Insulated dimensionally stable screw

Abstract

The present application relates to the technical field of fastener, especially to the field of IPC F16B25, further to an insulated dimensionally stable screw, comprising a screw cap, a light rod part, a connecting column and a screw column which are integrally connected from top to bottom; the lower end of the screw column is a drill bit. The diameter of the screw column is controlled to be 5.45-5.65, so that the dimensional stability of the screw is improved, the damage and scrapping of the accessory caused by the oversize of the screw when the screw is screwed in are avoided, the adhesion between the insulation coating and the screw is good, and the screw has good insulation performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fasteners, in particular to the field of IPC F16B25, and further relates to an insulated dimensionally stable screw. BACKGROUND

[0002] Self-tapping screw fixing fittings have the advantage of not being easy to loosen, thereby avoiding the loosening or falling off of the fittings. However, some self-tapping screws have unstable dimensions, which can cause the fittings to be damaged or scrapped during the fixing process. In addition, some special fittings require self-tapping screws to have certain insulation properties, such as certain fittings in electric vehicles, mobile phones, and computers.

[0003] Chinese patent CN 202122204121 discloses a Si-containing DLC insulated screw. The Si-containing DLC insulated screw includes a screw body, the surface of the screw body is processed to form a polishing layer, the surface of the polishing layer is deposited with a metal layer, the surface of the metal layer is deposited with a DLC coating, the polishing layer is obtained after the screw body is polished, passivated, and deburred by a polishing device, the metal in the metal layer includes Ti and CR, the SP3 bond structure in the DLC coating is higher than 55%, and the DLC coating has a thickness greater than 10 μm. The polishing and deburring treatment of the screw can improve the adhesion of the DLC coating during deposition, the design of the metal layer can improve the adhesion of the DLC coating during deposition, and there is a sufficient stress release layer between the screw body and the DLC coating, which can also ensure the heat conduction performance of the screw. The design of the DLC coating can effectively improve the insulation of the screw. However, this technical solution is to deposit the metal layer and the DLC coating by deposition, and the adhesion of the metal layer and the DLC coating to the screw body needs to be improved. SUMMARY

[0004] The present application provides an insulated dimensionally stable screw, which comprises a screw cap 1, a light rod part 2, a connecting column 3, and a screw column 4 connected in sequence from top to bottom.

[0005] In some preferred embodiments, the insulated dimensionally stable screw further comprises an insulating coating on the surface of the insulated dimensionally stable screw.

[0006] In some preferred embodiments, the shape of the screw cap 1 is any one of hexagonal socket, cylindrical head, external hexagonal head, countersunk head, and half countersunk head.

[0007] Preferably, the shape of the screw cap 1 is hexagonal socket.

[0008] In some preferred embodiments, the lower end of the light rod part 2 has the same diameter as the upper end of the connecting column 3.

[0009] In some preferred embodiments, the lower end of the connecting column 3 has the same diameter as the screw column 4.

[0010] In some preferred embodiments, the surface of the screw column 4 is provided with screw threads.

[0011] In some preferred embodiments, the surface of the screw column 4 is provided with screw threads.

[0012] In some preferred embodiments, the surface of the screw column 4 is provided with screw threads.

[0013] In some preferred embodiments, the lower end of the screw column 4 has a trapezoidal or triangular cross section.

[0014] In some preferred embodiments, the lower end of the screw column 4 has a trapezoidal cross section.

[0015] In some preferred embodiments, the connecting column 3 has a trapezoidal cross section.

[0016] In some preferred embodiments, the diameter of the screw column 4 is 5.45-5.65 mm.

[0017] In some preferred embodiments, the diameter of the screw column 4 is 5.55 mm.

[0018] In some preferred embodiments, the material of the insulated dimensionally stable screw is carbon steel.

[0019] In some preferred embodiments, the insulation coating can be applied to the surface of the insulated dimensionally stable screw by dipping or coating.

[0020] In some preferred embodiments, the thickness of the coating is 1-3 µm.

[0021] In some preferred embodiments, the raw materials of the insulation coating include, by mass fraction: 40-60 parts of water-based emulsion, 20-40 parts of filler, 12-20 parts of curing agent, 3-10 parts of cosolvent, 2-5 parts of silane coupling agent, 0.5-1 part of anti-settling agent, 0.5-1 part of defoaming agent, 0.1-0.5 part of leveling agent, and 30-50 parts of deionized water.

[0022] In some preferred embodiments, the water-based emulsion is selected from one or more of acrylic emulsion, epoxy emulsion, fluorocarbon emulsion, styrene-acrylic emulsion, and silicone resin emulsion.

[0023] In some preferred embodiments, the water-based emulsion is an epoxy emulsion.

[0024] Preferably, the epoxy resin emulsion comprises epoxy resin emulsion A and epoxy resin emulsion B.

[0025] Preferably, the mass ratio of the epoxy resin emulsion A and the epoxy resin emulsion B is (1-3):(1-3).

[0026] Preferably, the mass ratio of the epoxy resin emulsion A and the epoxy resin emulsion B is 1:1.

[0027] Preferably, the epoxy value of the epoxy resin emulsion A is 0.3-0.5 eq / 100 g.

[0028] Preferably, the epoxy value of the epoxy resin emulsion A is 0.44±0.2 eq / 100 g.

[0029] Preferably, the epoxy resin emulsion B is a water dispersion of liquid bisphenol A epoxy resin.

[0030] Preferably, the epoxy value of the water dispersion of liquid bisphenol A epoxy resin is 0.4-0.5 eq / 100 g, and the solid mass content is 50-70%.

[0031] Preferably, the epoxy value of the water dispersion of liquid bisphenol A epoxy resin is 0.45±0.2 eq / 100 g, and the solid mass content is 60%.

[0032] In some preferred embodiments, the filler is selected from one or more combinations of potassium tetraborate, silicon dioxide, boron nitride, zinc oxide, aluminum oxide, mica powder, kaolin, talc powder, barium sulfate, calcium fluoride.

[0033] Preferably, the filler is a combination of wollastonite, mica powder, zinc oxide, and aluminum oxide.

[0034] Preferably, the mass ratio of the wollastonite, mica powder, zinc oxide, and aluminum oxide is (2-5):(1-3):(5-10):(5-10).

[0035] Preferably, the mass ratio of the wollastonite, mica powder, zinc oxide, and aluminum oxide is 3:2:6:8.

[0036] Preferably, the particle size of the wollastonite is 5-15 µm.

[0037] Preferably, the particle size of the wollastonite is 10 µm.

[0038] Preferably, the oil absorption of the mica powder is 26-35 g / 100 g.

[0039] Preferably, the oil absorption of the mica powder is 30.5±2.5 g / 100 g.

[0040] Preferably, the particle size of the zinc oxide is 10-30 nm.

[0041] Preferably, the particle size of the zinc oxide is 15 nm.

[0042] Preferably, the particle size of the aluminum oxide is 20-40 nm.

[0043] Preferably, the particle size of the aluminum oxide is 30 nm.

[0044] The applicant has found through a large number of experiments that when the filler is a combination of wollastonite, mica powder, zinc oxide and aluminum oxide, the mass ratio of wollastonite, mica powder, zinc oxide and aluminum oxide is (2-5): (1-3): (5-10): (5-10), and especially when the mass ratio of wollastonite, mica powder, zinc oxide and aluminum oxide is 3:2:6:8, the insulating properties of the screw can be improved while the adhesion between the coating and the screw is improved, and the flexibility of the coating is improved. The applicant believes that on the one hand, wollastonite, mica powder, zinc oxide and aluminum oxide complement each other, form a relatively dense accumulation, make the coating film have good density and closed type, and thus improve the resistance of the coating and have good insulation; on the other hand, wollastonite, mica powder, zinc oxide and aluminum oxide jointly reduce the volume shrinkage of the coating during the curing process and disperse the internal stress of the coating, thereby improving the adhesion between the coating and the screw and the flexibility of the coating. The applicant has further found in the experimental process that when the oil absorption of mica powder is 30.5±2.5 g / 100 g, the particle size of wollastonite is 10 µm, the particle size of zinc oxide is 15 nm, and the particle size of aluminum oxide is 30 nm, the insulating properties of the screw can be further improved while the cracking phenomenon of the coating can be avoided. The applicant believes that this is because under this condition, on the one hand, the fillers can be uniformly dispersed in the coating system, avoiding internal defects in the coating due to overlapping agglomeration of the fillers, thereby avoiding the cracking phenomenon of the coating.

[0045] In some preferred embodiments, the curing agent is a modified amine waterborne epoxy curing agent.

[0046] Preferably, the solid mass content of the modified amine waterborne epoxy curing agent is 65-80%.

[0047] In some preferred embodiments, the co-solvent is selected from one or more combinations of ethylene glycol, glycerol, isopropyl alcohol, and butanol.

[0048] In some preferred embodiments, the silane coupling agent is an amino silane coupling agent.

[0049] Preferably, the amino silane coupling agent is selected from one or a combination of 3-aminopropyltrimethoxysilane or 3-aminopropyltriethoxysilane.

[0050] Preferably, the anti-settling agent is selected from one or more combinations of organic bentonite, fumed silica, silicate.

[0051] Preferably, the anti-settling agent is a combination of organic bentonite and fumed silica.

[0052] Preferably, the mass ratio of the organic bentonite and the fumed silica is (3~5):(1~3).

[0053] Preferably, the mass ratio of the organic bentonite and the fumed silica is 4:3.

[0054] Preferably, the fumed silica is hydrophilic fumed silica.

[0055] Preferably, the specific surface area of the fumed silica is 150~250m 2 / g.

[0056] Preferably, the specific surface area of the fumed silica is 200±25m 2 / g.

[0057] In some preferred embodiments, the defoaming agent is selected from at least one of silicone defoaming agent, polyether defoaming agent.

[0058] Preferably, the defoaming agent is silicone defoaming agent.

[0059] In some preferred embodiments, the leveling agent is selected from at least one of silicone, acrylate copolymer, fluorocarbon compound.

[0060] Preferably, the leveling agent is acrylate copolymer.

[0061] Preferably, the acrylate copolymer is fluorine-modified acrylate copolymer.

[0062] In some preferred embodiments, the preparation method of the insulating coating is: mixing the water-based emulsion filler, the curing agent, the cosolvent, the silane coupling agent, the anti-settling agent, the defoaming agent, the leveling agent and deionized water uniformly to obtain the insulating coating.

[0063] Advantages:

[0064] 1、The diameter size of the screw post 4 is controlled to be 5.45~5.65, so that the size stability of the screw is improved, and the damage and scrapping of the accessory caused by the oversize of the screw when the screw is screwed in are avoided.

[0065] 2、The shape of the screw cap 1 is hexagonal, the light rod part 2 and the connecting column 3 are arranged, and the section of the connecting column 3 is trapezoidal, so that the accessory is not damaged by over-tightening of the screw, and the accessory is convenient to disassemble and replace.

[0066] 3. In this invention, epoxy resin emulsion A with an epoxy value of 0.44±0.2 eq / 100g and an aqueous dispersion of liquid bisphenol A epoxy resin with an epoxy value of 0.4~0.5 eq / 100g and a solid content of 50~70% are selected as film-forming emulsions, which improves the adhesion and insulation of the insulating coating.

[0067] 4. The present invention selects a combination of wollastonite, mica powder, zinc oxide and alumina as fillers, with the mass ratio of wollastonite, mica powder, zinc oxide and alumina being (2~5):(1~3):(5~10):(5~10). In particular, when the mass ratio of wollastonite, mica powder, zinc oxide and alumina is 3:2:6:8, it can improve the insulation performance of the screw, as well as the adhesion between the coating and the screw, and improve the flexibility of the coating.

[0068] 5. In this invention, an aminosilane coupling agent is selected as the silane coupling agent to improve the compatibility between the aqueous emulsion and the filler, thereby improving the adhesion, insulation and flexibility of the insulating coating. Attached Figure Description

[0069] Figure 1 This is a schematic diagram of the overall structure of the insulating dimension stabilizing screw in Example 1.

[0070] In the diagram: 1-nut, 2-smooth rod, 3-connecting post, 4-screw post.

[0071] Figure 2 This is a top view schematic diagram of the insulating dimension stabilizing screw of Example 1. Detailed Implementation

[0072] Example 1

[0073] Example 1 provides as follows Figure 1 and Figure 2 The illustrated insulating dimension stabilizing screw includes a screw cap 1, a smooth shaft 2, a connecting post 3, and a screw post 4, which are integrally connected from top to bottom; the lower end of the screw post is a drill bit.

[0074] The insulating dimension stabilizing screw also includes an insulating coating on the surface of the insulating dimension stabilizing screw.

[0075] The screw cap 1 is hexagonal washer.

[0076] The lower diameter of the optical rod 2 is the same as the upper diameter of the connecting post 3.

[0077] The lower end diameter of the connecting post 3 is the same as the diameter of the screw post 4.

[0078] The surface of the screw post 4 is provided with threads.

[0079] The screw post 4 has a convex surface and a concave surface.

[0080] The screw thread is arranged on the convex surface of the screw post 4.

[0081] The lower end of the screw post 4 has a trapezoidal cross section.

[0082] The connecting post 3 has a trapezoidal cross section.

[0083] The diameter of the screw post 4 is 5.55 mm.

[0084] The insulating dimensionally stable screw is made of carbon steel.

[0085] An insulating coating is coated on the surface of the insulating dimensionally stable screw.

[0086] The thickness of the coating is 2 µm.

[0087] The raw material of the insulating coating includes, by mass fraction, 50 parts of water-based emulsion, 35 parts of filler, 15 parts of curing agent, 8 parts of cosolvent, 4 parts of silane coupling agent, 0.8 parts of anti-settling agent, 0.8 parts of defoaming agent, 0.4 parts of leveling agent, and 40 parts of deionized water.

[0088] The water-based emulsion is an epoxy resin emulsion.

[0089] The epoxy resin emulsion includes epoxy resin emulsion A and epoxy resin emulsion B.

[0090] The mass ratio of the epoxy resin emulsion A and the epoxy resin emulsion B is 1:1.

[0091] The epoxy value of the epoxy resin emulsion A is 0.44±0.2 eq / 100g, and it is purchased from Shandong Ruishi Chemical Technology Co., Ltd. with model number WE-8223.

[0092] The epoxy resin emulsion B is a water dispersion of liquid bisphenol A epoxy resin.

[0093] The epoxy value of the water dispersion of liquid bisphenol A epoxy resin is 0.45±0.2 eq / 100g, and the solid mass content is 60%, which is purchased from Shandong Ruishi Chemical Technology Co., Ltd. with model number WE-8228.

[0094] The filler is a combination of wollastonite, mica powder, zinc oxide, and aluminum oxide.

[0095] The mass ratio of the wollastonite, mica powder, zinc oxide, and aluminum oxide is 3:2:6:8.

[0096] The particle size of the wollastonite is 10 µm, which is purchased from Jiangxi Oute Technology Co., Ltd.

[0097] The mica powder has an oil absorption of 30.5±2.5g / 100g, is purchased from Chuzhou Gei Mineral Industry Co., Ltd., and has a model number of GA-1.

[0098] The zinc oxide has a particle size of 15nm, is purchased from Beijing Deke Island Gold Technology Co., Ltd., and has a model number of DK-ZnO-15.

[0099] The aluminum oxide has a particle size of 30nm, is purchased from Hangzhou Hengna New Material Co., Ltd., and has a model number of HN-L30JY.

[0100] The curing agent is a modified amine waterborne epoxy curing agent.

[0101] The modified amine waterborne epoxy curing agent has a solid mass content of 75%, is purchased from Shandong Ruishi Chemical Technology Co., Ltd., and has a model number of WE-8116.

[0102] The cosolvent is isopropyl alcohol.

[0103] The silane coupling agent is an amino silane coupling agent.

[0104] The amino silane coupling agent is 3-aminopropyltrimethoxysilane, is purchased from Suzhou Jundao Electronics Co., Ltd., and has a model number of KBM-903.

[0105] The anti-settling agent is a combination of organic bentonite and fumed silica.

[0106] The mass ratio of the organic bentonite to the fumed silica is 4:3.

[0107] The organic bentonite is purchased from Zhejiang Yuhong New Material Co., Ltd., and has a model number of YH-938.

[0108] The fumed silica is hydrophilic fumed silica.

[0109] The fumed silica has a specific surface area of 200±25m 2 / g, and has a model number of Degussa AEROSIL 200.

[0110] The defoaming agent is an organic silicon defoaming agent, and has a model number of BYK-065.

[0111] The leveling agent is an acrylate copolymer.

[0112] The acrylate copolymer is a fluorine-modified acrylate copolymer, is purchased from Zhuhai Jintuan Chemical Co., Ltd., and has a model number of KEPERSURF®-387.

[0113] The preparation method of the insulating coating is as follows: uniformly mixing the water-based emulsion filler, the curing agent, the cosolvent, the silane coupling agent, the anti-settling agent, the defoaming agent, the leveling agent, and deionized water to obtain the insulating coating.

[0114] Performance test: The insulating coating was prepared on the insulating dimensionally stable screw, baked in a 200℃ oven for 45s, and tested for adhesion (reference standard: GB / T 1720-2020), interlayer resistance (reference standard: GB / T 2522-2007), and impact strength (reference standard: GB / T 1732-2020).

[0115] Test results: Adhesion: 1 level; interlayer resistance: 650Ω / mm 2 ; impact strength: 36cm.

[0116] Example 2

[0117] Example 2 provides an insulating dimensionally stable screw, comprising a screw cap 1, a light rod part 2, a connecting column 3, and a screw column 4 connected in sequence from top to bottom.

[0118] The insulating dimensionally stable screw further comprises an insulating coating on the surface of the insulating dimensionally stable screw.

[0119] The screw cap 1 is in the shape of a hexagonal socket.

[0120] The lower end diameter of the light rod part 2 is the same as the upper end diameter of the connecting column 3.

[0121] The lower end diameter of the connecting column 3 is the same as the diameter of the screw column 4.

[0122] The surface of the screw column 4 is provided with a screw thread.

[0123] The surface of the screw column 4 is provided with a screw thread.

[0124] The screw thread is arranged on the convex surface of the screw column 4.

[0125] The lower end cross section of the screw column 4 is trapezoidal.

[0126] The cross section of the connecting column 3 is trapezoidal.

[0127] The diameter of the screw column 4 is 5.55mm.

[0128] The material of the insulating dimensionally stable screw is carbon steel.

[0129] The insulating coating is coated on the surface of the insulating dimensionally stable screw.

[0130] The thickness of the coating is 2µm.

[0131] The raw material of the insulating coating includes, in mass parts, 45 parts of water-based emulsion, 30 parts of filler, 10 parts of curing agent, 6 parts of cosolvent, 3 parts of silane coupling agent, 0.6 parts of anti-settling agent, 0.6 parts of defoaming agent, 0.4 parts of leveling agent, and 35 parts of deionized water.

[0132] The water-based emulsion is an epoxy resin emulsion.

[0133] The epoxy resin emulsion includes epoxy resin emulsion A and epoxy resin emulsion B.

[0134] The mass ratio of the epoxy resin emulsion A and the epoxy resin emulsion B is 1:1.

[0135] The epoxy value of the epoxy resin emulsion A is 0.44±0.2 eq / 100g, and the epoxy resin emulsion A is purchased from Shandong Ruishi Chemical Technology Co., Ltd., model: WE-8223.

[0136] The epoxy resin emulsion B is a water dispersion of liquid bisphenol A epoxy resin.

[0137] The epoxy value of the water dispersion of liquid bisphenol A epoxy resin is 0.45±0.2 eq / 100g, and the solid mass content is 60%, and the water dispersion of liquid bisphenol A epoxy resin is purchased from Shandong Ruishi Chemical Technology Co., Ltd., model: WE-8228.

[0138] The filler is a combination of wollastonite, mica powder, zinc oxide, and aluminum oxide.

[0139] The mass ratio of the wollastonite, the mica powder, the zinc oxide, and the aluminum oxide is 3:2:6:8.

[0140] The particle size of the wollastonite is 10 µm, and the wollastonite is purchased from Jiangxi Oute Technology Co., Ltd.

[0141] The oil absorption of the mica powder is 30.5±2.5 g / 100g, and the mica powder is purchased from Chuzhou Ge Ray Mining Co., Ltd., model: GA-1.

[0142] The particle size of the zinc oxide is 15 nm, and the zinc oxide is purchased from Beijing Deke Daojin Technology Co., Ltd., model: DK-ZnO-15.

[0143] The particle size of the aluminum oxide is 30 nm, and the aluminum oxide is purchased from Hangzhou Hengna New Material Co., Ltd., model: HN-L30JY.

[0144] The curing agent is a modified amine water-based epoxy curing agent.

[0145] The solid mass content of the modified amine water-based epoxy curing agent is 75%, and the modified amine water-based epoxy curing agent is purchased from Shandong Ruishi Chemical Technology Co., Ltd., model: WE-8116.

[0146] The cosolvent is isopropyl alcohol.

[0147] The silane coupling agent is an amino silane coupling agent.

[0148] The amino silane coupling agent is 3-aminopropyltrimethoxysilane, purchased from Suzhou Jiandao Electronics Co., Ltd., model number: KBM-903.

[0149] The anti-settling agent is a combination of organic bentonite and fumed silica.

[0150] The mass ratio of the organic bentonite and the fumed silica is 4:3.

[0151] The organic bentonite is purchased from Zhejiang Yuhong New Material Co., Ltd., model number: YH-938.

[0152] The fumed silica is hydrophilic fumed silica.

[0153] The specific surface area of the fumed silica is 200±25 m 2 / g, model number: Degussa AEROSIL 200.

[0154] The defoaming agent is an organic silicon defoaming agent, model number: BYK-065.

[0155] The leveling agent is an acrylate copolymer.

[0156] The acrylate copolymer is a fluorine-modified acrylate copolymer, purchased from Zhuhai Jintuan Chemical Co., Ltd., model number: KEPERSURF®-387.

[0157] The preparation method of the insulating coating is as follows: uniformly mix the water-based emulsion filler, the curing agent, the cosolvent, the silane coupling agent, the anti-settling agent, the defoaming agent, the leveling agent, and deionized water to obtain the insulating coating.

[0158] Performance testing: the insulating coating is coated on the insulating dimensionally stable screw, baked in a 200°C oven for 45s, and tested for adhesion (reference standard: GB / T 1720-2020), interlayer resistance (reference standard: GB / T 2522-2007), and impact strength (reference standard: GB / T 1732-2020).

[0159] Test results: adhesion: 1 level; interlayer resistance: 645 Ω / mm 2 ; impact strength: 35 cm.

[0160] Example 3

[0161] Example 3 provides an insulating dimensionally stable screw, the specific embodiment of which is the same as that of Example 1, except that the mica powder is replaced with talc powder, which is purchased from Qingdao Kaiwei Powder Engineering Technology Co., Ltd.

[0162] Performance test: the insulating coating was prepared on the insulating dimensionally stable screw, baked in a 200℃ oven for 45s, and its adhesion (reference standard: GB / T 1720-2020), interlayer resistance (reference standard: GB / T 2522-2007), and impact strength (reference standard: GB / T 1732-2020) were tested.

[0163] Test results: adhesion: 2nd grade; interlayer resistance: 620Ω / mm 2 ; impact strength: 31cm.

[0164] Example 4

[0165] Example 4 provides an insulating dimensionally stable screw, whose specific embodiment is the same as that of Example 1, except that no wollastonite is added.

[0166] Performance test: the insulating coating was prepared on the insulating dimensionally stable screw, baked in a 200℃ oven for 45s, and its adhesion (reference standard: GB / T 1720-2020), interlayer resistance (reference standard: GB / T 2522-2007), and impact strength (reference standard: GB / T 1732-2020) were tested.

[0167] Test results: adhesion: 3rd grade; interlayer resistance: 560Ω / mm 2 ; impact strength: 26cm.

[0168] Example 5

[0169] Example 5 provides an insulating dimensionally stable screw, whose specific embodiment is the same as that of Example 1, except that the mica powder has an oil absorption of 38.5±3.5g / 100g and is purchased from Chuzhou Ge Ray Mining Co., Ltd., model: GA-6.

[0170] Performance test: the insulating coating was prepared on the insulating dimensionally stable screw, baked in a 200℃ oven for 45s, and its adhesion (reference standard: GB / T 1720-2020), interlayer resistance (reference standard: GB / T 2522-2007), and impact strength (reference standard: GB / T 1732-2020) were tested.

[0171] Test results: adhesion: 2nd grade; interlayer resistance: 610Ω / mm 2 ; impact strength: 30cm.

Claims

1. An insulating dimension-stabilizing screw, characterized in that, It includes a screw cap (1), a smooth rod (2), a connecting post (3), and a screw post (4) that are integrally connected from top to bottom; the lower end of the screw post (4) is a drill bit; The insulating dimension stabilizing screw also includes an insulating coating on the surface of the insulating dimension stabilizing screw; The cylindrical surface of the screw post (4) has a convex and concave structure; the diameter of the screw post (4) is 5.45~5.65mm; The lower end cross section of the screw post (4) is trapezoidal; The raw materials for the insulating coating, by weight, include: 40-60 parts of aqueous emulsion, 20-40 parts of filler, 12-20 parts of curing agent, 3-10 parts of co-solvent, 2-5 parts of silane coupling agent, 0.5-1 part of anti-settling agent, 0.5-1 part of defoamer, 0.1-0.5 parts of leveling agent, and 30-50 parts of deionized water; The aqueous emulsion is an epoxy resin emulsion; The filler is a combination of wollastonite, mica powder, zinc oxide and aluminum oxide, with a mass ratio of (2~5):(1~3):(5~10):(5~10).

2. The insulating dimension stabilizing screw according to claim 1, characterized in that, The shape of the screw cap (1) is any one of hexagonal washer, cylindrical head, external hexagonal head, countersunk head, and semi-countersunk head.

3. The insulating dimension stabilizing screw according to any one of claims 1 to 2, characterized in that, The surface of the screw post (4) is provided with threads.

4. The insulating dimension stabilizing screw according to claim 3, characterized in that, The thread is provided on the convex surface of the screw post (4).

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