CN-122008094-A - Grinding abrasive cloth containing innovative substrate coating and preparation method thereof

CN122008094ACN 122008094 ACN122008094 ACN 122008094ACN-122008094-A

Abstract

The application relates to the technical field of grinding tool abrasive cloth manufacturing, in particular to grinding abrasive cloth containing an innovative substrate coating and a preparation method thereof, which comprises the steps of taking alkali-free glass fiber fabric as a substrate, the three-dimensional through heat conduction network formed by nanometer boron nitride and alumina sol is constructed, and is coated with a gradient crosslinking type primer layer and a functional covering layer, and the three-dimensional through heat conduction network is prepared through stepped heating solidification and plasma surface activation treatment. The application can effectively solve the problems of thermal aging of the adhesive layer, burning loss of the base cloth and abrasive dust blockage in the grinding process, remarkably improves the heat dissipation, the abrasive bonding strength and the chip removal efficiency, and is suitable for high-load long-time grinding working conditions.

Inventors

HUANG HAIMING
CHEN XUWU
ZHENG JIE
YIN TING

Assignees

常州市金牛研磨有限公司

Dates

Publication Date: 20260512
Application Date: 20260311

Claims (9)

1. The preparation method of the grinding abrasive cloth containing the innovative substrate coating is characterized by comprising the following steps of: s10, carrying out surface hydroxylation treatment on an alkali-free glass fiber fabric to obtain a modified base fabric with a surface rich in silicon hydroxyl groups; S20, immersing the modified base cloth in an aqueous dispersion liquid containing nano boron nitride, alumina sol and a silane coupling agent, and rolling and drying to form a composite base material with a three-dimensional through heat conducting network; S30, coating a primer layer on the surface of the composite substrate, wherein the primer layer consists of modified phenolic resin, flexible epoxy prepolymer, nano silicon dioxide and organic borate; S40, implanting abrasive particles in an incompletely cured state of the primer layer, and coating a glue coating layer on the surface of the abrasive particles, wherein the glue coating layer consists of polyurethane modified phenolic resin, cryolite micropowder, graphene quantum dots and nonionic surfactant; And S50, sequentially carrying out step heating solidification and plasma surface activation treatment on the coated abrasive cloth to obtain the abrasive cloth containing the innovative substrate coating.
2. The method of manufacturing a grinding abrasive cloth with an innovative substrate coating according to claim 1, wherein in the step S10, the alkali-free glass fiber fabric is treated with a sodium hydroxide aqueous solution with a concentration of five to ten percent at sixty degrees celsius to eighty degrees celsius for fifteen minutes to thirty minutes, then rinsed with deionized water to neutrality, then soaked in a silane coupling agent ethanol solution with a concentration of three to six percent for one hour to two hours, and dried at one hundred degrees celsius to one hundred twenty degrees celsius for thirty minutes to sixty minutes after being taken out.
3. The method for preparing grinding abrasive cloth containing the innovative substrate coating according to claim 1, wherein in the step S20, the aqueous dispersion liquid consists of two to five percent by mass of nano boron nitride, ten to twenty percent by mass of alumina sol, five to one and a half percent by mass of silane coupling agent and the balance of deionized water, wherein the nano boron nitride has a particle size of fifty nanometers to two hundred nanometers, the alumina content in the alumina sol is ten to fifteen percent, and the silane coupling agent is one or two of gamma-aminopropyl triethoxysilane or gamma-glycidyl ether oxypropyl trimethoxysilane.
4. The method for preparing the grinding abrasive cloth with the innovative substrate coating according to claim 1, wherein in the step S30, the solid content of the primer layer is forty to sixty percent, the components of the grinding abrasive cloth are, by mass, one hundred parts of modified phenolic resin, twenty to forty parts of flexible epoxy prepolymer, five to fifteen parts of nano silicon dioxide and three to eight parts of organic boric acid ester, wherein the modified phenolic resin is cardanol modified phenolic resin, the free phenol content of the modified phenolic resin is lower than two percent, the flexible epoxy prepolymer is obtained by reacting polyether glycol with epichlorohydrin, the number average molecular weight of the flexible epoxy prepolymer is two thousand to five thousand, the particle size of the nano silicon dioxide is ten nanometers to fifty nanometers, and the organic boric acid ester is an esterification product of phenyl boric acid and pentaerythritol.
5. The method for preparing the grinding abrasive cloth with the innovative substrate coating according to claim 1, wherein in the step S40, abrasive particles are one of brown fused alumina, silicon carbide or ceramic corundum, the particle size range is P60-P220, an electrostatic sand planting mode is adopted for abrasive implantation, the sand planting density is three thousand-grains to five thousand-grains per square centimeter, the solid content of the covering layer is thirty-five percent to fifty-five percent, the components of the grinding abrasive cloth are, by mass, one hundred parts of polyurethane modified phenolic resin, ten-twenty-five parts of cryolite micro powder, five-two parts of graphene quantum dots and three-five parts to one-five parts of nonionic surfactant, wherein the polyurethane modified phenolic resin is prepared by reacting isophorone diisocyanate, polycaprolactone diol and phenolic resin prepolymer, the content of isocyanate groups is two-four percent, the particle size of the cryolite micro powder is one micron to five microns, the average particle size of the graphene quantum dots is three nanometers to eight nanometers, the content of oxygen-containing functional groups is five to fifteen percent, and the nonionic surfactant is polyoxyethylene ether of fatty alcohol ether or polyoxyethylene ether.
6. The method according to claim 1, wherein in the step S50, the step-heating curing process is performed by first maintaining the temperature at one hundred degrees celsius to one hundred twenty degrees celsius for thirty minutes, then maintaining the temperature at one hundred forty degrees celsius to one hundred sixty degrees celsius for sixty minutes, and finally maintaining the temperature at one hundred eighty degrees celsius to two hundred degrees celsius for ninety minutes, wherein the plasma surface activation process is performed by using an atmospheric air plasma with a power of five hundred watts to one kw, a processing speed of five meters per minute to fifteen meters per minute, and a processing time of ten seconds to thirty seconds.
7. The method for preparing a grinding abrasive cloth containing an innovative substrate coating according to claim 4, wherein the method for preparing the modified phenolic resin comprises the following steps: Mixing phenol, cardanol and formaldehyde according to a mass ratio of one to three to six, eight to two, and reacting for two to four hours at seventy to ninety ℃ under the catalysis of sodium hydroxide to obtain an oligomer; And R2, distilling the oligomer under reduced pressure to remove unreacted monomers, adding epoxy chloropropane accounting for five to ten percent of the total mass, continuously reacting for one to three hours at ninety degrees to one hundred and ten degrees centigrade, and cooling to obtain the modified phenolic resin.
8. The method of preparing a grinding abrasive cloth comprising an innovative substrate coating according to claim 4, wherein the method of preparing the flexible epoxy prepolymer comprises the steps of: E1, mixing polyether glycol and epichlorohydrin according to a mass ratio of one to four to seven, adding tetramethyl ammonium chloride accounting for five to one hundred percent of the total mass, and reacting for four to six hours at sixty-eighty ℃ at the temperature of sixty ℃ to eighty ℃; and E2, after the reaction is finished, washing the epoxy prepolymer with deionized water for three times, and distilling the epoxy prepolymer under reduced pressure to remove water and unreacted substances to obtain the flexible epoxy prepolymer.
9. A grinding abrasive cloth comprising an innovative substrate coating, characterized in that it is produced by the production method according to any one of claims 1 to 8.

Description

Grinding abrasive cloth containing innovative substrate coating and preparation method thereof Technical Field The invention belongs to the technical field of grinding abrasive cloth manufacturing, and particularly relates to grinding abrasive cloth containing an innovative substrate coating and a preparation method thereof. Background The abrasive cloth is used as an important coated abrasive tool and is widely applied to surface processing of metal and nonmetal materials. Its properties are mainly dependent on the substrate, abrasive type, particle size distribution and overall match of the adhesive system. The substrate coating is used as a key interface layer for connecting the abrasive and the base cloth, so that the adhesive strength of the abrasive is affected, and the heat dissipation, the blocking resistance and the service life of the abrasive cloth under high-load and high-temperature working conditions are directly related. Therefore, developing an innovative substrate coating with excellent bonding strength, good thermal stability and high-efficiency heat dissipation capability is a core technical direction for improving the overall performance of the grinding abrasive cloth. In the prior art, various improvements aiming at the abrasive cloth glue layer or the substrate structure exist. For example, patent CN111826108B discloses a sizing layer of precision grinding coated abrasive and a method for preparing the same, the sizing layer consisting of a first sizing adhesive (eighty percent to eighty-five percent), a second sizing adhesive (eight percent to fifteen percent), a thixotropic dispersant (two percent to five percent), titanium pigment (three percent to five percent) and an epoxy curing agent (five percent to eight percent). The scheme aims to improve the bonding strength, the waterproof anti-blocking performance and the heat dissipation performance of the rubberized layer through multicomponent compounding, so that the grinding temperature is reduced and the material cutting rate is improved. However, the technical scheme still has the obvious defects that the adopted epoxy resin system has certain strength, but is easy to thermally age in the heavy-load continuous grinding process to cause embrittlement of a glue layer and falling of an abrasive, and meanwhile, the inorganic fillers such as titanium dioxide and the like are helpful for heat dissipation, but have limited dispersibility in organic resin, are difficult to form continuous and efficient heat conduction channels, and have limited overall heat management capability. Another related technology is a heavy-load high-temperature-resistant precision grinding abrasive cloth primer and a coating disclosed in patent CN111941297B and a preparation method thereof. The scheme adopts water-soluble phenolic resin as a base, and prepares high-toughness primer through modification of silicone grease, glycol diethyl ether and organic silicon, and prepares heat-resistant coating through modification of cryolite, titanium dioxide, span, nonionic polyurethane and the like. The technology emphasizes the high temperature resistance and the bonding strength of the adhesive layer, and is suitable for the heavy-load working condition. The method has the advantages that the phenolic resin system is high in crosslinking density and high in brittleness after being cured, and is difficult to balance high toughness and high heat resistance despite being modified by flexible components such as organic silicon, in addition, the scheme does not perform functional design on a base material, only relies on performance improvement of a glue layer, the problem of 'burning cloth' caused by accumulation of heat in the base cloth in the grinding process can not be fundamentally solved, and the efficient construction of a abrasive dust discharge channel is lacking, so that surface blockage of abrasive cloth is easy to cause, and grinding efficiency is reduced. In summary, although the prior art has advanced in the aspects of adhesive formulation, abrasive arrangement, etc., the prior art still has significant drawbacks in the aspects of co-design of a substrate and a coating, construction of a high-efficiency heat conduction path, structural stability of the coating in a dynamic grinding environment, etc., and is difficult to meet the comprehensive requirements of the high-end manufacturing field on high-efficiency, long-life and low-damage precision grinding. Therefore, development of a grinding abrasive cloth containing an innovative substrate coating and a preparation method thereof are needed, and systematic improvement of grinding performance is realized through substrate functionalization and coating multi-scale structural design. Disclosure of Invention The invention provides grinding abrasive cloth containing an innovative substrate coating and a preparation method thereof, and aims to solve the problems that abrasive materials fall off, abrasive cloth is b