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CN-122011618-A - Antistatic PVC rubber pad and preparation method and application thereof

CN122011618ACN 122011618 ACN122011618 ACN 122011618ACN-122011618-A

Abstract

The invention discloses an antistatic PVC rubber mat, a preparation method and application thereof, and relates to the field of PVC rubber mats. The rubber pad comprises an antistatic surface layer and a conductive bottom layer which are tightly attached, wherein the conductive bottom layer adopts acetylene black and carbon nano tube composite conductive filler which are synergistically modified by a silane coupling agent and a dispersing agent. During preparation, the composite conductive filler is prepared by ultrasonic dispersion, nitric acid activation and high-temperature shearing modification, and then the surface layer and the bottom layer raw materials are respectively mixed, melted and plasticized, and then the finished product is prepared by hot-pressing compounding, cooling and cutting. The invention solves the problems of agglomeration, poor compatibility and quick performance attenuation of the traditional conductive carbon black through the composite conductive network and layering design, has high-efficiency and stable antistatic performance, excellent interface binding force and mechanical flexibility, and is suitable for static protection scenes of table glue or ground glue in industries of electronic manufacturing, semiconductor packaging and the like.

Inventors

  • LI YONGPING
  • LI ZHAOYUAN
  • Li Zhaoyao
  • LI FUHONG
  • YAN TINGTING
  • WANG JIARONG

Assignees

  • 佛山威明塑胶有限公司

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. The antistatic PVC rubber pad is characterized by comprising an antistatic surface layer and a conductive bottom layer closely attached to the lower surface of the antistatic surface layer, wherein the antistatic surface layer comprises, by mass, 100 parts of PVC resin, 3-8 parts of antistatic agent, 20-40 parts of plasticizer, 1-3 parts of calcium-zinc stabilizer and 0.5-2 parts of lubricant, the conductive bottom layer comprises, by mass, 100 parts of PVC resin, 16-25 parts of composite conductive filler, 15-30 parts of plasticizer and 1-3 parts of calcium-zinc stabilizer, and the composite conductive filler is acetylene carbon black and carbon nanotubes modified by silane coupling agents and dispersing agents.
  2. 2. The antistatic PVC rubber mat according to claim 1, wherein the modification process of the composite conductive filler is that acetylene black and carbon nanotubes are added into absolute ethyl alcohol to be dispersed in an ultrasonic manner to form a suspension, a nitric acid solution is added into the suspension to be heated, a silane coupling agent and a dispersing agent are added into the suspension to be heated, the mixture is stirred and dispersed, and filter residues obtained after the suspension is filtered are dried, crushed and screened.
  3. 3. The antistatic PVC gasket of claim 2 wherein said silane coupling agent is gamma-methacryloxypropyl trimethoxysilane and said dispersant is polyethylene glycol having a molecular weight of 400.
  4. 4. The antistatic PVC rubber mat according to claim 3, wherein in the modification process of the composite conductive filler, the acetylene black is 15-25 parts by weight, the carbon nanotube is 1-3 parts by weight, the silane coupling agent is 2-4 parts by weight, the dispersing agent is 1-2 parts by weight, the absolute ethyl alcohol is 100-150 parts by weight, and the nitric acid solution is 0.5-1 part by weight, and the concentration of the nitric acid solution is 5%.
  5. 5. The antistatic PVC rubber mat according to claim 2, wherein the particle size of the acetylene black is 20 to 50nm, the outer diameter of the carbon nanotubes is 10 to 20nm, and the length is 1 to 5 μm.
  6. 6. The antistatic PVC rubber mat according to claim 2, wherein in the modification process of the composite conductive filler, nitric acid solution is added, the suspension is heated to 60-65 ℃ and kept at the temperature for 30-35 min, silane coupling agent and dispersing agent are added, the suspension is heated to 80-85 ℃ and sheared and dispersed for 60-70 min, filter residues are dried for 2-3 h at 100-110 ℃, and then the filter residues are screened by a 200-mesh screen.
  7. 7. The antistatic PVC gasket of claim 1 wherein the antistatic agent is cetyltrimethylammonium chloride, dioctadecyl dimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride or octadecyl trimethyl ammonium bromide, the plasticizer is epoxy castor oil, cyclohexane 1, 2-dicarboxylic acid diisononyl ester or dibutyl adipate, and the lubricant is stearic acid or butyl stearate.
  8. 8. The antistatic PVC rubber mat of claim 1, wherein the antistatic surface layer has a thickness of 0.8 to 2.5mm and the conductive bottom layer has a thickness of 0.7 to 2.5mm.
  9. 9. The preparation method of the antistatic PVC rubber mat is characterized by comprising the steps of mixing raw materials of an antistatic surface layer and a conductive bottom layer at 80-100 ℃ for 15-30 min respectively, adding the two groups of raw materials into an extruder respectively, melting and plasticizing at 160-180 ℃ to extrude to form a surface layer blank and a bottom layer blank, and carrying out hot pressing compounding and cooling on the surface layer blank and the bottom layer blank at 150-170 ℃ and 5-10 MPa to obtain the antistatic PVC rubber mat according to any one of claims 1-8.
  10. 10. An application of the antistatic PVC rubber cushion is characterized in that the antistatic PVC rubber cushion as claimed in any one of claims 1 to 8 is applied to table rubber or ground rubber, and when the antistatic PVC rubber cushion is applied to the ground rubber, the surface of the antistatic surface layer is formed with anti-slip lines.

Description

Antistatic PVC rubber pad and preparation method and application thereof Technical Field The invention relates to the field of PVC rubber mats, in particular to an antistatic PVC rubber mat, and a preparation method and application thereof. Background In precision electronics industries such as electronics manufacturing, semiconductor packaging, etc., electrostatic protection is an important step in the manufacturing process. Static electricity has a certain influence on products such as electronic components, integrated circuits and the like, and in addition, the static electricity can cause the products to adhere to dust due to dust adsorption. The antistatic PVC rubber pad (comprising the table rubber and the ground rubber) is a main stream material for electrostatic protection of an operation table surface and the ground of an electronic factory due to the advantages of controllable cost, convenient laying and the like, and is mainly formed by adding conductive filler into a PVC matrix and utilizing the conductive filler to form an electrostatic conduction path. Conductive carbon black is a common conductive filler, but because polar groups exist on the surface of the conductive carbon black, the intermolecular force is strong, agglomerates are easy to form in a PVC resin matrix, and the agglomerates are difficult to uniformly disperse, so that static electricity cannot be quickly and uniformly conducted away from the surface of a rubber pad. In addition, the conductive carbon black is an inorganic filler, the PVC resin is a nonpolar organic polymer material, and the interface affinity of the conductive carbon black and the PVC resin is weak, so that the PVC resin lacks an effective interface bonding effect. In the long-term use process, the conductive carbon black is easy to separate out and fall from the PVC resin matrix to cause the fracture of the conductive path which is originally constructed, meanwhile, the stability of a conductive network formed by single conductive carbon black is insufficient, and the surface resistance is gradually increased along with the extension of the use time, so that the antistatic performance is influenced. In the prior art, in order to improve the conductive path, the addition amount of the conductive carbon black can be increased, but excessive conductive carbon black can lead to reduced flexibility and increased brittleness of the rubber pad. Meanwhile, high addition amounts increase raw material costs and further exacerbate agglomeration problems. It can be seen that there is a need for improvements and improvements in the art. Disclosure of Invention In view of the technical problems of serious agglomeration, poor compatibility and the like of the conventional conductive carbon black in PVC rubber pad application, the invention aims to develop an antistatic PVC rubber pad which can realize uniform dispersion of conductive filler, stable interface combination and durable and efficient conductive performance, and a preparation method and application thereof, so as to meet the requirement of electronic manufacturing on electrostatic protection. In order to achieve the above purpose, the invention adopts the following technical scheme: The antistatic PVC rubber pad comprises an antistatic surface layer and a conductive bottom layer closely attached to the lower surface of the antistatic surface layer, wherein the antistatic surface layer comprises, by mass, 100 parts of PVC resin, 3-8 parts of antistatic agents, 20-40 parts of plasticizers, 1-3 parts of calcium-zinc stabilizers and 0.5-2 parts of lubricants, the conductive bottom layer comprises, by mass, 100 parts of PVC resin, 16-25 parts of composite conductive fillers, 15-30 parts of plasticizers and 1-3 parts of calcium-zinc stabilizers, and the composite conductive fillers are acetylene carbon black and carbon nanotubes modified by silane coupling agents and dispersing agents. The antistatic PVC rubber pad is characterized in that the modification process of the composite conductive filler comprises the steps of adding acetylene black and carbon nano tubes into absolute ethyl alcohol, performing ultrasonic dispersion to form a suspension, adding a nitric acid solution into the suspension, heating, adding a silane coupling agent and a dispersing agent into the suspension, heating, stirring and dispersing, and drying, crushing and sieving filter residues obtained after filtering the suspension. The antistatic PVC rubber pad is characterized in that the silane coupling agent is gamma-methacryloxypropyl trimethoxy silane, and the dispersing agent is polyethylene glycol with molecular weight of 400. The antistatic PVC rubber pad comprises, by weight, 15-25 parts of acetylene black, 1-3 parts of carbon nanotubes, 2-4 parts of silane coupling agents, 1-2 parts of dispersing agents, 100-150 parts of absolute ethyl alcohol, and 0.5-1 part of nitric acid solution, wherein the concentration of the nitric acid solution is