CN114750083A - Damping cloth for ceramic fine polishing and production process thereof - Google Patents
Damping cloth for ceramic fine polishing and production process thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
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Abstract
The invention relates to damping cloth for ceramic fine polishing and a production process thereof, belonging to the technical field of damping cloth preparation. The damping cloth comprises a base layer and a polishing layer, wherein the polishing layer is made of modified polyurethane, and the modified polyurethane comprises the following raw materials: polyurethane prepolymer, modified epoxy resin, cross-linking agent and auxiliary agent. The modified epoxy resin contains hydroxyl and epoxy, the hydroxyl contained in the modified epoxy resin reacts with isocyanate groups in a polyurethane prepolymer system to generate crosslinking, the epoxy contained in the modified epoxy resin can be crosslinked with the hydroxyl in the polyurethane prepolymer or the hydroxyl on the surface of fibers in a base layer, so that the peeling strength between the base layer and a polishing layer is improved, in addition, in the preparation of the polishing layer, an auxiliary agent is introduced, the auxiliary agent is a porous polystyrene microsphere formed by emulsion polymerization of water silica, styrene and functional monomers, and double bonds contained on the surface of the porous polystyrene microsphere can also be crosslinked with double bonds in polypropylene fibers in the base layer.
Description
Technical Field
The invention belongs to the technical field of damping cloth preparation, and particularly relates to damping cloth for ceramic fine polishing and a production process thereof.
Background
Damping cloth is a velvet-like polishing material, and has fine texture, soft surface, multiple pores, elasticity and long service cycle. The grinding fluid can be effectively impregnated during grinding, so that the cutting force is improved, and the workpiece is prevented from being scratched. The damping cloth is suitable for final polishing of optical elements, crystals, metal and glass materials, and can also be used for polishing special materials, such as silicon, germanium, zinc selenide, gallium arsenide, alloy steel, ceramics and acrylic glass. The ceramic material is hard, and the requirement on the hardness of the damping cloth is high, so the damping cloth for ceramic fine polishing usually adopts hard polyurethane damping cloth. The rigid polyurethane damping cloth is generally composed of a base layer, an adhesive layer and a polishing layer. The multiple layers are easily separated under the action of friction force in the long-term use process, so that the function of the damping cloth is lost. Therefore, the bonding force among the multiple layers directly influences the service life of the damping cloth for ceramic fine polishing.
The adsorption pad for sapphire polishing and the preparation method thereof are disclosed in CN201510357286.3, wherein the adsorption pad sequentially comprises a damping cloth layer, a hot melt adhesive layer and an epoxy resin plate layer from one end to the other end in the thickness direction; and a plurality of through holes matched with the size of the sapphire substrate to be polished are formed in the hot melt adhesive layer and the epoxy resin plate layer. The epoxy resin plate is bonded with the damping cloth by the hot melt adhesive, and when the friction force is too large in the using stage, the epoxy resin plate and the damping cloth are easy to separate.
Therefore, the invention provides damping cloth for ceramic fine polishing and a production process thereof.
Disclosure of Invention
The invention aims to provide damping cloth for ceramic fine polishing and a production process thereof, so as to solve the problems in the background art.
The purpose of the invention can be realized by the following technical scheme:
a damping cloth for ceramic fine polishing comprises a base layer and a polishing layer.
Further, the base layer is formed by weaving PET fibers and polypropylene fibers, wherein the PET fibers account for 80-90% by weight, and the balance is the polypropylene fibers.
Further, the polishing layer is made of modified polyurethane, and the modified polyurethane comprises the following raw materials in parts by weight: 105-165 parts of polyurethane prepolymer, 21-34 parts of modified epoxy resin, 6-13 parts of cross-linking agent and 8-16 parts of auxiliary agent.
A production process of damping cloth for ceramic fine polishing comprises the following steps:
step one, blending PET fibers and polypropylene fibers to obtain a base layer;
heating the polyurethane prepolymer and the modified epoxy resin to be molten, then adding the cross-linking agent and the auxiliary agent, and stirring for 1-2min to obtain a molten material;
and step three, pouring the melt into a preheated mold, slowly cooling to 45 ℃, covering the base layer on the mixture, turning over the mold, carrying out hot pressing at 50-60 ℃, and trimming to obtain the damping cloth for ceramic fine polishing.
Further, the polyurethane prepolymer comprises diphenylmethane diisocyanate, polyethylene terephthalate and polybutylene succinate which are used as raw materials and are formed by polymerization, the polymerization temperature is controlled to be 80-90 ℃, the polymerization time is 2-4h, and the mass ratio of the diphenylmethane diisocyanate to the polyethylene terephthalate to the polybutylene succinate is 25-65:55-105: 25-45.
Further, the modified epoxy resin is prepared by the following steps:
step A1, adding maleic anhydride and tris (hydroxymethyl) aminomethane into a four-neck flask, adding ethanol, stirring uniformly, heating, refluxing and reacting for 10 hours, then cooling to room temperature, transferring the solution into a container, placing the container in an oven, and drying in vacuum at 35 ℃ to obtain a poly-hydroxycarboxylic acid compound, wherein the dosage ratio of the maleic anhydride, the tris (hydroxymethyl) aminomethane and the ethanol is 0.1-0.14mol:0.1mol: 150-; in the reaction, the trihydroxymethyl aminomethane and the maleic anhydride react, and the ring opening reaction of amino and anhydride ring is utilized to obtain a poly-hydroxycarboxylic acid compound, and the molecular structural formula of the poly-hydroxycarboxylic acid compound is shown as follows;
step A2, adding 2,4, 6-triaminopyrimidine, EDC, NHS and deionized water into a three-neck flask with a stirrer and a condensing device, stirring for 1h at room temperature, then adding a polyhydroxycarboxylic acid compound, adjusting the pH of a reaction solution to 5-6 with dilute hydrochloric acid, stirring for reacting for 12h at 35 ℃, filtering the reactant, repeatedly washing with deionized water for several times, and drying in vacuum to constant weight to obtain branched polyol, wherein the dosage ratio of the 2,4, 6-triaminopyrimidine, EDC, NHS, deionized water to the polyhydroxycarboxylic acid compound is 0.01 mol: 0.5-1.5 g: 0.6-1.2 g: 60-120 mL: 0.03 mol; in the reaction, 2,4, 6-triaminopyrimidine and polyhydroxy carboxylic acid compound react to obtain branched polyol by utilizing the reaction of amino and carboxyl, and the molecular mechanism formula of the branched polyol is shown as follows;
step A3, adding branched polyol and dewatered DMF (dimethyl formamide) into a three-neck flask with a stirrer and a reflux device in an ice water bath, then adding sodium hydride, stirring for 2 hours, then dripping epichlorohydrin, wherein the dripping speed is 1 drop/3 seconds, stirring and reacting for 4 hours after complete dripping, quenching with ice water after the reaction is finished, adjusting the pH of the solution to 7, performing rotary evaporation and drying to obtain the modified epoxy resin, wherein the dosage ratio of the branched polyol to the epichlorohydrin is 0.1mol: 0.4-0.65mol, and the adding mass of sodium hydride is 1-3% of the mass of the branched polyol. In the above reaction, the branched polyol and epichlorohydrin are subjected to substitution reaction of hydroxyl group and chlorohydrocarbon under alkaline condition to obtain modified epoxy resin, and in the above reaction process, the molar ratio of the branched polyol to the epichlorohydrin is controlled to make the obtained modified epoxy resin have epoxy group and hydroxyl group, and the modified epoxy resin also has a branched structure, the center of the branched structure is polyamide containing pyrimidine ring, and the branched structure is rigid inner core, and its outer layer is connected with ether chain, and is flexible chain, but the flexible chain is short, so the molecular rigidity of the modified epoxy resin is large.
Further, the auxiliary agent is prepared by the following steps:
adding hydrophobic silica and calcium carbonate into a mixed oil phase reaction bottle containing styrene and functional monomers, performing ultrasonic dispersion for 20-40min in an ice water bath to obtain a particle dispersion solution, then adding an initiator AIBN, stirring until the AIBN is completely dissolved, adding deionized water, stirring for 1-1.5h to obtain a suspension, heating to 75 ℃, reacting for 12h, then adding a hydrochloric acid solution, stirring and etching for 1h, washing with ethanol, centrifuging for several times, repeating the steps, and finally drying to constant weight to obtain an auxiliary agent, wherein the volume of the added deionized water is 4 times of the mass of the mixed oil phase, and the mass ratio of the hydrophobic silica, the calcium carbonate, the styrene and the functional monomers is 7-12: 11-20: 85-92: 8 to 15 percent, the added mass of AIBN is 1 to 3 percent of the mass of the mixed oil phase, and the particle size of calcium carbonate is 0.5 to 0.7 micron.
In the reaction process, styrene and functional monomers are taken as monomers of the capsule wall material, calcium carbonate is taken as a pore-forming agent, hydrophobic silicon dioxide is taken as a nucleating agent and a reinforcing agent of the capsule wall material, and then polymerization is carried out under the action of an initiator to obtain an auxiliary agent, wherein the auxiliary agent is a polystyrene porous microsphere, and the functional monomer containing a hindered phenol structure is introduced, so that the adsorption performance and the oxidation resistance of the polymer porous microsphere are realized.
Further, the functional monomer is an antioxidant with double bond end capping, and is prepared by the following steps:
adding hydroxypropyl acrylate, potassium carbonate and dimethyl sulfoxide into a three-neck flask with a stirring thermometer, slowly dropwise adding a dimethyl sulfoxide solution of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride at a dropwise speed of 1 drop/3 seconds in an ice-water bath at 0 ℃, heating to 45 ℃ after dropwise adding, reacting at a constant temperature for 12 hours, and distilling under reduced pressure to obtain a double-bond-terminated antioxidant, wherein the dosage ratio of hydroxypropyl acrylate, potassium carbonate, dimethyl sulfoxide and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride is 0.1mol: 0.2-0.23mol, 60-130 mL: 0.1 mol.
In the reaction, hydroxyl in the hydroxypropyl acrylate reacts with acyl chloride in the 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride, and the structure of hindered phenol is introduced into the molecular structure of the hydroxypropyl acrylate, so that the hydroxypropyl acrylate can capture free radicals, has antioxidant performance, and obtains the double-bond end-capped antioxidant.
The invention has the beneficial effects that:
in order to avoid the problem that the damping cloth is easy to delaminate in the using process, the inventor designs the delamination of the damping cloth from the following aspects: firstly, the base layer with good stiffness is used, wrinkling caused by insufficient stiffness of the base layer is prevented, and friction among multiple layers of damping cloth is increased, so that the PET fibers with good wrinkle resistance are used as basic fibers, the stiffness of the base layer is improved, and the friction among the multiple layers of damping cloth is reduced; secondly, the peeling strength between the base layer and the polishing layer is improved, on one hand, in the preparation of the base layer, polypropylene fiber is used for assisting in the preparation of the base layer, double bonds on the surface of the polypropylene fiber and double bonds in the polishing layer are crosslinked, so that the peeling strength between the base layer and the polishing layer is improved, on the other hand, most importantly, in the preparation of the polishing layer, modified epoxy resin is introduced, the molecular structure of the modified epoxy resin has a branched structure, the modified epoxy resin is uniformly dispersed in a polyurethane prepolymer system, hydroxyl contained in the modified epoxy resin can react with isocyanate groups in the polyurethane prepolymer to generate crosslinking, epoxy contained in the modified epoxy resin can be crosslinked with hydroxyl in the polyurethane prepolymer or hydroxyl on the surface of the base layer fiber, so that the peeling strength between the base layer and the polishing layer is improved, and in addition, in the preparation of the polishing layer, an auxiliary agent is introduced, and is hydrophobic silica, The surface of the porous polystyrene microsphere is provided with double bonds, and the double bonds can be crosslinked with the double bonds in the polypropylene fibers in the base layer;
in order to improve the polishing performance of the damping cloth, in the preparation process of the polishing layer, the branched structure of the modified epoxy resin is utilized, the crosslinking degree of a polyurethane system is improved, and the friction performance of the polyurethane system is improved; in addition, the addition of an auxiliary agent (polystyrene porous microspheres) improves the capability of polyurethane for adsorbing and transporting polishing solution and the oxidation resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparation of modified epoxy resin:
step A1, adding 0.1mol of maleic anhydride and 0.1mol of tris (hydroxymethyl) aminomethane into a four-neck flask, adding 150mL of ethanol, stirring uniformly, heating for reflux reaction for 10h, then cooling to room temperature, transferring the solution into a container, and placing the container in an oven for vacuum drying at 35 ℃ to obtain a poly-hydroxycarboxylic acid compound;
step A2, adding 0.01mol of 2,4, 6-triaminopyrimidine, 0.5g of EDC, 0.6g of NHS and 60mL of deionized water into a three-neck flask with a stirrer and a condensing device, stirring for 1h at room temperature, then adding 0.03mol of polyhydroxycarboxylic acid compound, adjusting the pH of a reaction solution to 5 by using 0.1M dilute hydrochloric acid, stirring for reacting for 12h at 35 ℃, filtering a reactant, repeatedly washing for several times by using deionized water, and drying in vacuum to constant weight to obtain branched polyol;
step A3, adding 0.1mol of branched polyol and 80mL of dewatered DMF into a three-necked bottle with a stirrer and a reflux device in an ice water bath, then adding 1% sodium hydride of the mass of the branched polyol, stirring for 2h, then dripping 0.4mol of epichlorohydrin, wherein the dripping speed is 1 drop/3 s, stirring for reacting for 4h after complete dripping, quenching with ice water after the reaction is finished, adjusting the pH of the solution to 7, performing rotary evaporation, and drying to obtain the modified epoxy resin.
Example 2
Preparation of modified epoxy resin:
step A1, adding 0.14mol of maleic anhydride and 0.1mol of tris (hydroxymethyl) aminomethane into a four-neck flask, adding 250mL of ethanol, stirring uniformly, heating for reflux reaction for 10h, then cooling to room temperature, transferring the solution into a container, and placing the container in an oven for vacuum drying at 35 ℃ to obtain a poly-hydroxycarboxylic acid compound;
step A2, adding 0.01mol of 2,4, 6-triaminopyrimidine, 1.5g of EDC, 1.2g of NHS and 120mL of deionized water into a three-neck flask with a stirrer and a condensing device, stirring for 1h at room temperature, then adding 0.03mol of polyhydroxycarboxylic acid compound, adjusting the pH of a reaction solution to 6 by using 0.1M dilute hydrochloric acid, stirring for reacting for 12h at 35 ℃, filtering a reactant, repeatedly washing for several times by using deionized water, and drying in vacuum to constant weight to obtain branched polyol;
step A3, adding 0.1mol of branched polyol and 80mL of dewatered DMF into a three-necked bottle with a stirrer and a reflux device in an ice water bath, then adding 3% of sodium hydride based on the mass of the branched polyol, stirring for 2h, then dripping 0.65mol of epoxy chloropropane at the dripping speed of 1 drop/3 s, stirring for reacting for 4h after complete dripping, quenching with ice water after the reaction is finished, adjusting the pH of the solution to 7, performing rotary evaporation, and drying to obtain the modified epoxy resin.
Example 3
Preparation of double bond-terminated antioxidant (functional monomer):
adding 0.1mol of hydroxypropyl acrylate, 0.2mol of potassium carbonate and 60mL of dimethyl sulfoxide into a three-neck flask with a stirring and thermometer, slowly dropwise adding 70mL of dimethyl sulfoxide solution containing 0.1mol of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride at the speed of 1 drop/3 seconds in an ice-water bath at the temperature of 0 ℃, heating to 45 ℃ after dropwise adding, reacting at constant temperature for 12 hours, and distilling under reduced pressure to obtain the antioxidant with double bond end capping.
Example 4
Preparation of double bond-terminated antioxidant (functional monomer):
adding 0.1mol of hydroxypropyl acrylate, 0.23mol of potassium carbonate and 130mL of dimethyl sulfoxide into a three-neck flask with a stirring and thermometer, slowly dropwise adding 70mL of dimethyl sulfoxide solution containing 0.1mol of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride at the speed of 1 drop/3 seconds in an ice-water bath at the temperature of 0 ℃, heating to 45 ℃ after dropwise adding, reacting at constant temperature for 12 hours, and distilling under reduced pressure to obtain the antioxidant with double bond end capping.
Example 5
Preparing an auxiliary agent:
adding 7g of hydrophobic silica and 11g of calcium carbonate into a mixed oil phase reaction bottle containing 85g of styrene and 8g of the functional monomer prepared in the embodiment 3, performing ultrasonic dispersion for 20min in ice-water bath to obtain particle dispersion, adding 1 wt% of AIBN (initiator) into the mixture, stirring the mixture until the AIBN is completely dissolved, adding deionized water into the mixture, stirring the mixture for 1H to obtain suspension, heating the suspension to 75 ℃, reacting the suspension for 12H, adding 1M hydrochloric acid solution (the dosage ratio of the reaction solution to the hydrochloric acid solution is controlled to be 1g:20mL), stirring and etching the mixture for 1H, washing the mixture by using ethanol, centrifuging the mixture for several times, and finally drying the mixture to constant weight to obtain an auxiliary agent, wherein the volume of the added deionized water is 4 times of the mass of the mixed oil phase, the hydrophobic silica is hydrophobic silica H30, and the particle size of the calcium carbonate is 0.5 +/-0.05 microns.
Example 6
Preparing an auxiliary agent:
12g of hydrophobic silica and 20g of calcium carbonate are added into a mixed oil phase reaction bottle containing 92g of styrene and 15g of the functional monomer prepared in the embodiment 4, ultrasonic dispersion is carried out for 40min under ice-water bath to obtain particle dispersion liquid, then 3 wt% of AIBN (initiator) is added, stirring is carried out until the AIBN is completely dissolved, then deionized water is added, stirring is carried out for 1.5H to obtain suspension, heating is carried out to 75 ℃, reaction is carried out for 12H, then 1M hydrochloric acid solution is added (the dosage ratio of the reaction liquid to the hydrochloric acid solution is controlled to be 1g:20mL), stirring and etching are carried out for 1H, washing and centrifugation are carried out for several times, and finally drying is carried out to constant weight to obtain the auxiliary agent, wherein the volume of the added deionized water is 4 times of the mass of the mixed oil phase, the hydrophobic silica is hydrophobic silica H30, and the particle size of the calcium carbonate is 0.7 +/-0.05 microns.
Example 7
Preparation of damping cloth for ceramic fine polishing:
step one, blending and weaving PET fibers and polypropylene fibers to obtain a base layer, wherein the PET fibers account for 80% and the polypropylene fibers account for 20% in percentage by weight;
step two, preparing the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 21 parts of modified epoxy resin prepared in example 1, 6 parts of crosslinking agent, 8 parts of auxiliary prepared in example 5
Step three, heating the polyurethane prepolymer and the modified epoxy resin to be molten, then adding the cross-linking agent and the auxiliary agent, and stirring for 2min to obtain a melt;
and step three, pouring the melt into a preheated mold, slowly cooling to 45 ℃, covering the base layer on the mixture, turning over the mold, carrying out hot pressing at 60 ℃, and trimming to obtain the damping cloth for ceramic fine polishing.
Example 8
Preparation of damping cloth for ceramic fine polishing:
step one, blending and weaving PET fibers and polypropylene fibers to obtain a base layer, wherein the PET fibers account for 85% and the polypropylene fibers account for 15% in percentage by weight;
step two, preparing the following raw materials in parts by weight: 135 parts of polyurethane prepolymer, 30 parts of modified epoxy resin prepared in example 1, 9 parts of crosslinking agent, 12 parts of auxiliary prepared in example 5
Step three, heating the polyurethane prepolymer and the modified epoxy resin to be molten, then adding the cross-linking agent and the auxiliary agent, and stirring for 2min to obtain a melt;
and step three, pouring the melt into a preheated mold, slowly cooling to 45 ℃, covering the base layer on the mixture, turning over the mold, carrying out hot pressing at 55 ℃, and trimming to obtain the damping cloth for ceramic fine polishing.
Example 9
Preparation of damping cloth for ceramic fine polishing:
step one, blending and weaving PET fibers and polypropylene fibers to obtain a base layer, wherein the PET fibers account for 90% and the polypropylene fibers account for 10% in percentage by weight;
step two, preparing the following raw materials in parts by weight: 165 parts of a polyurethane prepolymer, 34 parts of the modified epoxy resin prepared in example 1, 13 parts of a crosslinking agent, 16 parts of the auxiliary prepared in example 5;
step three, heating the polyurethane prepolymer and the modified epoxy resin to be molten, then adding the cross-linking agent and the auxiliary agent, and stirring for 1min to obtain a melt;
and step three, pouring the melt into a preheated mold, slowly cooling to 45 ℃, covering the base layer on the mixture, turning over the mold, carrying out hot pressing at 60 ℃, and trimming to obtain the damping cloth for ceramic fine polishing.
Comparative example 1
Compared with the example 7, the auxiliary agent in the raw material is deleted, and the rest is the same.
Comparative example 2
The same as in example 8, except that the modified epoxy resin in the raw materials was removed.
Comparative example 3
The modified epoxy resin was replaced with epoxy resin E51 in comparison with example 9, and the rest was the same.
Example 10
The damping cloths obtained in examples 7 to 9 and comparative examples 1 to 3 were subjected to the following performance tests:
the friction performance is as follows: a stainless steel metal block friction tester experiment under the pressure of 6kPa is adopted, and the friction depth after friction is counted;
the adhesive property is as follows: a tension experiment under the condition that the tension is 8kPa is adopted, and the separation time of the base layer and the polishing layer after the tension effect is counted;
the above test data are shown in table 1.
TABLE 1
| Depth of friction (micron) | Separation time(s) | |
| Example 7 | 2.2 | 140 |
| Example 8 | 2.3 | 142 |
| Example 9 | 2.4 | 143 |
| Comparative example 1 | 1.8 | 139 |
| Comparative example 2 | 1.9 | 89 |
| Comparative example 3 | 2.0 | 127 |
From the above data, it can be seen that the present invention provides damping cloth having excellent adhesion between layers, and excellent friction properties.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (8)
1. The utility model provides a damping cloth is used in ceramic fine polishing, includes basic unit and polishing layer, its characterized in that: the base layer is formed by spinning PET fibers and polypropylene fibers; the polishing layer is made of modified polyurethane, and the modified polyurethane comprises the following raw materials in parts by weight: 105-165 parts of polyurethane prepolymer, 21-34 parts of modified epoxy resin, 6-13 parts of cross-linking agent and 8-16 parts of auxiliary agent;
the modified epoxy resin is prepared by the following steps:
mixing the branched polyol and the dewatered DMF in an ice-water bath, adding sodium hydride, stirring for 2h, then dripping epichlorohydrin, stirring for reacting for 4h after complete dripping, and performing aftertreatment to obtain the modified epoxy resin.
2. The damping cloth for ceramic fine polishing as claimed in claim 1, wherein: the dosage ratio of the branched polyol to the epichlorohydrin is 0.1mol: 0.4-0.65 mol.
3. The damping cloth for ceramic fine polishing as claimed in claim 1, wherein: the branched polyol is prepared by the following steps:
stirring 2,4, 6-triaminopyrimidine, EDC, NHS and deionized water at room temperature for 1h, then adding a polyhydroxycarboxylic acid compound, adjusting the pH of a reaction solution to 5-6, stirring and reacting at 35 ℃ for 12h, and performing aftertreatment to obtain the branched polyol.
4. The damping cloth for ceramic fine polishing as claimed in claim 3, wherein: the dosage ratio of the 2,4, 6-triaminopyrimidine, EDC, NHS, deionized water and the polyhydroxycarboxylic acid compound is 0.01 mol: 0.5-1.5 g: 0.6-1.2 g: 60-120 mL: 0.03 mol.
5. The damping cloth for ceramic fine polishing as claimed in claim 3, wherein: the polyhydroxycarboxylic acid compound is prepared by the following steps:
mixing maleic anhydride and trihydroxymethyl aminomethane, adding ethanol, stirring, heating, refluxing for 10 hr, and post-treating to obtain polyhydroxycarboxylic acid compound.
6. The damping cloth for ceramic fine polishing as claimed in claim 5, wherein: the dosage ratio of the maleic anhydride, the tris (hydroxymethyl) aminomethane and the ethanol is 0.1-0.14mol:0.1mol:150-250 mL.
7. The damping cloth for ceramic fine polishing as claimed in claim 1, wherein: the auxiliary agent is prepared by the following steps:
adding hydrophobic silicon dioxide and calcium carbonate into a reaction bottle containing a mixed oil phase of styrene and a functional monomer, performing ultrasonic dispersion for 20-40min in an ice-water bath to obtain a particle dispersion liquid, then adding AIBN, stirring until the AIBN is completely dissolved, adding deionized water, stirring for 1-1.5h to obtain a suspension, heating to 75 ℃, reacting for 12h, and performing post-treatment to obtain the auxiliary agent.
8. The production process of the damping cloth for ceramic fine polishing as claimed in claim 1, wherein the production process comprises the following steps: the method comprises the following steps:
step one, blending PET fibers and polypropylene fibers to obtain a base layer;
heating the polyurethane prepolymer and the modified epoxy resin to be molten, then adding the cross-linking agent and the auxiliary agent, and stirring for 1-2min to obtain a molten material;
and step three, pouring the melt into a preheated mold, slowly cooling to 45 ℃, covering the base layer on the mixture, turning over the mold, carrying out hot pressing at 50-60 ℃, and trimming to obtain the damping cloth for ceramic fine polishing.
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