Damping cloth for final polishing of optical elements and preparation process thereof

Abstract

The present invention discloses a damping cloth for final polishing of optical elements and a preparation process thereof, belonging to the technical field of damping cloth. A damping cloth for final polishing of optical elements comprises an elastic base layer, a water-repellent layer and an abrasive layer in sequence from the polishing contact surface to the adsorption surface. The water-repellent layer comprises a water-isolating layer and a buffer layer. The buffer layer is made of a polyurethane foam material containing modified glass powder, and the water-isolating layer is a polyurethane waterproof film. The present invention solves the problem that the surface of the existing damping cloth is prone to bacterial growth and mildew. The present invention proposes a damping cloth for final polishing of optical elements and a preparation process thereof. The elastic base layer adopts a structure in which an outer layer covers a fabric layer, thereby improving the flatness of the entire damping pad. The wood ash component in the modified glass powder can increase the alkalinity of the polishing liquid. The wood ash itself has a bactericidal effect, which can prevent the damping cloth from breeding bacteria and mildew, thereby improving the service life of the damping cloth.

Description

Technical Field

[0001] The present invention relates to the technical field of damping cloth, in particular to a damping cloth used for final polishing of optical elements and a preparation process thereof. Background Art

[0002] Damping cloth is a velvety polishing material with a fine texture, a soft, porous, elastic surface, and a long service life. It effectively absorbs abrasive fluid during polishing, increasing cutting force while preventing scratches on the workpiece. Damping cloth is suitable for final polishing of optical components, crystals, metals, and glass materials. It can also be used to polish specialized materials such as silicon, germanium, zinc selenide, gallium arsenide, alloy steel, ceramics, and plastics (acrylic glass). Existing damping cloth surfaces are prone to bacterial growth and mildew, resulting in a short service life. Furthermore, damping cloth surfaces are not smooth and flat, are of poor quality, and have poor water and stain resistance. Summary of the Invention

[0003] The purpose of the present invention is to provide a damping cloth for final polishing of optical elements and its preparation process. The structure of the outer layer covering the fabric layer in the elastic base layer is adopted, and the fabric layer uses fiber fabric soaked in elastic coating to increase the strength and elasticity of the fabric layer, thereby improving the flatness of the entire damping pad. Wood ash itself has a bactericidal effect, which can prevent the damping cloth from breeding bacteria and mildew, and increase the service life of the damping cloth, thereby solving the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A damping cloth for final polishing of optical elements comprises, in order from the polishing contact surface to the adsorption surface, an elastic base layer, a water-repellent layer and an abrasive layer. The water-repellent layer comprises a water-isolating layer and a buffer layer. The buffer layer is made of a polyurethane foam material containing modified vitreous powder. The water-isolating layer is a polyurethane waterproof film. The abrasive layer is made of the following raw materials in parts by weight: 15-20 parts of submicron cerium oxide, 0.5-3 parts of zirconium oxide, 1-2 parts of chromium oxide, 2-5 parts of rare earth, 1-2 parts of silicon dioxide and 4-8 parts of cobalt.

[0006] Preferably, the elastic base layer includes a fabric layer and an outer covering layer, and the fabric layer is placed in the outer covering layer. The preparation method of the elastic base layer is as follows: immerse the fiber fabric in the elastic coating, repeatedly squeeze it, take out the fiber fabric immersed in the elastic coating, and squeeze out the excess elastic coating, dry it at 60°C to obtain the fabric layer, pour a layer of polyurethane foam material on the surface of the fabric layer, after pouring into a film, cure it at 105°C for 30 minutes, demold it, transfer it into a drying oven, heat it to 50-60°C and pre-dry it for 20-30 minutes, then heat it to 80-85°C and dry it for 60-80 minutes to obtain the finished elastic base layer.

[0007] Preferably, the fiber fabric is a blend of polyurethane fiber, polyester fiber and aramid fiber, plain woven with a warp density and a weft density of 40 yarns / cm.

[0008] Preferably, the elastic coating comprises the following raw materials in parts by weight: 30-35 parts of polyurethane, 12-26 parts of styrene-butadiene rubber, 5-10 parts of graphite, 2-8 parts of acrylate, 1-3 parts of leveling agent, 10-30 parts of curing agent and 1-6 parts of propylene glycol.

[0009] Preferably, the preparation method of the buffer layer is as follows: the esterified palm fiber and the modified glass powder are fully stirred at room temperature, toluene diisocyanate, polytetramethylene ether glycol, deionized water, silicone oil, stannous octoate and triethylenediamine are mixed at room temperature, and added to the mixed material of the esterified palm fiber and the modified glass powder, and then vacuum degassed for 30 minutes and kept warm at 60°C. After casting into a film, it is cured at 105°C for 30 minutes, demolded, matured at 105°C for 15 hours, and stored at room temperature to form a buffer layer.

[0010] Preferably, the buffer layer comprises the following raw materials in parts by weight: 5-8 parts of esterified palm fiber, 3-6 parts of modified glass powder, 30-40 parts of toluene diisocyanate, 90-110 parts of polytetramethylene ether glycol, 1-4 parts of deionized water, 0.8-1.2 parts of silicone oil, 0.1-0.5 parts of stannous octoate and 0.05-0.2 parts of triethylenediamine.

[0011] Preferably, the esterification method of the esterified palm fiber is as follows: palm sheath fiber sheets are subjected to alkali washing treatment to obtain alkali-treated palm fibers, which are then broken up and combed to decompose into palm fiber monofilaments, and methanol and concentrated sulfuric acid are added to the palm fiber monofilaments to mix and carry out esterification reaction to obtain esterified palm fibers.

[0012] Preferably, the preparation method of the modified glass powder is as follows:

[0013] After mixing wood ash and clean water in a ratio of 1:100, let it stand for about 2 hours, take the precipitate to dry, and crush it into nano-wood ash powder; then take wood ash, quartz sand, attapulgite and lime and mix them evenly, add the nano-wood ash powder and add the mixture into a glass melting furnace, heat to a high temperature of 1530-1600℃, melt for 2-3 hours, then reduce the temperature to 1400-1450℃ and clarify for 1.5-2 hours to obtain glass liquid, which is then quenched in cold water to obtain crushed glass, and then ground into 3-5μm modified glass powder.

[0014] Preferably, the modified glass powder comprises the following raw materials in parts by weight: 12-15 parts of nano-wood ash powder, 15-22 parts of wood ash, 45-65 parts of quartz sand, 12-15 parts of attapulgite and 15-18 parts of lime, and the wood ash is made by burning at least one of rice straw, wheat stalks and peanut shells.

[0015] Another technical problem to be solved by the present invention is to provide a preparation process of a damping cloth for final polishing of optical elements, comprising the following steps:

[0016] S1: Apply a layer of polyurethane waterproof coating on the surface of the elastic base layer, adhere the prepared buffer layer to the polyurethane waterproof coating, and wait for the polyurethane waterproof coating to dry to form a waterproof layer;

[0017] S2: Hot-coat the surface of the buffer layer with abrasives at a coating amount of 1.8-2.5 g / cm2, and then cool and solidify to obtain an abrasive layer. After cutting, a damping cloth for final polishing of optical components is obtained.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The elastic base layer adopts a structure in which an outer layer covers a fabric layer, and the fabric layer uses fiber fabric soaked in elastic coating to increase the strength and elasticity of the fabric layer, thereby improving the flatness of the entire damping pad. The set buffer layer is made of polyurethane foam material containing modified glass powder, and esterified palm fiber and modified glass powder are mixed. The esterified palm fiber is used to adsorb the modified glass powder and fix it on the palm fiber. The prepared polyurethane foam material absorbs the polishing liquid during polishing and dissolves the modified glass powder on the palm fiber. The wood ash component in the modified glass powder can increase the alkalinity of the polishing liquid and improve the polishing effect on the optical element. The modified glass powder itself can also play the role of polishing powder. The wood ash itself has a bactericidal effect, which can prevent the damping cloth from breeding bacteria and mildew, thereby increasing the service life of the damping cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the damping cloth used for final polishing of optical elements according to the present invention.

[0021] In the figure: 1, elastic base layer; 11, fabric layer; 12, outer cover layer; 2, water-repellent layer; 21, water-isolating layer; 22, buffer layer; 3, abrasive layer. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1:

[0024] In order to solve the problems of the existing damping cloth surface being easy to breed bacteria and mildew, having a short service life, and the damping cloth surface being not flat and smooth, of poor quality, and having poor waterproof and antifouling properties, please refer to Figure 1 , this embodiment provides the following technical solutions:

[0025] A damping cloth for final polishing of optical elements comprises, from the polishing contact surface to the adsorption surface, an elastic base layer 1, a water-repellent layer 2, and an abrasive layer 3. The water-repellent layer 2 comprises a water-isolating layer 21 and a buffer layer 22. The buffer layer 22 is made of a polyurethane foam material containing modified vitreous powder. The water-isolating layer 21 is a polyurethane waterproof film. The abrasive layer 3 is made of the following raw materials in parts by weight: 16 parts of submicron cerium oxide, 2 parts of zirconium oxide, 1 part of chromium oxide, 2 parts of rare earth, 2 parts of silicon dioxide, and 4 parts of cobalt.

[0026] The elastic base layer 1 includes a fabric layer 11 and an outer layer 12. The fabric layer 11 is placed in the outer layer 12. The preparation method of the elastic base layer 1 is as follows: immerse the fiber fabric in the elastic coating, repeatedly squeeze it, take out the fiber fabric immersed in the elastic coating, and squeeze out the excess elastic coating, dry it at 60°C to obtain the fabric layer 11, pour a layer of polyurethane foam material on the surface of the fabric layer 11, after pouring into a film, cure it at 105°C for 30 minutes, demold it, transfer it into a drying oven, heat it to 50-60°C and pre-dry it for 20-30 minutes, then heat it to 80-85°C and dry it for 60-80 minutes to obtain the finished elastic base layer 1.

[0027] The fiber fabric is a blend of polyurethane fiber, polyester fiber and aramid fiber, and is plain woven with a warp density and a weft density of 40 yarns / cm. The blend of polyurethane fiber, polyester fiber and aramid fiber makes the fiber fabric wrinkle-resistant and has good overall elasticity. In addition, after the elastic coating is absorbed by the fiber fabric, the elasticity is increased, and the strength of the fiber fabric can also be improved. The support of the outer layer 12 can improve the corrosion resistance of the fabric layer 11 and improve its anti-aging ability.

[0028] The elastic coating comprises the following raw materials in parts by weight: 30 parts of polyurethane, 12 parts of styrene-butadiene rubber, 5 parts of graphite, 3 parts of acrylate, 2 parts of leveling agent, 12 parts of curing agent and 3 parts of propylene glycol.

[0029] The buffer layer 22 includes the following raw materials in parts by weight: 5 parts of esterified palm fiber, 3 parts of modified glass powder, 32 parts of toluene diisocyanate, 95 parts of polytetramethylene ether glycol, 3 parts of deionized water, 1 part of silicone oil, 0.3 parts of stannous octoate and 0.1 parts of triethylenediamine.

[0030] The preparation method of the buffer layer 22 is as follows: the esterified palm fiber and the modified glass powder are fully stirred at room temperature, toluene diisocyanate, polytetramethylene ether glycol, deionized water, silicone oil, stannous octoate and triethylenediamine are mixed at room temperature, and added to the mixed material of the esterified palm fiber and the modified glass powder, and then vacuum degassed for 30 minutes and kept warm at 60°C. After casting into a film, it is cured at 105°C for 30 minutes, demolded, matured at 105°C for 15 hours, and stored at room temperature to form the buffer layer 22.

[0031] The esterification method of esterified palm fiber is as follows: palm sheath fiber sheets are subjected to alkali washing treatment to obtain alkali-treated palm fiber, which is then broken up and combed to decompose into palm fiber monofilaments, and methanol and concentrated sulfuric acid are added to the palm fiber monofilaments to carry out esterification reaction to obtain esterified palm fiber.

[0032] The preparation method of the modified glass powder is as follows:

[0033] After mixing wood ash and water in a ratio of 1:100, the mixture is allowed to stand for about 2 hours, followed by drying the precipitate and grinding it into nano-scale wood ash powder. The mixture is then mixed with wood ash, quartz sand, attapulgite, and lime, and the nano-scale wood ash powder is added to the mixture. The mixture is then heated to 1530-1600°C for 2-3 hours, then lowered to 1400-1450°C for clarification for 1.5-2 hours to produce molten glass. This is then quenched in cold water to produce a crushed glass body, which is then ground into a 3-5 μm modified glass body powder. The wood ash, made from burned rice straw, wheat stalks, and peanut shells, contains a low content of phosphorus pentoxide. Water-soaking the ash removes most of the phosphorus pentoxide, reducing its toxicity and corrosiveness.

[0034] The modified glass powder includes the following raw materials in parts by weight: 12 parts of nano-wood ash powder, 15 parts of wood ash, 50 parts of quartz sand, 13 parts of attapulgite and 15 parts of lime.

[0035] In order to better illustrate the preparation process of the damping cloth for final polishing of optical components, this embodiment now proposes a preparation process of the damping cloth for final polishing of optical components, including the following steps:

[0036] Step 1: Apply a layer of polyurethane waterproof coating on the surface of the elastic base layer 1, adhere the prepared buffer layer 22 to the polyurethane waterproof coating, and wait for the polyurethane waterproof coating to dry to form a waterproof layer 21;

[0037] Step 2: hot-coat the surface of the buffer layer 22 with a coating amount of 1.8-2.5 g / cm2, then cool and solidify to obtain the abrasive layer 3. After cutting, the damping cloth for final polishing of optical elements is obtained.

[0038] Example 2:

[0039] In this embodiment, the buffer layer 22 includes the following raw materials in parts by weight: 6 parts of esterified palm fiber, 4 parts of modified glass powder, 32 parts of toluene diisocyanate, 95 parts of polytetramethylene ether glycol, 3 parts of deionized water, 1 part of silicone oil, 0.3 parts of stannous octoate and 0.1 parts of triethylenediamine.

[0040] The modified glass powder includes the following raw materials in parts by weight: 12 parts of nano-wood ash powder, 15 parts of wood ash, 50 parts of quartz sand, 13 parts of attapulgite and 15 parts of lime.

[0041] In this embodiment, the content of esterified palm fiber and modified glass powder is increased, and other materials are the same as those in Example 1. The method of Example 1 is used to prepare a damping cloth for final polishing of optical elements.

[0042] Example 3:

[0043] In this embodiment, the buffer layer 22 includes the following raw materials in parts by weight: 5 parts of esterified palm fiber, 3 parts of modified glass powder, 32 parts of toluene diisocyanate, 95 parts of polytetramethylene ether glycol, 3 parts of deionized water, 1 part of silicone oil, 0.3 parts of stannous octoate and 0.1 parts of triethylenediamine.

[0044] The modified glass powder includes the following raw materials in parts by weight: 15 parts of nano-wood ash powder, 18 parts of wood ash, 50 parts of quartz sand, 13 parts of attapulgite and 15 parts of lime.

[0045] In this embodiment, the content of nano-wood ash powder and wood ash is increased, and other materials are the same as those in Example 1. The method of Example 1 is used to prepare a damping cloth for final polishing of optical elements.

[0046] The modified glass powder comprises the following raw materials in parts by weight: 12-15 parts of nano-wood ash powder, 15-22 parts of wood ash, 45-65 parts of quartz sand, 12-15 parts of attapulgite and 15-18 parts of lime.

[0047] Example 4:

[0048] In this embodiment, the elastic coating comprises the following raw materials in parts by weight: 30 parts of polyurethane, 20 parts of styrene-butadiene rubber, 5 parts of graphite, 3 parts of acrylate, 2 parts of leveling agent, 12 parts of curing agent and 3 parts of propylene glycol.

[0049] In this embodiment, the content of styrene-butadiene rubber is increased, and the other components are the same as those in the first embodiment. The damping cloth for final polishing of optical elements is prepared by the method of the first embodiment.

[0050] Comparative Example 1:

[0051] In this comparative example, the modified glass powder component in the buffer layer 22 is removed, and the preparation method of the buffer layer 22 is as follows: toluene diisocyanate, polytetramethylene ether glycol, deionized water, silicone oil, stannous octoate and triethylenediamine are mixed at room temperature, and esterified palm fiber is added thereto, followed by vacuum degassing for 30 minutes, and keeping warm at 60°C. After casting into a film, it is cured at 105°C for 30 minutes, demolded, matured at 105°C for 15 hours, and stored at room temperature to form the buffer layer 22. The other components remain unchanged, and the material ratio of Example 1 is adopted, and the preparation method of Example 1 is used to prepare a damping cloth for the final polishing of optical elements.

[0052] Comparative Example 2:

[0053] In this comparative example, the elastic base layer 1 was prepared as follows: a layer of polyurethane foam was cast on the surface of the fabric layer 11. After the film was formed, it was cured at 105°C for 30 minutes, demolded, transferred to a drying oven, heated to 50-60°C for pre-drying for 20-30 minutes, and then heated to 80-85°C for drying for 60-80 minutes to obtain the finished elastic base layer 1. No elastic coating was used in this comparative example.

[0054] The proportions of other materials are the same as those in Example 1, and the method of Example 1 is used to prepare the damping cloth for final polishing of optical elements.

[0055] The damping fabrics prepared in Examples 1 to 4, Comparative Examples 1 and 2 were tested to obtain the following data:

[0056]

[0057]

[0058] It can be concluded from the above table that the elongation of the damping cloth prepared in each embodiment is higher than that in comparative example 2, because the elastic coating component is not used in comparative example 2, which indicates that the elastic coating can increase the elongation of the damping cloth, making the damping cloth more elastic. The surface sterilization rate of the damping cloth prepared in the embodiments is higher than that of the damping cloth in comparative example 1, because the damping cloth in comparative example 1 does not use the modified glass powder component, and the elongation of embodiment 4 is higher than that of other embodiments, which indicates that the increase in the content of styrene-butadiene rubber in the elastic coating can improve the overall elasticity of the damping cloth. In addition, the contents of modified glass powder and wood ash are increased in embodiments 2 and 3, respectively, and the damping cloth prepared has a better sterilization rate.

[0059] To sum up: the present invention proposes a damping cloth for final polishing of optical elements and its preparation process, the elastic base layer 1 adopts an outer layer 12 to cover the fabric layer 11, and the fabric layer 11 uses fiber fabric soaked in elastic coating to increase the strength and elasticity of the fabric layer 11, thereby improving the flatness of the entire damping pad, the buffer layer 22 is made of polyurethane foam material containing modified glass powder, and esterified palm fiber and modified glass powder are mixed, and the esterified palm fiber is used to adsorb the modified glass powder and fixed on the palm fiber. The prepared polyurethane foam material absorbs the polishing liquid during polishing and dissolves the modified glass powder on the palm fiber. The wood ash component in the modified glass powder can increase the alkalinity of the polishing liquid and improve the polishing effect on the optical element, and the modified glass powder itself can also play the role of polishing powder. The wood ash itself has a bactericidal effect, which can prevent the damping cloth from breeding bacteria and mildew, thereby improving the service life of the damping cloth.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A damping cloth for final polishing of optical elements, comprising an elastic base layer (1), a water-repellent layer (2) and an abrasive layer (3) in sequence from the polishing contact surface to the adsorption surface, characterized in that: The water-repellent layer (2) comprises a water-isolating layer (21) and a buffer layer (22), wherein the buffer layer (22) is made of a polyurethane foam material containing modified glass powder, the water-isolating layer (21) is a polyurethane waterproof membrane, and the abrasive layer (3) is made of the following raw materials in parts by weight: 15-20 parts of submicron cerium oxide, 0.5-3 parts of zirconium oxide, 1-2 parts of chromium oxide, 2-5 parts of rare earth, 1-2 parts of silicon dioxide, and 4-8 parts of cobalt; The elastic base layer (1) comprises a fabric layer (11) and an outer layer (12), wherein the fabric layer (11) is placed inside the outer layer (12). The elastic base layer (1) is prepared as follows: immersing the fiber fabric in the elastic coating, repeatedly squeezing the fiber fabric soaked in the elastic coating, and squeezing out the excess elastic coating, drying the fabric at 60°C to obtain the fabric layer (11), casting a layer of polyurethane foam material on the surface of the fabric layer (11), curing the film at 105°C for 30 minutes, demoulding, transferring the film into a drying oven, heating the film to 50-60°C for pre-drying for 20-30 minutes, and then heating the film to 80-85°C for drying for 60-80 minutes to obtain the finished elastic base layer (1); The preparation method of the buffer layer (22) is as follows: esterified palm fibers and modified glass powder are fully stirred at room temperature, toluene diisocyanate, polytetramethylene ether glycol, deionized water, silicone oil, stannous octoate and triethylene diamine are mixed at room temperature, and added to the mixed material of esterified palm fibers and modified glass powder, and then vacuum degassed for 30 minutes and kept warm at 60°C. After casting into a film, it is cured at 105°C for 30 minutes, demolded, aged at 105°C for 15 hours, and stored at room temperature to prepare the buffer layer (22); The preparation method of the modified vitreous powder is as follows: wood ash and clean water are mixed evenly in a ratio of 1:100, and the mixture is allowed to stand for 2 hours, followed by drying the precipitate and crushing it into nano-wood ash powder; wood ash, quartz sand, attapulgite and lime are then mixed evenly, and the nano-wood ash powder is added to the mixture, which is then added into a glass melting furnace, heated to a high temperature of 1530-1600°C, smelted for 2-3 hours, and then lowered to 1400-1450°C for clarification for 1.5-2 hours to obtain glass liquid, which is then quenched in cold water to obtain crushed vitreous body, and then ground into 3-5 μm modified vitreous powder.

2. The damping cloth for final polishing of optical elements according to claim 1, characterized in that: The fiber fabric is a blend of polyurethane fiber, polyester fiber and aramid fiber, and is plain woven with a warp density and a weft density of 40 yarns / cm.

3. The damping cloth for final polishing of optical elements according to claim 2, characterized in that: The elastic coating comprises the following raw materials in parts by weight: 30-35 parts of polyurethane, 12-26 parts of styrene-butadiene rubber, 5-10 parts of graphite, 2-8 parts of acrylate, 1-3 parts of leveling agent, 10-30 parts of curing agent and 1-6 parts of propylene glycol.

4. The damping cloth for final polishing of optical elements according to claim 3, characterized in that: The buffer layer (22) comprises the following raw materials in parts by weight: 5-8 parts of esterified palm fiber, 3-6 parts of modified glass powder, 30-40 parts of toluene diisocyanate, 90-110 parts of polytetramethylene ether glycol, 1-4 parts of deionized water, 0.8-1.2 parts of silicone oil, 0.1-0.5 parts of stannous octoate and 0.05-0.2 parts of triethylenediamine.

5. The damping cloth for final polishing of optical elements according to claim 4, characterized in that: The esterification method of the esterified palm fiber is as follows: palm sheath fiber sheets are subjected to alkali washing to obtain alkali-treated palm fibers, which are then broken up and combed to decompose into palm fiber monofilaments, and methanol and concentrated sulfuric acid are added to the palm fiber monofilaments for esterification reaction to obtain the esterified palm fiber.

6. The damping cloth for final polishing of optical elements according to claim 5, characterized in that: The modified glass powder comprises the following raw materials in parts by weight: 12-15 parts of nano-wood ash powder, 15-22 parts of wood ash, 45-65 parts of quartz sand, 12-15 parts of attapulgite and 15-18 parts of lime. The wood ash is made by burning at least one of rice straw, wheat stalks and peanut shells.

7. A process for preparing a damping cloth for final polishing of optical elements according to claim 6, characterized in that: The following steps are involved: S1: applying a layer of polyurethane waterproof coating on the surface of the elastic base layer (1), adhering the prepared buffer layer (22) to the polyurethane waterproof coating, and preparing a waterproof layer (21) after the polyurethane waterproof coating is dried; S2: Heat-coat the abrasive on the surface of the buffer layer (22) and control the coating amount to 1.8-2.5g / cm 2 , and then cooled and solidified to obtain an abrasive layer (3), which is then cut to obtain a damping cloth for final polishing of optical elements.

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