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CN-121973115-A - High-resistance layered grinding non-woven fabric

CN121973115ACN 121973115 ACN121973115 ACN 121973115ACN-121973115-A

Abstract

The application relates to the technical field of grinding tool manufacturing, and discloses a high-resistance layered grinding non-woven fabric which is prepared from pre-reacted ATBN modified phenolic resin, brown alumina abrasive, alcoholysis-resistant titanate coupling agent, hydrophobic fumed silica, polyvinyl butyral and a mixed solvent, wherein the resin is an interpenetrating network structure formed by pre-reacting and grafting amino-terminated liquid nitrile rubber and phenolic resin. The preparation method of the high-resistance layered grinding non-woven fabric comprises the steps of PVB premix liquid preparation, filler modified dispersion, resin compounding, slurry preparation, impregnation programmed temperature rising solidification and the like. According to the application, the fracture toughness of the bonding agent layer and the holding force of the abrasive are improved by constructing the resin interpenetrating network structure and cooperating with the interface for modification, so that the technical problems of high brittleness and easiness in layering and sand falling of the traditional phenolic-based abrasive are effectively solved.

Inventors

  • GUO JIONG
  • HE ZHENFENG
  • LIU JIAJIA
  • HAN LIXIANG
  • HE QIANG
  • GUO NAN

Assignees

  • 佳研新材料科技(重庆)有限公司

Dates

Publication Date
20260505
Application Date
20260316

Claims (10)

  1. 1. The high-resistance layered grinding non-woven fabric is characterized by being prepared from the following raw materials in parts by weight: 100 parts by weight of pre-reaction ATBN modified phenolic resin, wherein the pre-reaction ATBN modified phenolic resin is an interpenetrating network structure formed by grafting amino-terminated liquid nitrile rubber and phenolic resin through pre-reaction and is used for improving the holding force of a bonding agent layer on an abrasive and the shock resistance of the ground non-woven fabric; 200-300 parts by weight of brown corundum abrasive; 1.0-2.0 parts by weight of an alcoholysis-resistant titanate coupling agent; 0.5-2.0 parts by weight of hydrophobic fumed silica; 2.0-5.0 parts by weight of polyvinyl butyral; 15-30 parts of mixed solvent, wherein the mixed solvent is a mixture of absolute ethyl alcohol and n-butyl alcohol.
  2. 2. The high-resistance layered grinding non-woven fabric according to claim 1, wherein the raw materials are in parts by weight: 100 parts by weight of pre-reacted ATBN modified phenolic resin; 250 parts by weight of brown alumina abrasive; 1.5 parts by weight of an alcoholysis-resistant titanate coupling agent; 1.2 parts by weight of hydrophobic fumed silica; 3.5 parts by weight of polyvinyl butyral; 22 parts by weight of a mixed solvent.
  3. 3. The high-resistance layered ground non-woven fabric according to claim 1, wherein the pre-reacted ATBN modified phenolic resin is prepared from the following chemical raw materials in parts by weight: Phenol 100 parts by weight; 10.0-15.0 parts by weight of amino-terminated liquid nitrile rubber; 112-130 parts by weight of formaldehyde aqueous solution with concentration of 37 wt%; 1.5-2.0 parts by weight of barium hydroxide octahydrate; the pre-reaction temperature of the amino-terminated liquid nitrile rubber and phenol is 80-85 ℃, and the pre-reaction time is 40-60 min.
  4. 4. The high-resistance layered ground non-woven fabric according to claim 1, wherein the alcoholysis-resistant titanate coupling agent is isopropyl tri (dioctyl pyrophosphoryloxy) titanate, and the titanium content is 4.7wt% ± 0.2wt%.
  5. 5. The high-resistance layered grinding non-woven fabric according to claim 1, wherein the specific surface area of the hydrophobic fumed silica is 170+/-20 m 2 /g, and the surface of the hydrophobic fumed silica is chemically modified by dimethyl dichlorosilane.
  6. 6. The high-resistance layered grinding non-woven fabric according to claim 1, wherein the mass ratio of absolute ethyl alcohol to n-butyl alcohol in the mixed solvent is 1:1, the alumina content of the brown corundum abrasive is greater than or equal to 95.0%, and the brown corundum abrasive is subjected to high-temperature calcination treatment at 1050 ℃.
  7. 7. A method for preparing a high resistance layered ground nonwoven fabric according to any one of claims 1 to 6, comprising the steps of: s1, adding a mixed solvent into a stirring tank, adding polyvinyl butyral, heating to 40-50 ℃, and stirring at a temperature of between 40 and 50 ℃ until the polyvinyl butyral is completely dissolved to obtain transparent glue solution; s2, sequentially adding an alcoholysis-resistant titanate coupling agent and hydrophobic fumed silica into the transparent glue solution, and performing high-speed dispersion to obtain a dispersion liquid; S3, maintaining a stirring state, adding the pre-reaction ATBN modified phenolic resin into the dispersion liquid, and stirring and mixing to obtain a composite material; S4, adding brown corundum abrasive materials into the composite material in batches, and continuously stirring to prepare grinding coating slurry; S5, injecting the grinding coating slurry into a gum dipping tank, selecting non-woven fabrics as a matrix for dipping treatment, then sending the non-woven fabrics into a drying tunnel for programmed heating and solidification, and cooling and cutting to obtain the high-resistance layered grinding non-woven fabrics.
  8. 8. The method for preparing a layered ground non-woven fabric with high resistance according to claim 7, wherein in the step S2, the high-speed dispersion speed is 800-1200 r/min, and the dispersion time is 15-25 min.
  9. 9. The method for preparing the high-resistance layered grinding non-woven fabric according to claim 7, wherein in the step S5, the temperature programming and curing comprise a drying stage, a curing stage and a post-treatment stage, the temperature of the drying stage is 85-95 ℃ and the time is 30-40 min, the temperature of the curing stage is 105-115 ℃ and the time is 2.0-2.5 h, and the temperature of the post-treatment stage is 120-130 ℃ and the time is 1.0h.
  10. 10. The method for preparing the high-resistance layered grinding non-woven fabric according to claim 7, wherein the non-woven fabric is nylon 66 non-woven fabric, the unit gram weight is 150g/m 2 , and the sizing amount is controlled by a counter roller in the step S5.

Description

High-resistance layered grinding non-woven fabric Technical Field The invention relates to the technical field of grinding tool manufacturing, in particular to a high-resistance layered grinding non-woven fabric. Background The abrasive nonwoven fabric is widely used for surface grinding and polishing of metal and non-metal materials because of its open network structure and good flexibility. In the construction of abrasive nonwoven fabrics, the binder plays a key role in bonding the fiber network and holding the abrasive grains, and phenolic resins are currently used in industry as the main binder because of their excellent hardness and heat resistance after curing. However, the conventional phenolic resin has the defects of high crosslinking density, high brittleness, high internal stress and poor impact resistance after being cured. Under the working condition of heavy load or high-speed grinding, the adhesive layer with the hard and brittle characteristics cannot effectively buffer and dissipate mechanical stress, and brittle fracture is easily caused at the interface between the resin and the abrasive or fiber matrix. The interface failure is directly represented by microcrack of the grinding layer, so that the grinding material is initiated to fall off prematurely and the material structure is layered, the service life of the grinding non-woven fabric is greatly shortened, and the quality of the processing surface is affected. Although the brittleness can be reduced to a certain extent by the existing physical blending toughening modification method, the problem of poor compatibility of the modifier and the resin matrix is often faced, and the impact fracture resistance of the resin is difficult to be effectively improved while the high heat resistance and the high strength of the resin are maintained. Therefore, the invention provides a high-resistance layered grinding non-woven fabric to solve the defects in the prior art. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a high-resistance layered grinding non-woven fabric, which solves the problems that the adhesive layer is easy to crack, the holding force on the abrasive is reduced, the abrasive non-woven fabric is layered and sand falls off, and the high strength and the high toughness are difficult to be compatible under the working conditions of heavy load and high-speed grinding of the traditional phenolic resin-based grinding non-woven fabric due to the fact that the brittleness of a resin cured product is high and the internal stress is high. In order to solve the problems, the invention provides the following technical scheme: In a first aspect, the invention provides a high-resistance layered grinding non-woven fabric, which adopts the following technical scheme: The high-resistance layered grinding non-woven fabric is prepared from the following raw materials, by weight, 100 parts of pre-reaction ATBN modified phenolic resin, wherein the pre-reaction ATBN modified phenolic resin is an interpenetrating network structure formed by grafting amino-terminated liquid nitrile rubber and phenolic resin through pre-reaction and is used for improving the holding force of a bonding agent layer on an abrasive and the impact resistance of the grinding non-woven fabric, 200-300 parts of brown corundum abrasive, 1.0-2.0 parts of alcoholysis-resistant titanate coupling agent, 0.5-2.0 parts of hydrophobic fumed silica, 2.0-5.0 parts of polyvinyl butyral and 15-30 parts of mixed solvent, and the mixed solvent is a mixture of absolute ethyl alcohol and n-butyl alcohol. By adopting the technical scheme, the amino-terminated liquid nitrile rubber is utilized to carry out pre-reaction modification on the phenolic resin, and is matched with the synergistic effect of a plurality of auxiliary agents, so that the comprehensive performance of the ground non-woven fabric is improved, and the action mechanism is as follows: The toughening and reinforcing mechanism of the prereacted ATBN modified phenolic resin is that in the traditional physical blending modification, the compatibility of a rubber phase and a resin phase is poor, and macroscopic phase separation is easy to occur. Before formaldehyde is added, nucleophilic substitution reaction is carried out on the amino-terminated in the amino-terminated liquid nitrile rubber and the ortho-position or para-position active hydrogen on the benzene ring of phenol to form a graft copolymer precursor, then formaldehyde is added for polycondensation, and formaldehyde molecules form methylene bridge bonds to connect modified phenol and unmodified phenol. In the curing process, as the molecular weight increases, the flexible nitrile rubber chain segments and the rigid phenolic resin chain segments mutually penetrate and intertwine to form a microscopic phase separation structure in which the rubber phase is dispersed in the resin matrix. When the ground non-woven fabric is subjected to