CN-122008098-A - Sand paper production method with gradient particle size abrasive distribution

CN122008098ACN 122008098 ACN122008098 ACN 122008098ACN-122008098-A

Abstract

The invention relates to the technical field of sand paper production, in particular to a sand paper production method with gradient particle size abrasive distribution, which solves the defects in the prior art and comprises the following steps: s1, performing primer construction; s2, performing bottom layer sand planting; s3, constructing an intermediate isolation layer; s4, performing surface sand planting; s5, carrying out finished product post-treatment; compared with the prior art, the invention obviously improves the service life of the abrasive paper, reduces the consumable replacement frequency and the cost, can effectively avoid the phenomenon of excessive wear or burn caused by overlarge local pressure, ensures the high consistency of the surface quality of the workpiece, and can also provide reliable physical guarantee for the self-repairing and self-exposing functions of the product.

Inventors

WANG BIN
YANG YANG
JIANG WENLONG
CHAO JIANWEI

Assignees

常州市金牛研磨有限公司

Dates

Publication Date: 20260512
Application Date: 20260313

Claims (6)

1. A method for producing sandpaper with gradient particle size abrasive distribution, comprising the steps of: S1, performing primer construction, namely uniformly coating modified phenolic resin primer on the surface of a latex paper substrate treated by an oil penetration prevention process by using precise roller coating equipment comprising a metering mechanism and a coating mechanism, wherein the modified phenolic resin primer contains a rubber modified component and an active filling component, and coating the modified phenolic resin primer by adjusting the roller speed ratio to form a primer coating with bonding strength on the surface of the substrate; S2, performing bottom layer sand planting, namely starting a direct current electrostatic generator, regulating output voltage, constructing a high-voltage direct current electric field between polar plates, adsorbing a first abrasive to a primer coating by utilizing electric field force generated by the high-voltage electrostatic field, and guiding by the electric field force to enable the long axis of the first abrasive to be perpendicular to the plane direction of a latex paper base material so as to drive the tip of the abrasive to be embedded into the primer layer, thereby forming a bottom layer abrasive layer with high cutting characteristics; S3, constructing an intermediate isolation layer, namely sending a base material implanted with the abrasive into a drying device and carrying out pretreatment under the environment of 85 ℃, after the primer is primarily shaped and the arrangement posture of the bottom abrasive is locked, coating polyurethane resin containing an elastic regulator and an interface reinforcing component on the surface of the bottom abrasive layer, forming an elastic intermediate isolation layer by using a precise knife coating process, and completely covering the tip end of the bottom abrasive by the elastic intermediate isolation layer to form a secondary coating base surface; s4, performing surface layer sand planting, namely switching an electric field environment into a pulse electric field, implanting a second abrasive on the surface of the middle isolation layer, and utilizing periodic fluctuation of electric field force caused by the pulse electric field to promote the second abrasive to form a non-uniform scattering arrangement state on the surface of the middle isolation layer so as to construct a surface layer abrasive layer for fine grinding; S5, carrying out finished product post-treatment, namely sending the sand paper with the multilayer composite structure into a step temperature control drying device, continuously preserving heat in a plurality of temperature intervals according to a heating curve, then completing crosslinking and curing of a primer layer and an intermediate isolation layer resin system and forming a three-dimensional network structure, mechanically softening the cured sand paper through a group of roller mechanisms which are formed by alternately arranging steel press rollers and rubber support rollers, and carrying out reciprocating bending through controlling the staggered depth of the roller mechanisms.
2. A method for producing coated abrasive having gradient particle size distribution according to claim 1, wherein in step S1, the gram weight of the latex paper substrate is set to 120-160g/m 2 , the oil penetration prevention process employs a fluoropolymer coating, the rubber modifying component is a nitrile rubber modifier, and the active filler component is cryolite powder.
3. A method for producing coated abrasive having gradient particle size distribution according to claim 1, wherein in step S2, the positive electrode of the direct current electrostatic generator is connected to the primer coating roller, the negative electrode is connected to the abrasive conveyor belt, the plate pitch is set at 85-100mm, and the first abrasive is a ceramic aluminum abrasive.
4. The method according to claim 1, wherein in the step S3, the elastic modifier is hydroxyl-terminated polybutadiene, the compatibility with polyurethane resin is enhanced by adding silane coupling agent, the gap between the doctor blade and the top of the underlying abrasive layer is set to 30±2 μm, and zinc stearate lubricant is further added into the elastic intermediate isolation layer.
5. The method according to claim 1, wherein in the step S4, the waveform of the pulse electric field is set to be a square wave, the second abrasive generates a reciprocating oscillating motion under the action of the pulse electric field, and then a discontinuous distribution state with random intervals is formed on the surface of the middle isolation layer, the second abrasive adopts a green silicon carbide abrasive, the frequency of the pulse electric field is synchronously locked with the running speed of the production line, and the arrangement period of the second abrasive in the longitudinal direction is controlled by adjusting the proportional relation between the frequency and the speed.
6. A method for producing coated abrasive having a gradient of particle size distribution according to claim 1, wherein the preset temperature rise profile of the step-temperature-controlled drying apparatus in step S5 includes a first step of raising the temperature from room temperature to 60 ℃ for 30 minutes, a second step of raising the temperature from 60 ℃ to 90 ℃ for 40 minutes, and a third step of raising the temperature to 110-115 ℃ for 120-150 minutes.

Description

Sand paper production method with gradient particle size abrasive distribution Technical Field The invention relates to the technical field of sand paper production, in particular to a sand paper production method with gradient particle size abrasive distribution. Background The surface treatment technology is a key link for improving the appearance quality and the functional characteristics of products in the manufacturing industry, and is widely applied to the fields of wood processing, metal precision grinding, composite material finishing and the like. As a core tool for surface treatment, the coated abrasive tool realizes cutting and polishing of the surface of a workpiece by bonding an abrasive material on a flexible substrate, and the performance of the coated abrasive tool directly determines the machining efficiency, the surface roughness and the production cost, so that the coated abrasive tool is an essential consumable in modern precision manufacturing and manual machining. Among them, sandpaper is a typical coated abrasive, and the distribution state and particle size combination of the abrasive on the surface are the core factors for determining the grinding performance. To meet the processing requirements of the different stages, sandpaper is generally designed to have a specific particle size specification, and the basic goal of rapidly removing the surplus in the rough grinding stage and improving the surface finish in the finish grinding stage is achieved through the arrangement and consolidation of abrasive particles on a substrate, so that the surface of a workpiece is ensured to reach a preset process standard. The prior sand paper production technology and the product structure mainly have the following defects. Firstly, the configuration mode of the abrasive is single, and uniform arrangement of single particle size is adopted, so that sand paper with different meshes must be frequently replaced when complex workpieces are processed, and the continuity and the processing efficiency of the working procedure are seriously affected. Secondly, in the continuous grinding process of the abrasive paper with single particle size, abrasive dust is easy to fill gaps among the abrasive materials, so that slipping failure phenomenon is caused, and the effective utilization rate of the abrasive paper is greatly reduced. And when the complex curved surface with the coating is processed, the traditional sand paper has difficulty in maintaining high cutting force and simultaneously has surface precision, and local overgrinding or workpiece damage is extremely easy to cause. Finally, most of the existing mixed sand paper is simply physically doped, lacks a logic structure capable of automatically switching cutting modes according to the abrasion state, and is difficult to adapt to the severe requirements of modern industry on long service life and gradient cutting. These problems together lead to technical problems to be solved urgently, such as high paper changing frequency, large material loss, poor consistency of processing quality and the like in surface treatment operation. Disclosure of Invention The invention aims to provide a sand paper production method with gradient particle size abrasive distribution, which solves the problems in the background technology. In order to solve the technical problems, the invention provides the following technical scheme: A method for producing sandpaper with gradient particle size abrasive distribution, comprising the following steps: 1. A method for producing sandpaper with gradient particle size abrasive distribution, comprising the steps of: S1, performing primer construction, namely uniformly coating modified phenolic resin primer on the surface of a latex paper substrate treated by an oil penetration prevention process by using precise roller coating equipment comprising a metering mechanism and a coating mechanism, wherein the modified phenolic resin primer contains a rubber modified component and an active filling component, and coating the modified phenolic resin primer by adjusting the roller speed ratio to form a primer coating with bonding strength on the surface of the substrate; S2, performing bottom layer sand planting, namely starting a direct current electrostatic generator, regulating output voltage, constructing a high-voltage direct current electric field between polar plates, adsorbing a first abrasive to a primer coating by utilizing electric field force generated by the high-voltage electrostatic field, and guiding by the electric field force to enable the long axis of the first abrasive to be perpendicular to the plane direction of a latex paper base material so as to drive the tip of the abrasive to be embedded into the primer layer, thereby forming a bottom layer abrasive layer with high cutting characteristics; S3, constructing an intermediate isolation layer, namely sending a base material implanted with the abrasive into a drying de