CN-122008096-A - High-resistance waterproof abrasive paper based on modified resin adhesive

CN122008096ACN 122008096 ACN122008096 ACN 122008096ACN-122008096-A

Abstract

The application relates to the technical field of grinding tool manufacturing, in particular to high-resistance waterproof abrasive paper based on a modified resin adhesive, which comprises an impregnated reinforced base paper layer, a primer layer, an abrasive layer and a compound adhesive layer. The abrasive paper is prepared by deep dipping base paper through epoxy modified acrylic emulsion and a silane coupling agent to form a double cross-linked network, wherein a primer layer adopts waterborne polyurethane, nano silicon dioxide and melamine formaldehyde condensate to improve heat hydrolysis resistance, and a compound layer adopts benzoxazine modified phenolic resin and epoxy soybean oil to cooperatively cure to construct a gradient cross-linked structure. The application can obviously improve the structural stability and the grinding performance retention rate of the sand paper under long-term soaking, high-temperature high-humidity and high-pressure water flow.

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: 20260312

Claims (9)

1. The preparation method of the high-resistance waterproof abrasive paper based on the modified resin adhesive is characterized by comprising the following steps of: S10, deep dipping treatment is carried out on a base material of the base paper, the base paper is completely immersed in dipping liquid composed of epoxy modified acrylic emulsion, a silane coupling agent KH560 and deionized water, vacuumizing is carried out for fifteen minutes to thirty minutes under the condition that the vacuum degree is minus eighty kilopascals to minus ninety kilopascals, then the base paper is continuously immersed for sixty minutes to one hundred twenty minutes under normal pressure, and the base paper is dried to constant weight under the condition that the base paper is eighty degrees to one hundred degrees centigrade after being taken out, so that the dipping reinforced base paper is obtained; S20, coating a primer layer on the impregnated reinforced base paper, wherein the primer layer consists of an aqueous polyurethane prepolymer, nano silicon dioxide sol, melamine formaldehyde condensate and a leveling agent BYK346, the solid content is controlled to be forty-five percent to fifty-five percent, the coating amount is twenty-five grams to thirty-five grams per square meter, and the primer layer is pre-dried for ten minutes to twenty minutes at ninety ℃ to one hundred and ten ℃ after coating; S30, planting sand on the primer layer, and planting silicon carbide or aluminum oxide abrasive materials on the surface of the primer layer in a vertical orientation mode by adopting an electrostatic sand planting process, wherein the sand planting density is three thousand five hundred grains to four thousand five hundred grains per square centimeter; s40, coating a compound adhesive layer on the surface of the sand-planted product, wherein the compound adhesive layer consists of benzoxazine modified phenolic resin, epoxidized soybean oil, ammonium persulfate initiator and defoaming agent Foamaster VL, the solid content is fifty percent to sixty percent, and the coating amount is forty grams to fifty grams per square meter; S50, placing the sand paper coated with the compound adhesive layer in a hot air circulation oven for sectional solidification, wherein the first stage is kept at one hundred twenty-hundred thirty ℃ for thirty minutes to forty-five minutes, the second stage is heated to one hundred sixty-hundred seventy ℃ to one hundred seventy ℃ for sixty minutes to ninety minutes, and the sand paper is rolled after being cooled, so that the high-waterproof sand paper is obtained.
2. The method for preparing high waterproof abrasive paper based on modified resin adhesive according to claim 1, wherein in step S10, the mass fraction of the epoxy modified acrylic emulsion in the impregnating solution is eight to twelve percent, the mass fraction of the silane coupling agent KH560 is zero to one point five percent, and the balance is deionized water.
3. The preparation method of the high-waterproof abrasive paper based on the modified resin adhesive, which is disclosed in claim 1, is characterized in that the preparation method of the epoxy modified acrylic emulsion comprises the steps of mixing butyl acrylate, methyl methacrylate and glycidyl acrylate according to a mass ratio of sixty to thirty, adding potassium persulfate accounting for three percent of the total mass of monomers as an initiator, reacting for four hours to six hours at seventy-five ℃ to eighty-five ℃ under the protection of nitrogen, and regulating the pH value to seven five to eight five by ammonia water after the reaction is finished to obtain the emulsion with the solid content of forty to fifty percent.
4. The method for preparing the high waterproof abrasive paper based on the modified resin adhesive according to claim 1, wherein in the step S20, the aqueous polyurethane prepolymer is prepared by reacting isophorone diisocyanate, polycaprolactone diol (number average molecular weight of two thousand) and dimethylolpropionic acid according to one mole ratio of isocyanate groups to hydroxyl groups, adding triethylamine to neutralize after the reaction is completed, and dispersing in deionized water, wherein the solid content is thirty percent to forty percent.
5. The method for preparing high waterproof abrasive paper based on modified resin adhesive according to claim 1, wherein in the step S20, the nano silica sol has a particle size of ten nm to thirty nm, a silica content of twenty to thirty percent by mass, and an addition amount thereof is five to ten percent by mass of the aqueous polyurethane prepolymer.
6. The method for preparing the high waterproof abrasive paper based on the modified resin adhesive according to claim 1, wherein in the step S20, the melamine formaldehyde condensate is prepared by condensing melamine and formaldehyde under an alkaline condition, the molar ratio is one to two and five, the reaction temperature is seventy degrees centigrade to eighty degrees centigrade, the reaction time is two hours to three hours, the obtained product is dehydrated and then added into a primer formula in a powder form, and the addition amount is three to seven percent of the mass of the aqueous polyurethane prepolymer.
7. The method for preparing the high-waterproof abrasive paper based on the modified resin adhesive according to claim 1, wherein in the step S40, the benzoxazine modified phenolic resin is prepared by mixing and melt blending bisphenol A type benzoxazine and linear phenolic resin according to a mass ratio, wherein the ring-opening polymerization temperature of the benzoxazine is more than one hundred and sixty degrees centigrade, and the hydroxymethyl content of the phenolic resin is controlled to be between eight moles and one point two moles of hydroxymethyl zero point contained in each hundred grams of resin.
8. The method for preparing the high-resistance waterproof abrasive paper based on the modified resin adhesive according to claim 1, wherein in the step S40, the epoxy value of the epoxidized soybean oil is three four to three eight zero, the addition amount of the epoxidized soybean oil is eight to twelve percent of the mass of the benzoxazine modified phenolic resin, and the addition amount of the ammonium persulfate initiator is five to one five percent of the mass of the benzoxazine modified phenolic resin.
9. The method for producing a modified resin adhesive-based high water-resistant coated abrasive according to claim 1, wherein the base paper substrate is bleached kraft pulp paper having a basis weight of one hundred twenty-ten grams per square meter to one hundred sixty grams per square meter, a longitudinal tensile strength of not less than three-point five kilonewtons per meter, and a transverse elongation of not more than one-five percent.

Description

High-resistance waterproof abrasive paper based on modified resin adhesive Technical Field The invention belongs to the technical field of grinding tool manufacturing, in particular relates to a preparation technology of waterproof abrasive paper in a coated grinding tool, and particularly relates to high-waterproof abrasive paper based on a modified resin adhesive. Background The waterproof abrasive paper is used as an important coated abrasive tool and is widely applied to wet grinding and polishing operations of materials such as metal, wood, plastic and the like. The core performance indexes of the polishing slurry comprise water resistance, flexibility, grinding efficiency and service life. In order to achieve excellent water resistance, the prior art generally employs a resin adhesive to treat a sandpaper substrate and to secure abrasive particles through a make layer and a size layer. In recent years, along with the stringent environmental regulations and the rising of high performance requirements, the aqueous resin system gradually replaces the traditional solvent type adhesive, and becomes an important direction for developing waterproof abrasive paper. Patent CN101623853B discloses a full resin waterproof abrasive paper, the structure of which is composed of six layers, which are sequentially an abrasive layer, an adhesive layer, a basic adhesive layer, a sand surface treatment layer, an abrasive paper raw paper layer and a waterproof treatment layer from top to bottom. The adhesive layer adopts a mixture of urea-formaldehyde resin, iron oxide red and ammonium chloride, the basic adhesive layer adopts a mixture of water-soluble acrylic resin, amino resin, flour and iron oxide red, and the waterproof treatment layer adopts a mixture of nano-scale styrene-butadiene latex and penetrating agent JFS. The scheme abandons alkyd resin, adopts water-soluble resin completely, and realizes environmental protection and no pollution. However, the technology has obvious defects that although the urea-formaldehyde resin has certain bonding strength, the water resistance is poor, hydrolysis is easy to occur under the environment of long-term soaking or high temperature and high humidity, so that the adhesive layer is invalid, and meanwhile, the cost can be reduced by adding natural fillers such as flour into the basic adhesive layer, the compactness and weather resistance of the adhesive film can be obviously reduced, and the structural stability and the service life of the sand paper under the severe working condition are influenced. The patent CN112059935B discloses an environment-friendly waterproof abrasive paper and a preparation method thereof, and the environment-friendly waterproof abrasive paper structurally comprises base paper, a primer layer, an abrasive layer and a compound adhesive layer, wherein the primer layer adopts a modified polyurethane adhesive, and the compound adhesive layer adopts a modified phenolic resin adhesive. According to the scheme, the flexibility, the strength and the water resistance of the sand paper are improved through the synergistic effect of the two-component resin. However, the technology has the limitations that although the modified polyurethane improves the binding force, the modified polyurethane is not specially optimized for high tensile strength and wet state retention rate, so that the base material of the sand paper is easy to soften and deform in the continuous water grinding process, and the modified phenolic resin improves the flexibility of the compound adhesive layer, but the curing process of the modified phenolic resin usually needs higher temperature, and the residual hydroxymethyl can influence the long-term water resistance. In addition, the scheme does not carry out deep impregnation strengthening treatment on the base paper, only depends on surface gluing, and is difficult to realize high waterproof performance of the integral structure, and particularly under the condition of high-pressure water flow impact or long-time soaking, moisture can still permeate along fiber gaps, so that interlayer stripping or abrasive shedding is caused. In summary, although the existing waterproof abrasive paper technology advances in environmental protection and basic water resistance, there are still obvious short plates in terms of high tensile strength, wet dimensional stability, long-term water-soaking adhesion retention rate, overall structural waterproof integrity and the like, and it is difficult to meet the severe requirements of the high-end manufacturing field on the high-performance waterproof abrasive tools. Therefore, there is a need to develop a high waterproof sandpaper based on a novel modified resin adhesive system, which has excellent dry/wet mechanical properties and long-term water resistance. Disclosure of Invention The invention provides a high-resistance waterproof abrasive paper based on a modified resin adhesive, and aims to solve the problem