubber provided by the present disclosure comprises the following steps:
- the preparation method of the A component is:
- the preparation method of the B component is:
- the beneficial effect of the present disclosure is that the silicone rubber is prepared by the above preparation method.
- preparation method of described A component is specifically:
- the preparation method of the B component is specifically:
- preparation method of described A component is specifically:
- the preparation method of the B component is specifically:
- the tackifier is applied on the surface of metal substrates, inorganic substrates, and organic materials, which can effectively improve the surface properties of substrates and increase the bonding between substrates and adhesives. They have chemical reactions with the hydroxyl groups on the surface of the substrate and the active hydrogen and hydroxyl groups of the silicone rubber, respectively, and form a strong chemical bond (covalent bond) on the two interfaces.
- the bond energy of the chemical bond is larger than the intermolecular force. , so the presence of chemical bonds on the interface has a higher bond strength.
- preparation method of the B component is specifically:
- the present disclosure provides a varistor, wherein the encapsulating material of the varistor is the above-mentioned silicone rubber.
- the present disclosure also provides a method for preparing a varistor, comprising the following steps:
- the above-mentioned silicone rubber is injected into the mold, the silicone rubber is molded with the varistor to be processed, and a mold release operation is performed after molding to obtain a varistor.
- the beneficial effect of the present disclosure is that the above-mentioned silicone rubber is applied to the varistor as the encapsulating material of the varistor, and organically combined with the varistor, and at the same time, during the preparation process of the varistor, After the silicone rubber is injection molded, the thickness of the silicone rubber can be controlled by the mold, and the surface is smooth. Compared with other dipping encapsulation materials, it can overcome the problem of sagging (uneven surface) caused by gravity after dipping. Silicone rubber and various parts of the varistor have good bonding force, which is a chemical bonding property. There is no volatilization of xylene or other solvents during the curing process, and the cured silicone rubber is not easy to be peeled off.
- a liquid silicone rubber is prepared from the following raw materials: B-form hydroxy-containing vinyl silicone oil, A-form hydroxy-containing vinyl silicone oil, catalyst, white carbon black, flame retardant, aluminum hydroxide, low-hydrogen silicone oil and inhibitor .
- the viscosity of the hydroxyl-containing vinyl silicone oil of formula B is 30-50Pa.s; the viscosity of the hydroxyl-containing vinyl silicone oil of formula A is greater than 4000mPa.s;
- the catalyst is Karstedt platinum catalyst or peroxide type vulcanizing agent (such as 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane);
- the specific surface area of silica is 140-250m 2 /g, the silica is lower than 15% (preferably 8-15 parts) of the hydroxyl-containing vinyl silicone oil of formula B, and the silicone rubber is easily liquid, which is suitable for the injection process. Black is higher than 15%, and the silicone rubber is easy to be solid, which is suitable for the molding process.
- the active hydrogen content of low-hydrogen silicone oil is 0.35%-0.5%.
- the white carbon black has been treated with hexamethyldisilazane;
- the flame retardant is a halogen-free and environmentally friendly flame retardant containing nitrogen, phosphorus, silicon and benzene rings (P, N are macromolecular It exists in the form of organic compounds, and the platinum catalytic system is not poisoned);
- the inhibitor is a mixed solution of methyl butynol and 1-ethynyl cyclohexanol.
- the structural formula of low hydrogen silicone oil is:
- a silicone rubber is prepared from the following raw materials in parts by weight: 95-105 parts of B-form hydroxy-containing vinyl silicone oil, 3-7 parts of A-form hydroxy-containing vinyl silicone oil, 0.1-0.3 parts of catalyst, 8-15 parts of Silica, 25-35 parts of flame retardant, 35-45 parts of aluminum hydroxide, 8-12 parts of low hydrogen silicone oil and 0.1-0.3 parts of inhibitor.
- a silicone rubber is prepared from the following raw materials in parts by weight: 95 parts of B-form hydroxy-containing vinyl silicone oil, 3 parts of A-form hydroxy-containing vinyl silicone oil, 0.1 part of catalyst, 8 parts of white carbon black, 25 parts of flame retardant agent, 35 parts aluminum hydroxide, 8 parts low hydrogen silicone oil and 0.1 part inhibitor.
- a silicone rubber is prepared from the following raw materials in parts by weight: 100 parts of B-form hydroxy-containing vinyl silicone oil, 5 parts of A-form hydroxy-containing vinyl silicone oil, 0.2 parts of catalyst, 10 parts of white carbon black, and 30 parts of flame retardant agent, 40 parts aluminum hydroxide, 10 parts low hydrogen silicone oil and 0.2 part inhibitor.
- a silicone rubber is prepared from the following raw materials in parts by weight: 105 parts of B-form hydroxy-containing vinyl silicone oil, 7 parts of A-form hydroxy-containing vinyl silicone oil, 0.3 parts of platinum catalyst, 15 parts of white carbon black, 35 parts of resistance fuel, 45 parts of aluminum hydroxide, 12 parts of low-hydrogen silicone oil, 0.3 parts of inhibitor and 2 parts of color paste.
- the raw material of the silicone rubber also includes a tackifier.
- Embodiment 7 of the present disclosure is:
- the weight ratio of the tackifier to the catalyst is 1:1
- the viscosity of the B-form hydroxy-containing vinyl silicone oil is 30 Pa ⁇ s
- the low hydrogen-containing The viscosity of the silicone oil is 300-500 mPa.s
- the active hydrogen content of the low-hydrogen silicone oil is 0.35%-0.50%.
- the viscosity of the hydroxyl-containing vinyl silicone oil of formula B is 40 Pa ⁇ s, and the viscosity of the low hydrogen-containing silicone oil is greater than 300 mPa ⁇ s.
- the preparation method of a kind of silicone rubber provided by the present disclosure comprises the following steps:
- the preparation method of the A component is:
- the preparation method of the B component is:
- the preparation method of a kind of silicone rubber provided by the present disclosure comprises the following steps:
- the preparation method of the A component is:
- the preparation method of the B component is:
- the preparation method of a kind of silicone rubber provided by the present disclosure comprises the following steps:
- the preparation method of the A component is:
- the preparation method of the B component is:
- the A component and the B component are mixed to obtain the silicone rubber.
- Embodiment 12 of the present disclosure is:
- the preparation method of a kind of silicone rubber provided by the present disclosure comprises the following steps:
- the preparation method of the A component is specifically:
- the preparation method of the B component is specifically:
- the viscosity of the B-form hydroxy-containing vinyl silicone oil in the A component and the B component is both 20 Pa ⁇ s.
- the silicone rubber prepared by this example has a viscosity of 70 Pa ⁇ s before curing, a density of 1.3 g/cm 3 , and properties after curing: tensile strength is 6 MPa, elongation at break is 350%, tear strength (right angle ) is 16kN/m, the electric strength is 22kV/mm, the dielectric loss is (50Hz) 1.1 ⁇ 10 -4 , the dielectric constant is (50Hz) 2.5, the tracking resistance is 1A4.5, and the flame retardancy is FV0/1mm .
- GB/T 7124 the shear strength of tin-clad copper-VS-tin-clad copper or copper-VS-copper is 1.1MPa. Shore A hardness after curing was 60.
- the viscosity of adding 48.1kg is the B formula containing hydroxy vinyl silicone oil of 20Pa s, and then adding the A formula containing hydroxy vinyl silicone oil of 2.5kg and the low hydrogen containing silicone oil of 10kg, and the inhibitor (methyl methacrylate) of 0.2kg. butynyl alcohol and 1-ethynyl cyclohexanol mixed solution), and stir well;
- the preparation method of a kind of silicone rubber provided by the present disclosure comprises the following steps:
- the preparation method of the A component is specifically:
- the preparation method of the B component is specifically:
- the silicone rubber prepared by this example has a viscosity of 85 Pa ⁇ s before curing, a density of 1.2 g/cm 3 , and properties after curing: tensile strength is 7.2 MPa, elongation at break is 500%, tear strength ( Right angle) is 22kN/m, electric strength is 23kV/mm, dielectric loss is (50Hz) 1.2) ⁇ 10 -4 , dielectric constant is (50Hz) 2.7, tracking resistance is 1A4.5, and flame retardancy is FV0 /1mm. GB/T 7124, the shear strength of tin-clad copper-VS-tin-clad copper or copper-VS-copper is 1.2MPa. The Shore A hardness after curing was 45.
- the viscosity of adding 51.9kg is the B formula containing hydroxy vinyl silicone oil of 30Pa s, then adding the A formula containing hydroxy vinyl silicone oil of 2.5kg, the platinum catalyst of 0.2kg and the epoxy group containing 0.2kg. thickener, and stir well;
- the viscosity of adding 48.1kg is the B-type hydroxyl-containing vinyl silicone oil of 30Pa s, and then adding the A-type hydroxyl-containing vinyl silicone oil of 2.5kg and the high-viscosity low-hydrogen-containing silicone oil of 10kg (the low-hydrogen-containing silicone oil).
- the viscosity of silicone oil is greater than 300mPa.s), and 0.2kg of inhibitor (mixed solution of methylbutynol and 1-ethynylcyclohexanol), and stir well;
- the viscosity of the B-form hydroxy-containing vinyl silicone oil in the A component and the B component is both 40 Pa ⁇ s, and the low-hydrogen-containing silicone oil is a high-viscosity low-hydrogen-containing silicone oil. Silicone oil.
- the silicone rubber prepared by this example has a viscosity of 90Pa ⁇ s before curing, a density of 1.3g/cm 3 , and properties after curing: tensile strength can reach 7MPa, elongation at break can reach 450%, tear strength ( Right angle) 18kN/m, electrical strength ⁇ 21kV/mm, dielectric loss is (50Hz) 1.0 ⁇ 10 -4 , dielectric constant is (50Hz) 2.5, tracking resistance is 1A4.5, and flame retardancy is FV0/1mm .
- GB/T 7124 the shear strength of tin-clad copper-VS-tin-clad copper or copper-VS-copper is 1.0MPa. Shore A hardness after curing was 30.
- the viscosity of adding 48.1kg is the B-type hydroxy-containing vinyl silicone oil of 40Pa s, and then adding the A-type hydroxy-containing vinyl silicone oil of 2.5kg and the high-viscosity low-hydrogen-containing silicone oil of 10kg (the low-hydrogen-containing silicone oil).
- the viscosity of silicone oil is greater than 300mPa.s), and 0.2kg of inhibitor (mixed solution of methylbutynol and 1-ethynylcyclohexanol), and stir well;
- a varistor wherein the encapsulating material of the varistor is the above-mentioned silicone rubber.
- a preparation method of a varistor comprising the following steps:
- the above-mentioned silicone rubber is injected into the mold, the silicone rubber is molded with the varistor to be processed, and a mold release operation is performed after molding to obtain a varistor.
- the injection operation is completed by an injection molding machine.
- a vertical injection molding machine is selected. The equipment parameters of the vertical injection molding machine are shown in Figure 1.
- Component A in barrel A, component B in barrel B, and color paste in barrel P are metered by the feeding device (proportional valve), then transported to the pre-mixing chamber, mixed by the static split mixer, and injected into the mold In the middle, after the mold is closed, the injection-type silicone rubber is spread on the components and cured by heat. According to the difference of the sample size, it is ensured that there is no excess rubber edge.
- the process parameters can be referred to Figure 2:
- a 5 ⁇ m thick self-lubricating coating or PTFE coating can be sprayed on the inside of the mold in advance, and cured by baking at 150°C*10min and 380°C*10min.
- the present disclosure provides a silicone rubber and a preparation method thereof, a varistor and a preparation method thereof, wherein the silicone rubber is prepared from the following raw materials: B-type hydroxyl-containing vinyl silicone oil, A-type hydroxyl-containing vinyl Base silicone oil, platinum catalyst, silica, halogen-free environmentally friendly flame retardant, aluminum hydroxide, low-hydrogen silicone oil, inhibitor and color paste, so that the obtained liquid silicone rubber not only has good high temperature and high humidity resistance, but also has Excellent tear resistance. And the silicone rubber is obtained by the above-mentioned preparation method.
- the above-mentioned silicone rubber is used as the encapsulation material of the varistor to be applied on the varistor, and the varistor is organically combined.
- the thickness of the silicone rubber is reduced. It can be controlled by the mold, and the surface is flat. Compared with other dipping encapsulation materials, it can overcome the problem of sagging (uneven surface) caused by gravity after dipping. All parts of silicone rubber and varistor are in good condition.
- the bonding force belongs to the nature of chemical bonding. There is no volatilization of xylene or other solvents during the curing process, and the cured silicone rubber is not easy to be peeled off.
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Abstract
La présente divulgation concerne le domaine technique des matériaux et concerne en particulier un caoutchouc de silicone et son procédé de préparation ainsi qu'une piézorésistance et son procédé de préparation. Le caoutchouc de silicone est préparé à partir des matières premières suivantes : une huile de silicone vinylique contenant un hydroxyle de type B, une huile de silicone vinylique contenant un hydroxyle de type A, un catalyseur, du noir de carbone blanc, un ignifuge respectueux de l'environnement exempt d'halogène, de l'hydroxyde d'aluminium, de l'huile de silicone à faible teneur en hydrogène et un inhibiteur, de telle sorte que le caoutchouc de silicone obtenu présente non seulement de bonnes performances de résistance à haute température et à humidité élevée, mais présente également une excellente résistance à la déchirure.
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