CN109759965B - Preparation method of high-flexibility high-hardness sand paper - Google Patents
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Abstract
The invention relates to a preparation method of high-flexibility high-hardness sand paper, belonging to the technical field of grinding materials. According to the method, birch wood chips and aluminum ions are mixed and hydrolyzed at high temperature and high pressure, so that hemicellulose, cellulose and lignin in the wood chips are separated, the hemicellulose, the cellulose and the lignin are high-molecular polysaccharide components, and are hydrolyzed under the high-temperature and high-pressure conditions, so that the flexibility and the surface mechanical strength of abrasive paper are improved.
Description
Technical Field
The invention relates to a preparation method of high-flexibility high-hardness sand paper, belonging to the technical field of grinding materials.
Background
Sandpaper is a paper with abrasive particles attached to it, and is used to level the surface of an article or to remove attachments (e.g., old paint) from the surface of an article, and sometimes to increase friction. The sandpaper is divided into different numbers according to different roughness degrees so as to match different purposes. Commonly known as sand skin. The base paper is usually sized with various abrasive grits.
There are various kinds of emery paper, artificial emery paper, glass emery paper, etc. depending on the kind of the abrasive substance. Dry abrasive paper (wood abrasive paper) is used to polish wood and bamboo surfaces. Water-resistant sandpaper (water sandpaper) is used to polish the surface of a metal or non-metal workpiece in water or oil. The base paper is made of unbleached sulfate wood pulp. The paper is tough, wear-resistant and folding-resistant, and has good water resistance. The paper is prepared by adhering ground substance such as glass sand to base paper with adhesive such as gum, and drying.
In actual use, the classification of sandpaper is very non-uniform. Sponge sand paper: is suitable for polishing the smooth part and can be made of various materials. The sponge sand paper sanding process has the characteristics of high production efficiency, good quality of the processed surface, low production cost and the like, and is widely applied to furniture production. Dry grinding of abrasive paper: the dry grinding abrasive paper uses synthetic resin as a binder to bond silicon carbide abrasive materials on latex, and is coated with an antistatic coating to prepare a high-grade product, and has the advantages of blockage prevention, static prevention, good flexibility, high wear resistance and the like. Grinding abrasive paper with water: the texture is fine, and the water-milled sand paper is suitable for polishing some objects with fine textures and is suitable for post-processing; the water-grinding abrasive paper has small gaps among sand grains and small ground powder, and when the water-grinding abrasive paper is used together with water, the ground powder flows out along with the water. Waterproof abrasive paper: waterproof abrasive paper is called water-sanding or water-sanding because it can be water-soaked and sanded when in use, and durable abrasive paper is called water-durable paper or sanded in water. According to the commodity name: wood sandpaper, i.e., dry-abrasive sandpaper; water-resistant sandpaper, i.e., waterproof sandpaper; the iron abrasive cloth is one of dry abrasive paper, is thick and can polish the metal surface as soon as possible.
For the abrasive paper products in the prior art, the defects of poor flexibility and poor hardness, which cause the abrasive paper to be not durable, easy to deform and rough in processed surface, commonly exist; the combination property of the polishing slurry is difficult to be suitable for fine grinding with high precision, such as finish machining of automobile crankshafts, automobile spray paint, electronics, compact discs and the like.
In the prior art, various abrasive grains are usually adhered to the surface of base paper or a plastic film, and for example, the patent literature discloses a moisture-proof abrasive paper which comprises a base layer with abrasive grains adhered to one surface, a waterproof layer adhered to the other surface of the base layer, and an abrasion-resistant layer adhered to the other surface of the waterproof layer; the middle part of the surface of the base layer is provided with a protruding part protruding outwards and used for separating the abrasive particles, and the abrasive particles on two sides of the protruding part are different in size. Because the surface of the base layer is separated from the abrasive particles through the convex parts, and the abrasive particles are different in size, the rough grinding and the fine grinding of the surface of the workpiece can be realized. Patent document a sponge abrasive paper, constitute including substrate, adhesive material and abrasive material, the substrate is the sponge class, adhesive material is epoxy modified resin, adopts sponge class substrate to compare in traditional sponge abrasive paper, have better pliability, be difficult for scraping the equipment that the flower was polished when using, especially have the equipment of polishing of unsmooth line to the surface, but this abrasive paper's intensity is not high, and abrasive paper's life is limited. The patent document describes a leather sandpaper comprising a leather layer, one side of which is coated with a layer of abrasive grains and the other side is coated with an adhesive layer. The utility model discloses a grinding sand grain has better pliability on arranging the leather in, nevertheless when polishing the concave-convex surface, and buffering effect is poor, and the effect of polishing is limited, and dull polish grain layer damages easily.
Therefore, it is necessary to develop a sand paper having high toughness and high hardness in the technical field of abrasive materials.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the defects of poor flexibility and poor hardness of the prior abrasive paper, which cause the abrasive paper to be not durable and easy to deform and damage, the preparation method of the abrasive paper with high flexibility and high hardness is provided.
In order to solve the technical problems, the invention adopts the technical scheme that:
a preparation method of high-flexibility high-hardness sand paper comprises the following steps: putting the screened product, butyl acrylate and distilled water into a blender, uniformly mixing to obtain blended slurry, making the blended slurry into pretreated base paper, putting the pretreated base paper into an oven, drying for 3-4 hours at the temperature of 60-70 ℃, and discharging to obtain high-flexibility and high-hardness abrasive paper;
the preparation method of the screened product comprises the following steps:
(1) putting the reaction slurry and hydrochloric acid into a beaker, putting the beaker into an ultrasonic oscillator, oscillating for 40-50 min under the condition that the frequency is 36-40 kHz to prepare a reaction liquid, adding copper powder with the mass of 6-8% of the reaction liquid into the beaker, and continuously oscillating for 3-4 h under the condition of 36-40 kHz to prepare a reaction mixed liquid;
(2) dropwise adding a sodium hydroxide solution into a beaker to adjust the pH value to 11-12, mixing and stirring for 60-80 min at the rotating speed of 500-600 r/min by using a stirrer, placing the beaker into a resistance heating sleeve after stirring, raising the temperature of the resistance heating sleeve to 90-100 ℃, and heating at constant temperature for 100-120 min to prepare a mixed emulsion;
(3) placing the beaker in a vacuum drying oven with the vacuum degree of 100-120 Pa and the temperature of 50-60 ℃, standing for 13-15 h at constant temperature and constant pressure, putting the dried material into a planetary ball mill, grinding for 2-3 h under the conditions that the ball-material ratio is 10:1 and the rotating speed is 80-100 r/min, and sieving with a 100-mesh sieve to obtain a sieved product;
the preparation method of the reaction slurry comprises the following steps:
(1) putting birch sawdust and distilled water into a beaker, mixing and stirring for 80-100 min at the rotating speed of 600-700 r/min by using a stirring device to prepare mixed slurry, putting aluminum chloride into the beaker, and continuously mixing and stirring for 30-40 min at the rotating speed of 600-700 r/min to prepare mixed dispersion liquid;
(2) and putting the mixed dispersion liquid and ammonia water into a reaction kettle, sealing the reaction kettle, filling argon into the reaction kettle, raising the pressure in the reaction kettle to 1.4-1.8 MPa, raising the temperature in the reaction kettle to 120-140 ℃, and carrying out constant-temperature and constant-pressure reaction for 80-100 min to obtain reaction slurry.
8-10 parts of a sieved product, 5-7 parts of butyl acrylate and 20-22 parts of distilled water.
Carbon powder with the mass of 3-5% of the pretreated base paper can be added into the blender to increase the hardness of the sand paper.
The mass ratio of the reaction slurry to the hydrochloric acid is 5:1, and the mass fraction of the hydrochloric acid is 12-16%.
The mass fraction of the sodium hydroxide solution is 10-12%.
The mass ratio of birch wood chips to distilled water is 1: 5.
the mass of the aluminum chloride put into the beaker is 4 to 6% of the mass of the mixed slurry.
The mass of the aluminum chloride is 4-6% of the mass of the mixed slurry.
The mass ratio of the mixed dispersion liquid to the ammonia water is 8: 1, the mass fraction of ammonia water is 14-18%.
The beneficial technical effects of the invention are as follows:
(1) the invention puts the birch wood chip into distilled water to be soaked, adds aluminum chloride and then stirs at high speed to prepare mixed dispersion, adds ammonia water into the mixed dispersion to carry out high-temperature high-pressure reaction, adds hydrochloric acid after the reaction to carry out ultrasonic oscillation, adds copper powder after the oscillation to be mixed and stirred to prepare reaction mixed liquid, adds alkali liquor to adjust the pH value, then raises the temperature and heats at constant temperature to prepare mixed emulsion, then concentrates, dries and grinds the mixed emulsion to prepare a screened product, finally mixes, manufactures and dries the screened product with acrylic latex distilled water to obtain the high-flexibility high-hardness abrasive paper, the invention mixes the birch wood chip with aluminum ions to carry out high-temperature high-pressure hydrolysis, separates hemicellulose, cellulose and lignin in the wood chip, the hemicellulose, the cellulose and the lignin are high molecular polysaccharide components, hydrolyzes under the high-temperature high-pressure condition, generates carboxyl groups on the surface of the fiber, complexing and adsorbing aluminum ions to enable the aluminum ions to be adsorbed on fiber molecules and lignin molecules, dropwise adding ammonia water to participate in reaction, introducing amino groups into fibers, forming more hydrogen bonds by utilizing the amino groups to adsorb, so that the crosslinking density of microstructures among all components is increased, the flexibility and the surface mechanical strength of the abrasive paper are improved, meanwhile, the roughness of the surface of the abrasive paper can be increased by the macromolecular fiber components, and the grinding capacity of the abrasive paper is improved by combining the hardness of the macromolecular fiber components;
(2) the invention introduces aluminum ions into organic components of hydrolyzed wood chips, then copper powder is added to form a displacement reaction, so that the aluminum ions are separated out in a simple substance form, grow on the surfaces of hemicellulose and lignin molecules, fill pores and fiber tubes, improve the mechanical strength of the fiber tubes, utilize the excellent rigidity, strength and flexibility of nano aluminum simple substance particles, further improve the hardness, flexibility and wear resistance of the abrasive paper, simultaneously fill the copper ions into the organic fiber components, perform complexation and adsorption on the surfaces of the organic fibers, generate a nano copper oxide component by using alkali liquor reaction and high-temperature water boiling, further fill the gaps among the fibers, and combine the rigidity and strength of the abrasive paper, thereby further enhancing the hardness and wear resistance of the abrasive paper, and having wide application prospect.
Detailed Description
Birch sawdust and distilled water are mixed according to the mass ratio of 1: 5, putting the mixture into a beaker, mixing and stirring the mixture for 80 to 100min by using a stirring device at the rotating speed of 600 to 700r/min to prepare mixed slurry, putting aluminum chloride accounting for 4 to 6 percent of the mass of the mixed slurry into the beaker, and continuously mixing and stirring the mixture for 30 to 40min at the rotating speed of 600 to 700r/min to prepare mixed dispersion liquid; mixing the mixed dispersion liquid with ammonia water with the mass fraction of 14-18% according to the mass ratio of 8: 1, putting the mixture into a reaction kettle, sealing the reaction kettle, filling argon into the kettle, raising the pressure in the kettle to 1.4-1.8 MPa, raising the temperature in the reaction kettle to 120-140 ℃, and carrying out constant-temperature and constant-pressure reaction for 80-100 min to obtain reaction slurry; putting the reaction slurry and hydrochloric acid with the mass fraction of 12-16% into a beaker according to the mass ratio of 5:1, putting the beaker into an ultrasonic oscillator, oscillating for 40-50 min under the condition of the frequency of 36-40 kHz to prepare a reaction solution, adding copper powder with the mass of 6-8% of the reaction solution into the beaker, and continuing oscillating for 3-4 h under the condition of 36-40 kHz to prepare a reaction mixed solution; dropwise adding 10-12% by mass of sodium hydroxide solution into the beaker to adjust the pH value to 11-12, mixing and stirring for 60-80 min at a rotating speed of 500-600 r/min by using a stirrer, placing the beaker into a resistance heating sleeve after stirring, raising the temperature of the resistance heating sleeve to 90-100 ℃, and heating at a constant temperature for 100-120 min to obtain a mixed emulsion; placing the beaker in a vacuum drying oven with the vacuum degree of 100-120 Pa and the temperature of 50-60 ℃, standing for 13-15 h at constant temperature and constant pressure, putting the dried material into a planetary ball mill, grinding for 2-3 h under the conditions that the ball-material ratio is 10:1 and the rotating speed is 80-100 r/min, and sieving with a 100-mesh sieve to obtain a sieved product; putting 8-10 parts by weight of the sieved product, 5-7 parts by weight of butyl acrylate and 20-22 parts by weight of distilled water into a blender, uniformly mixing to obtain blended slurry, making the blended slurry into pretreated base paper, putting the pretreated base paper into an oven, drying for 3-4 hours at the temperature of 60-70 ℃, and discharging to obtain the high-flexibility high-hardness sand paper.
Example 1
Preparation of reaction slurry:
birch sawdust and distilled water are mixed according to the mass ratio of 1: 5, putting the mixture into a beaker, mixing and stirring the mixture for 80min by using a stirring device at the rotating speed of 600r/min to prepare mixed slurry, putting aluminum chloride accounting for 4 percent of the mass of the mixed slurry into the beaker, and continuously mixing and stirring the mixture for 30min at the rotating speed of 600r/min to prepare mixed dispersion liquid;
mixing the mixed dispersion liquid with ammonia water with the mass fraction of 14% according to the mass ratio of 8: 1, putting the mixture into a reaction kettle, sealing the reaction kettle, filling argon into the reaction kettle, raising the pressure in the reaction kettle to 1.4MPa, raising the temperature in the reaction kettle to 120 ℃, and carrying out constant-temperature and constant-pressure reaction for 80min to obtain reaction slurry.
Preparation of the sieved product:
putting the reaction slurry and hydrochloric acid with the mass fraction of 12% into a beaker according to the mass ratio of 5:1, putting the beaker into an ultrasonic oscillator, oscillating for 40min under the condition of the frequency of 36kHz to prepare reaction liquid, adding copper powder with the mass fraction of 6% of the reaction liquid into the beaker, and continuously oscillating for 3h under the condition of 36kHz to prepare reaction mixed liquid;
dropwise adding a sodium hydroxide solution with the mass fraction of 10% into the beaker to adjust the pH value to 11, mixing and stirring for 60min by using a stirrer at the rotating speed of 500r/min, placing the beaker into a resistance heating sleeve after stirring, raising the temperature of the resistance heating sleeve to 90 ℃, and heating at constant temperature for 100min to obtain a mixed emulsion;
and (3) placing the beaker in a vacuum drying oven with the vacuum degree of 100Pa and the temperature of 50 ℃, standing for 13h at constant temperature and pressure, putting the dried material into a planetary ball mill, grinding for 2h under the conditions that the ball-material ratio is 10:1 and the rotating speed is 80r/min, and sieving by a 100-mesh sieve to obtain a sieved product.
Preparing high-flexibility high-hardness sand paper:
putting 8 parts of the screened product, 5 parts of butyl acrylate and 20 parts of distilled water into a blender, uniformly mixing to obtain blended slurry, manufacturing the blended slurry into pretreated base paper, putting the pretreated base paper into an oven, drying for 3 hours at the temperature of 60 ℃, and discharging to obtain the high-flexibility high-hardness abrasive paper.
Example 2
Preparation of reaction slurry:
birch sawdust and distilled water are mixed according to the mass ratio of 1: 5, putting the mixture into a beaker, mixing and stirring the mixture for 90min by using a stirring device at the rotating speed of 650r/min to prepare mixed slurry, putting aluminum chloride accounting for 5 percent of the mass of the mixed slurry into the beaker, and continuously mixing and stirring the mixture for 35min at the rotating speed of 650r/min to prepare mixed dispersion liquid;
mixing the mixed dispersion liquid with 16% of ammonia water in a mass ratio of 8: 1, putting the mixture into a reaction kettle, sealing the reaction kettle, filling argon into the reaction kettle, raising the pressure in the reaction kettle to 1.6MPa, raising the temperature in the reaction kettle to 130 ℃, and carrying out constant-temperature and constant-pressure reaction for 90min to obtain reaction slurry.
Preparation of the sieved product:
putting the reaction slurry and 14% hydrochloric acid into a beaker according to the mass ratio of 5:1, putting the beaker into an ultrasonic oscillator, oscillating for 45min under the condition of 38kHz to prepare a reaction liquid, adding 7% copper powder by mass of the reaction liquid into the beaker, and continuously oscillating for 3.5h under the condition of 38kHz to prepare a reaction mixed liquid;
dropwise adding a sodium hydroxide solution with the mass fraction of 11% into the beaker to adjust the pH value to 11, mixing and stirring for 70min by using a stirrer at the rotating speed of 550r/min, placing the beaker into a resistance heating sleeve after stirring, raising the temperature of the resistance heating sleeve to 95 ℃, and heating at constant temperature for 110min to obtain a mixed emulsion;
and (3) placing the beaker in a vacuum drying oven with the vacuum degree of 110Pa and the temperature of 55 ℃, standing for 14h at constant temperature and pressure, putting the dried material into a planetary ball mill, grinding for 2.5h under the conditions that the ball-material ratio is 10:1 and the rotating speed is 90r/min, and sieving with a 100-mesh sieve to obtain a sieved product.
Preparing high-flexibility high-hardness sand paper:
and (2) putting 9 parts of the screened product, 6 parts of butyl acrylate and 21 parts of distilled water into a blender, uniformly mixing to obtain blended slurry, making the blended slurry into pretreated base paper, putting the pretreated base paper into an oven, drying for 3.5 hours at the temperature of 65 ℃, and discharging to obtain the high-flexibility high-hardness abrasive paper.
Example 3
Preparation of reaction slurry:
birch sawdust and distilled water are mixed according to the mass ratio of 1: 5, putting the mixture into a beaker, mixing and stirring the mixture for 850min by using a stirring device at the rotating speed of 650r/min to prepare mixed slurry, putting aluminum chloride accounting for 5 percent of the mass of the mixed slurry into the beaker, and continuously mixing and stirring the mixture for 35min at the rotating speed of 650r/min to prepare mixed dispersion liquid;
mixing the mixed dispersion liquid with 16% of ammonia water in a mass ratio of 8: 1, putting the mixture into a reaction kettle, sealing the reaction kettle, filling argon into the reaction kettle, raising the pressure in the reaction kettle to 1.6MPa, raising the temperature in the reaction kettle to 130 ℃, and carrying out constant-temperature and constant-pressure reaction for 90min to obtain reaction slurry.
Preparation of the sieved product:
putting the reaction slurry and 14% hydrochloric acid into a beaker according to the mass ratio of 5:1, putting the beaker into an ultrasonic oscillator, oscillating for 45min under the condition of 38kHz to prepare a reaction liquid, adding 7% copper powder by mass of the reaction liquid into the beaker, and continuously oscillating for 3.5h under the condition of 38kHz to prepare a reaction mixed liquid;
dropwise adding a sodium hydroxide solution with the mass fraction of 11% into the beaker to adjust the pH value to 11, mixing and stirring for 70min by using a stirrer at the rotating speed of 550r/min, placing the beaker into a resistance heating sleeve after stirring, raising the temperature of the resistance heating sleeve to 95 ℃, and heating at constant temperature for 110min to obtain a mixed emulsion;
and (3) placing the beaker in a vacuum drying oven with the vacuum degree of 110Pa and the temperature of 55 ℃, standing for 14h at constant temperature and pressure, putting the dried material into a planetary ball mill, grinding for 2.5h under the conditions that the ball-material ratio is 10:1 and the rotating speed is 90r/min, and sieving with a 100-mesh sieve to obtain a sieved product.
Preparing high-flexibility high-hardness sand paper:
and (2) putting 9 parts of the screened product, 6 parts of butyl acrylate and 21 parts of distilled water into a blender, uniformly mixing to obtain blended slurry, making the blended slurry into pretreated base paper, putting the pretreated base paper into an oven, drying for 3.5 hours at the temperature of 65 ℃, and discharging to obtain the high-flexibility high-hardness abrasive paper.
Comparative example 1: essentially the same procedure as in example 2 was followed except that the reaction slurry was absent.
Comparative example 2: essentially the same procedure was followed as in example 2, except that the sieved product was absent.
Comparative example 3: high-flexibility and high-hardness sand paper produced by Shanghai company.
The cutting force test is carried out according to the GBT16458-2009 standard;
testing the folding endurance of the test piece according to GB/T457 in a toughness test;
testing the durability of the sand paper: the sandpaper of examples 1 to 3 and comparative example was used for crankshaft grinding, and after a period of use, it was observed whether the surface of the sandpaper was damaged or deformed.
TABLE 1 sandpaper Performance test results
| Test items | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Cutting force (g/min) | 1.87 | 1.90 | 1.92 | 1.21 | 1.43 | 1.48 |
| Transverse folding endurance (second) | 1509 | 1510 | 1512 | 1035 | 1056 | 1250 |
| Longitudinal folding endurance (times) | 1130 | 1133 | 1135 | 773 | 825 | 867 |
| Durability | Without damaging deformation | Without damaging deformation | Without damaging deformation | Damage and serious deformation | Damage, deformation | Damage, slight deformation |
According to the detection data, the high-flexibility and high-hardness abrasive paper prepared by the method has the advantages of high cutting force, high hardness, high folding resistance, good toughness, good durability, no damage or deformation, and wide application prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and as broadly as possible, and all changes, equivalents and modifications that fall within the true spirit and scope of the invention are therefore intended to be embraced therein.
Claims (8)
1. A preparation method of high-flexibility high-hardness sand paper is characterized by comprising the following specific preparation steps:
putting the screened product, butyl acrylate and distilled water into a blender, uniformly mixing to obtain blended slurry, making the blended slurry into pretreated base paper, putting the pretreated base paper into an oven, drying for 3-4 hours at the temperature of 60-70 ℃, and discharging to obtain high-flexibility and high-hardness abrasive paper;
the specific preparation steps of the screened product are as follows:
(1) putting the reaction slurry and hydrochloric acid into a beaker, putting the beaker into an ultrasonic oscillator, oscillating for 40-50 min under the condition that the frequency is 36-40 kHz to prepare a reaction liquid, adding copper powder with the mass of 6-8% of the reaction liquid into the beaker, and continuously oscillating for 3-4 h under the condition of 36-40 kHz to prepare a reaction mixed liquid;
(2) dropwise adding a sodium hydroxide solution into a beaker to adjust the pH value to 11-12, mixing and stirring for 60-80 min at the rotating speed of 500-600 r/min by using a stirrer, placing the beaker into a resistance heating sleeve after stirring, raising the temperature of the resistance heating sleeve to 90-100 ℃, and heating at constant temperature for 100-120 min to prepare a mixed emulsion;
(3) placing the beaker in a vacuum drying oven with the vacuum degree of 100-120 Pa and the temperature of 50-60 ℃, standing for 13-15 h at constant temperature and constant pressure, putting the dried material into a planetary ball mill, grinding for 2-3 h under the conditions that the ball-material ratio is 10:1 and the rotating speed is 80-100 r/min, and sieving with a 100-mesh sieve to obtain a sieved product;
the reaction slurry is prepared by the following specific steps:
(1) putting birch sawdust and distilled water into a beaker, mixing and stirring for 80-100 min at the rotating speed of 600-700 r/min by using a stirring device to prepare mixed slurry, putting aluminum chloride into the beaker, and continuously mixing and stirring for 30-40 min at the rotating speed of 600-700 r/min to prepare mixed dispersion liquid;
(2) and putting the mixed dispersion liquid and ammonia water into a reaction kettle, sealing the reaction kettle, filling argon into the reaction kettle, raising the pressure in the reaction kettle to 1.4-1.8 MPa, raising the temperature in the reaction kettle to 120-140 ℃, and carrying out constant-temperature and constant-pressure reaction for 80-100 min to obtain reaction slurry.
2. The method for preparing high-flexibility high-hardness sandpaper according to claim 1, wherein: preferably, the sieving product is 8-10 parts by weight, the butyl acrylate is 5-7 parts by weight, and the distilled water is 20-22 parts by weight.
3. The method for preparing high-flexibility high-hardness sandpaper according to claim 1, wherein: carbon powder accounting for 3-5% of the mass of the pretreated base paper can be added into the blender to increase the hardness of the sand paper.
4. The method for preparing high-flexibility high-hardness sandpaper according to claim 1, wherein: the specific preparation step of the screened product is that the mass ratio of the reaction slurry to the hydrochloric acid in the step (1) is 5:1, and the mass fraction of the hydrochloric acid is 12-16%.
5. The method for preparing high-flexibility high-hardness sandpaper according to claim 1, wherein: the specific preparation step of the screened product is that the mass fraction of the sodium hydroxide solution in the step (2) is 10-12%.
6. The method for preparing high-flexibility high-hardness sandpaper according to claim 1, wherein: the mass ratio of birch wood chips to distilled water in the specific preparation step (1) of the reaction slurry is 1: 5.
7. the method for preparing high-flexibility high-hardness sandpaper according to claim 1, wherein: specifically, in the step (1) of preparing the reaction slurry, the mass of the aluminum chloride charged into the beaker is 4 to 6% of the mass of the mixed slurry.
8. The method for preparing high-flexibility high-hardness sandpaper according to claim 1, wherein: the mass ratio of the mixed dispersion liquid and the ammonia water in the specific preparation step (2) of the reaction slurry is 8: 1, the mass fraction of ammonia water is 14-18%.
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