CN110885622A - Sand paper hydrophilic coating - Google Patents

Sand paper hydrophilic coating Download PDF

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Publication number
CN110885622A
CN110885622A CN201911276671.XA CN201911276671A CN110885622A CN 110885622 A CN110885622 A CN 110885622A CN 201911276671 A CN201911276671 A CN 201911276671A CN 110885622 A CN110885622 A CN 110885622A
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abrasive
hydrophilic coating
hydrophilic
paper
coating
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Chinese (zh)
Inventor
方红
胡中平
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DONGGUAN GOLDEN SUN ABRASIVES Co Ltd
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DONGGUAN GOLDEN SUN ABRASIVES Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The invention relates to the technical field of grinding tool materials, in particular to a sand paper hydrophilic coating which comprises the following raw materials in parts by weight: 80-90 parts of abrasive, 10-20 parts of adhesive and 1-5 parts of hydrophilic auxiliary agent. The hydrophilic coating can improve the hydrophilicity of the coating layer by adopting the hydrophilic additive, and can be stably coated on the surface of the abrasive paper by matching with the adhesive, so that the formed hydrophilic coating can enable water to be uniformly infiltrated on the surface of the abrasive paper, ensure the abrasive paper to be uniformly wetted, increase the initial sharpness of the abrasive paper, polish the adhesive film on the surface of the abrasive layer, remove the adhesive film on the surface of the abrasive layer, improve the polishing effect of the abrasive paper, and simultaneously, the grinding material in the hydrophilic coating can pre-polish a workpiece, thereby improving the overall polishing effect of the abrasive paper, reducing the roughness of the polished surface of the workpiece, and enabling the prepared abrasive paper product to have the effects of hydrophilicity, grinding aid and blocking prevention.

Description

Sand paper hydrophilic coating
Technical Field
The invention relates to the technical field of abrasive tool materials, in particular to a hydrophilic coating for abrasive paper.
Background
Most of the prior sand paper is sand paper coated with mortar, and the adhesive component in the sand paper of the sand paper coated with the mortar can overflow due to the action of surface tension in the curing process, thereby forming a thin adhesive film layer on the surface of the sand paper. The cured adhesive film layer is not hydrophilic, and water cannot be uniformly infiltrated on the surface of the abrasive paper when the abrasive paper is used for wet grinding, so that the wet grinding effect is poor; in addition, the initial sharpness of the abrasive paper is poor, and the adhesive film layer can easily adsorb abrasive dust, so that the abrasive layer on the surface of the abrasive paper is blocked, and the polishing effect is reduced.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a hydrophilic coating for abrasive paper, which can be stably coated on the surface of the abrasive paper, and the formed hydrophilic coating can enable water to be uniformly soaked on the surface of the abrasive paper, so that the abrasive paper can be uniformly wetted, and the roughness of a workpiece polishing surface is reduced.
The invention also aims to provide a preparation method of the sand paper hydrophilic coating, which is simple to operate, easy to control, high in production efficiency and low in production cost, can ensure that the prepared sand paper hydrophilic coating has stable quality and better leveling property and ductility, and the formed hydrophilic coating can enable water to be uniformly infiltrated on the surface of the sand paper, so that the sand paper can be uniformly wetted, can play the effects of hydrophilicity, grinding aid and blocking prevention, reduces the roughness of a polished surface of a workpiece, and can be suitable for large-scale production.
The invention further aims to provide the hydrophilic abrasive paper, which can uniformly infiltrate water on the surface of the abrasive paper, has the effects of hydrophilicity, grinding aid and blocking prevention, reduces the roughness of a workpiece grinding surface and has long service life.
The purpose of the invention is realized by the following technical scheme: a hydrophilic coating for abrasive paper comprises the following raw materials in parts by weight:
80-90 parts of abrasive
10-20 parts of adhesive
1-5 parts of hydrophilic auxiliary agent.
According to the invention, the hydrophilic additive is adopted to prepare the coating layer on the surface of the abrasive paper, so that the hydrophilicity of the coating layer can be improved, moisture can be uniformly infiltrated on the surface of the abrasive paper, the abrasive paper is ensured to be uniformly wetted, the roughness of a workpiece grinding surface is reduced, and the adhesive component in the abrasive dust coating layer is prevented from being adsorbed on the surface of the coating layer through the infiltration effect, so that the anti-blocking effect is achieved, and the hydrophilic, grinding-assisted and anti-blocking effects of the abrasive paper product are obviously improved.
Traditional abrasive paper is in the preparation process, and the mortar layer that thoughtlessly has sand material and sizing material is when solidification shaping, because the sand material deposit in the mortar layer in the bottom, and the surface tension of sizing material makes the sizing material float in the surface of mortar layer, the glued membrane of formation for the sand material receives blockking of sizing material and influences its polishing to the work piece, and the effect of polishing is lower. Therefore, the invention arranges the hydrophilic coating on the surface of the sand paper (specifically the surface of the sand pulp layer) to increase the initial sharpness of the sand paper, so that when the sand paper is polished, the abrasive in the hydrophilic coating can polish the adhesive film on the surface of the sand pulp layer under the action of friction, remove the adhesive film on the surface of the sand pulp layer and improve the polishing effect of the sand material in the sand paper, and the abrasive in the hydrophilic coating can pre-polish the workpiece, thereby improving the polishing effect of the whole sand paper on the workpiece, wherein the abrasive particle size in the hydrophilic coating is smaller than the particle size of the sand material in the sand pulp by one, if the particle size of the sand pulp in the sand paper is 5 μm, the particle size of the abrasive in the hydrophilic coating is 3 μm, and if the particle size of the abrasive in the hydrophilic coating is equal to the particle size of the sand material in the sand pulp, or the particle size of the abrasive is larger than the particle size of the sand material, the workpiece can be greatly, and further, the roughness of the grinding surface of the workpiece is increased, and the surface grinding effect of the workpiece is influenced.
Preferably, the abrasive is alumina and/or silicon carbide. The abrasive material has high strength and strong bonding force with the adhesive, is not easy to fall off from the coating layer, avoids the influence of the fallen abrasive material on the workpiece such as scratches and the like, and has long service life. More preferably, the granularity of the abrasive is smaller than that of the sand used by the sand paper, if the granularity of the sand used by the sand paper is P1000, the granularity of the abrasive in the hydrophilic coating is P1200, so that the grinding damage of the abrasive to the workpiece caused by the larger granularity of the abrasive than the sand can be avoided, the roughness of the surface of the workpiece ground by the hydrophilic sand paper can be effectively reduced, and the phenomena of scratching, scratching and the like can be reduced.
Preferably, the adhesive is a polyurethane adhesive and/or an epoxy resin adhesive, has strong adhesive force, can be stably combined with an abrasive material, and has strong bonding force with the sand paper, so that the hydrophilic coating can be stably adhered to the surface of a sand paper sand pulp layer, is not easy to fall off, and the service life of a hydrophilic sand paper product is prolonged.
Preferably, the hydrophilic auxiliary agent is at least one of a mixture of sodium dodecyl sulfate and sodium oleate, fatty alcohol-polyoxyethylene ether AEO-7, sodium oleate and sodium dodecyl sulfate; the mixing weight ratio of the sodium dodecyl sulfate to the sodium oleate in the mixture of the sodium dodecyl sulfate and the sodium oleate is 40-50: 50-60.
The hydrophilic additive adopted by the invention can effectively improve the hydrophilicity of the hydrophilic coating, so that water can be uniformly infiltrated on the surface of the abrasive paper, the uniform wetting of the abrasive paper is ensured, the initial sharpness of the abrasive paper is increased, the roughness of the polished surface of a workpiece is reduced,
preferably, the abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid; the method has the advantages that the allyl alcohol polyoxyethylene ether is dissolved and dispersed by using deionized water, and then the dispersibility of the system is improved by using polyethylene glycol, so that the system is uniformly dispersed after the grinding material and calcium carbonate are subsequently added, the suspension property is good, agglomeration is not easy to generate, a sufficient contact area is further provided for the active group of the allyl alcohol polyoxyethylene ether to be grafted on the surface of the grinding material, the contact area of the allyl alcohol polyoxyethylene ether and the grinding material is not reduced due to material agglomeration, and the grafting rate is improved;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 15-20min, heating to 75-80 ℃, stirring for 25-30min under the irradiation of ultraviolet rays with the wavelength of 328-360nm, adding calcium carbonate, uniformly stirring to prepare a mixture, and preserving heat for 60-70 min; after the grinding material and the powder material of calcium carbonate are added, stirring at room temperature to improve the dispersibility of the material, then improving the temperature, promoting the active group of allyl alcohol polyoxyethylene ether to be grafted on the surface of the grinding material particles under the action of ultraviolet irradiation, finally performing heat preservation treatment to ensure the sufficiency of grafting reaction, simultaneously promoting the calcium carbonate to be adsorbed on the surface of the grinding material subjected to grafting modification treatment to form a physical adsorption layer, and improving the dispersibility of the grinding material in a coating system to ensure the grinding uniformity of the grinding material in the hydrophilic coating on a workpiece;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 75-80 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 15-20min after dropwise adding is finished, then cooling the reaction system to 40-55 ℃, and filtering, washing and drying to obtain the modified abrasive.
Preferably, in the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 15-18:30: 10-12; the polyethylene glycol has a relative molecular weight of 1500. The dispersibility of the system can be improved by strictly controlling the mixing proportion of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol, and the system can be uniformly dispersed with subsequent abrasives and calcium carbonate, is stable in suspension and is easy to graft; the polyethylene glycol with specific relative molecular weight is adopted, the compatibility and the compatibility with the allyl alcohol polyoxyethylene ether are good, and the dispersibility of the system can be effectively improved.
Preferably, in the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 18-22:3-8: 60;
preferably, in the step (3), the addition amount of the sodium sulfite is 3-10 wt% of the mixture.
The modified abrasive is modified by adopting the allyl alcohol polyoxyethylene ether, and the water-soluble polymer block of the allyl alcohol polyoxyethylene ether is grafted on the surface of abrasive particles, so that the hydrophilicity of the abrasive is improved, the dispersibility of the abrasive in a water-based coating is improved on one hand, the grinding uniformity of the abrasive in the water-based coating on a workpiece is ensured, the phenomena of uneven grinding, local abrasion and scratch and the like of the workpiece caused by uneven dispersion of the abrasive are avoided, the hydrophilicity of the abrasive in a coating is improved on the other hand, water can be uniformly soaked in the coating on the surface of the abrasive paper during wet grinding, and the wet grinding effect is good; wherein, the dispersibility of the predispersion is improved by polyethylene glycol, and the dispersibility of the predispersion to the grinding material is improved. Calcium carbonate is added after the grafting modification, and the calcium carbonate is adsorbed on the surface of the abrasive material after the grafting modification treatment to form a physical adsorption layer, so that the agglomeration of abrasive material powder is prevented, and the dispersibility of the abrasive material is improved; and finally, sodium sulfite is added for sulfonation reaction, so that the hydrophilicity of the grinding material is improved, and the hydrophilicity of the grinding material in the coating and the moisture wettability in the wet grinding process are promoted.
The abrasive material is modified by the method, so that the hydrophilicity of the abrasive material is improved, the surface energy of abrasive material particles is reduced, the dispersibility of the abrasive material particles is improved, the compatibility of the abrasive material and an adhesive is improved, the local scratch phenomenon of the workpiece caused by the uneven dispersion of the abrasive material is reduced, the wear resistance of the workpiece is enhanced, the modified abrasive material has good dispersibility in a hydrophilic coating, a better dispersion effect is achieved under the condition that no dispersant is added into the coating, and the workpiece is uniformly polished.
The other purpose of the invention is realized by the following technical scheme: the preparation method of the hydrophilic coating for the abrasive paper comprises the steps of mixing the materials in parts by weight, and uniformly dispersing the materials under the conditions that the rotating speed is 600-1000rpm to prepare the hydrophilic coating for the abrasive paper.
The preparation method of the hydrophilic coating for abrasive paper has the advantages of simple operation, easy control, high production efficiency and low production cost, can ensure that the prepared hydrophilic coating for abrasive paper has stable quality and better leveling property and ductility, can ensure that the surface of the hydrophilic coating is uniformly wetted by water, can achieve the effects of hydrophilicity, grinding aid and anti-blocking, reduces the roughness of the polished surface of a workpiece, and can be suitable for large-scale production.
The other purpose of the invention is realized by the following technical scheme: the hydrophilic sand paper comprises a substrate layer, a sand slurry layer coated on the upper surface of the substrate layer and a hydrophilic coating coated on the upper surface of the sand slurry layer, wherein the gram weight of the hydrophilic coating is 40-80g/m2The hydrophilic coating is formed by coating and curing a hydrophilic coating, and the hydrophilic coating is the sand paper hydrophilic coating.
The hydrophilic abrasive paper provided by the invention has the advantages that the water can be uniformly infiltrated on the surface of the abrasive paper, the hydrophilic, grinding-assisted and anti-blocking effects are realized, the roughness of the polished surface of a workpiece is reduced, and the service life is long.
The invention has the beneficial effects that: the hydrophilic coating can improve the hydrophilicity of the coating layer by adopting the hydrophilic additive, and can be stably coated on the surface of the abrasive paper by matching with the adhesive, so that the formed hydrophilic coating can enable water to uniformly infiltrate into the surface of the hydrophilic coating, the abrasive in the hydrophilic coating can ensure uniform wetting of the abrasive paper, the initial sharpness of the abrasive paper is increased, on one hand, the adhesive film on the surface of the abrasive layer is polished, the adhesive film on the surface of the mortar layer is removed, the polishing effect of the abrasive in the abrasive paper is improved, on the other hand, the abrasive in the hydrophilic coating can pre-polish the workpiece, the polishing effect of the abrasive paper on the workpiece is further improved, the roughness of the polished surface of the workpiece is reduced, and the prepared abrasive paper product has the effects of hydrophilicity, grinding aid and blocking prevention.
The preparation method of the hydrophilic coating for abrasive paper has the advantages of simple operation, easy control, high production efficiency and low production cost, can ensure that the prepared hydrophilic coating for abrasive paper has stable quality and better leveling property and ductility, can ensure that the surface of the hydrophilic coating is uniformly wetted by water, can achieve the effects of hydrophilicity, grinding aid and anti-blocking, reduces the roughness of the polished surface of a workpiece, and can be suitable for large-scale production.
The hydrophilic abrasive paper provided by the invention has the advantages that the water can be uniformly infiltrated on the surface of the abrasive paper, the hydrophilic, grinding-assisted and anti-blocking effects are realized, the roughness of the polished surface of a workpiece is reduced, and the service life is long.
Drawings
FIG. 1 is a partial cross-sectional view of a hydrophilic coated abrasive according to the present invention;
the reference signs are: 1-substrate layer 1, 2-mortar layer 2, 3-hydrophilic coating 3.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and the accompanying fig. 1, and the description of the embodiments is not intended to limit the present invention.
Example 1
A hydrophilic coating for sand paper is characterized in that: the feed comprises the following raw materials in parts by weight:
80 portions of grinding material
10 portions of adhesive
And 1 part of hydrophilic auxiliary agent.
The abrasive is alumina.
The adhesive is polyurethane adhesive.
The hydrophilic auxiliary agent is fatty alcohol-polyoxyethylene ether AEO-7, and the HLB value is 12.
The abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 15min, heating to 75 ℃, stirring for 30min under the irradiation of ultraviolet rays with the wavelength of 328nm, adding calcium carbonate, stirring uniformly to prepare a mixture, and keeping the temperature for 60 min;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 75 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 20min after dropwise adding is finished, then cooling the reaction system to 40 ℃, and filtering, washing and drying to obtain the modified abrasive.
In the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 15: 30: 12; the polyethylene glycol has a relative molecular weight of 1500.
In the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 18:8: 60.
In the step (3), the addition amount of the sodium sulfite is 3 wt% of the mixture.
The preparation method of the hydrophilic coating for the abrasive paper comprises the steps of mixing the materials in parts by weight, and uniformly dispersing the materials at the rotating speed of 600rpm to obtain the hydrophilic coating for the abrasive paper.
The utility model provides a hydrophilic abrasive paper, includes substrate layer 1, coat in the mortar layer 2 of 1 upper surface of substrate layer and coat in the hydrophilic coating 3 of 2 upper surfaces of mortar layer, the gram weight of hydrophilic coating 3 is 40g/m2The hydrophilic coating 3 is formed by coating and curing a hydrophilic coating, and the hydrophilic coating is the sand paper hydrophilic coating.
Example 2
A hydrophilic coating for sand paper is characterized in that: the feed comprises the following raw materials in parts by weight:
82 portions of abrasive
12 portions of adhesive
And 2 parts of a hydrophilic auxiliary agent.
The abrasive is silicon carbide.
The adhesive is an epoxy resin adhesive.
The hydrophilic auxiliary agent is sodium oleate, and the HLB value is 18.
The abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 16min, heating to 76 ℃, stirring for 28min under the irradiation of ultraviolet rays with the wavelength of 334nm, adding calcium carbonate, stirring uniformly to prepare a mixture, and keeping the temperature for 62 min;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 76 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 18min after dropwise adding is finished, then cooling the reaction system to 43 ℃, and filtering, washing and drying to obtain the modified abrasive.
In the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 16: 30: 11.5; the polyethylene glycol has a relative molecular weight of 1500.
In the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 19:6: 60.
In the step (3), the addition amount of the sodium sulfite is 5 wt% of the mixture.
The preparation method of the hydrophilic coating for the abrasive paper comprises the steps of mixing the materials in parts by weight, and uniformly dispersing the materials at the rotating speed of 700rpm to obtain the hydrophilic coating for the abrasive paper.
The utility model provides a hydrophilic abrasive paper, includes substrate layer 1, coat in the mortar layer 2 of 1 upper surface of substrate layer and coat in the hydrophilic coating 3 of 2 upper surfaces of mortar layer, the gram weight of hydrophilic coating 3 is 50g/m2The hydrophilic coating 3 is formed by coating and curing a hydrophilic coating, and the hydrophilic coating is the sand paper hydrophilic coating.
Example 3
A hydrophilic coating for sand paper is characterized in that: the feed comprises the following raw materials in parts by weight:
85 portions of grinding material
15 portions of adhesive
And 3 parts of a hydrophilic auxiliary agent.
The grinding material is a mixture of aluminum oxide and silicon carbide in a weight ratio of 1: 1.
The adhesive is a mixture of a polyurethane adhesive and an epoxy resin adhesive in a weight ratio of 1: 1.
The hydrophilic auxiliary agent is a mixture of sodium dodecyl sulfate and sodium oleate, wherein the mixing weight ratio of the sodium dodecyl sulfate to the sodium oleate is 40:60, and the HLB value is 30.
The abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 18min, heating to 77 ℃, stirring for 27min under the irradiation of ultraviolet rays with the wavelength of 342nm, adding calcium carbonate, stirring uniformly to prepare a mixture, and keeping the temperature for 65 min;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 77 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 17min after dropwise adding is finished, then cooling the reaction system to 48 ℃, and filtering, washing and drying to obtain the modified abrasive.
In the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 16.5: 30: 11; the polyethylene glycol has a relative molecular weight of 1500.
In the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 20:5: 60.
In the step (3), the addition amount of the sodium sulfite is 7 wt% of the mixture.
The preparation method of the hydrophilic coating for the abrasive paper comprises the steps of mixing the materials in parts by weight, and uniformly dispersing the materials at the rotating speed of 800rpm to obtain the hydrophilic coating for the abrasive paper.
The utility model provides a hydrophilic abrasive paper, includes substrate layer 1, coat in the mortar layer 2 of 1 upper surface of substrate layer and coat in the hydrophilic coating 3 of 2 upper surfaces of mortar layer, the gram weight of hydrophilic coating 3 is 60g/m2The hydrophilic coating 3 is formed by coating and curing a hydrophilic coating, and the hydrophilic coating is the sand paper hydrophilic coating.
Example 4
A hydrophilic coating for sand paper is characterized in that: the feed comprises the following raw materials in parts by weight:
88 portions of grinding material
18 portions of adhesive
And 5 parts of a hydrophilic auxiliary agent.
The grinding material is a mixture of aluminum oxide and silicon carbide in a weight ratio of 2: 1.
The adhesive is a mixture of a polyurethane adhesive and an epoxy resin adhesive in a weight ratio of 1: 2.
The hydrophilic auxiliary agent is a mixture of sodium dodecyl sulfate and sodium oleate, wherein the mixing weight ratio of the sodium dodecyl sulfate to the sodium oleate is 50:50, and the HLB value is 30.
The abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 19min, heating to 78 ℃, stirring for 26min under the irradiation of ultraviolet rays with the wavelength of 350nm, adding calcium carbonate, stirring uniformly to prepare a mixture, and keeping the temperature for 68 min;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 78 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 16min after dropwise adding is finished, then cooling the reaction system to 52 ℃, and filtering, washing and drying to obtain the modified abrasive.
In the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 17: 30: 10.5; the polyethylene glycol has a relative molecular weight of 1500.
In the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 21:4: 60.
In the step (3), the addition amount of the sodium sulfite is 8 wt% of the mixture.
The preparation method of the hydrophilic coating for the abrasive paper comprises the steps of mixing the materials in parts by weight, and uniformly dispersing the materials at the rotation speed of 900rpm to obtain the hydrophilic coating for the abrasive paper.
The utility model provides a hydrophilic abrasive paper, includes substrate layer 1, coat in the mortar layer 2 of 1 upper surface of substrate layer and coat in the hydrophilic coating 3 of 2 upper surfaces of mortar layer, the gram weight of hydrophilic coating 3 is 70g/m2The hydrophilic coating 3 is formed by coating and curing a hydrophilic coating, and the hydrophilic coating is the sand paper hydrophilic coating.
Example 5
A hydrophilic coating for sand paper is characterized in that: the feed comprises the following raw materials in parts by weight:
90 portions of grinding material
20 portions of adhesive
And 5 parts of a hydrophilic auxiliary agent.
The abrasive is alumina.
The adhesive is polyurethane adhesive.
The hydrophilic auxiliary agent is sodium dodecyl sulfate, and the HLB value is 40.
The abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 20min, heating to 80 ℃, stirring for 25min under the irradiation of ultraviolet rays with the wavelength of 360nm, adding calcium carbonate, stirring uniformly to prepare a mixture, and keeping the temperature for 70 min;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 80 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 15min after dropwise adding is finished, then cooling the reaction system to 55 ℃, and filtering, washing and drying to obtain the modified abrasive.
In the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 18:30: 10; the polyethylene glycol has a relative molecular weight of 1500.
In the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 22:3: 60.
In the step (3), the addition amount of the sodium sulfite is 10 wt% of the mixture.
The preparation method of the hydrophilic coating for the abrasive paper comprises the steps of mixing the materials in parts by weight, and uniformly dispersing the materials at the rotating speed of 1000rpm to obtain the hydrophilic coating for the abrasive paper.
The utility model provides a hydrophilic abrasive paper, includes substrate layer 1, coat in the mortar layer 2 of 1 upper surface of substrate layer and coat in the hydrophilic coating 3 of 2 upper surfaces of mortar layer, the gram weight of hydrophilic coating 3 is 80g/m2The hydrophilic coating 3 is formed by coating and curing a hydrophilic coating, and the hydrophilic coating is the sand paper hydrophilic coating.
Comparative example 1
This comparative example differs from example 5 above in that:
the hydrophilic auxiliary agent is sodium dodecyl benzene sulfonate, and the HLB value is 40.
Comparative example 2
This comparative example differs from example 3 above in that:
a hydrophilic coating for sand paper is characterized in that: the feed comprises the following raw materials in parts by weight:
Figure BDA0002315746240000121
the grinding material is a mixture of aluminum oxide and silicon carbide in a weight ratio of 1: 1.
The dispersing agent is polyethylene glycol.
Comparative example 3
This comparative example differs from example 3 above in that:
the abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding sodium carboxymethylcellulose to prepare a pre-dispersion solution;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 18min, heating to 77 ℃, stirring for 27min under the irradiation of ultraviolet rays with the wavelength of 342nm, adding calcium carbonate, stirring uniformly to prepare a mixture, and keeping the temperature for 65 min;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 77 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 17min after dropwise adding is finished, then cooling the reaction system to 48 ℃, and filtering, washing and drying to obtain the modified abrasive.
In the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the sodium carboxymethyl cellulose is 16.5: 30: 11; the polyethylene glycol has a relative molecular weight of 1500.
In the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 20:5: 60.
In the step (3), the addition amount of the sodium sulfite is 7 wt% of the mixture.
Comparative example 4
This comparative example differs from example 3 above in that:
the abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 18min, heating to 77 ℃, stirring for 27min under the irradiation of ultraviolet rays with the wavelength of 342nm, adding calcium carbonate, stirring uniformly to prepare a mixture, and keeping the temperature for 65 min;
(3) and (3) dropwise adding concentrated sulfuric acid with the mass fraction of 95 wt% into the mixture at the temperature of 77 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 17min after dropwise adding is finished, cooling the reaction system to 48 ℃, and filtering, washing and drying to obtain the modified abrasive.
In the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 16.5: 30: 11; the polyethylene glycol has a relative molecular weight of 1500.
In the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 20:5: 60.
In the step (3), the adding amount of the concentrated sulfuric acid is 7 wt% of the mixture.
Sandpaper products prepared using the coatings of examples 1 to 5 and comparative examples 1 to 4 were subjected to a sanding effect test, and further, the above-described practices were employedThe automobile painted panels were polished with the sandpaper prepared in examples and comparative examples and with sandpaper having no hydrophilic coating 3 on the general market for 30 seconds each at a polishing pressure of 8 to 15N/cm2The utility model discloses a car lacquer board, the car lacquer board is polished to the recording, and the recording is polished the polishing of the back car lacquer board that finishes at every turn and is cut last weight, and the polishing of the car lacquer board after polishing at every turn is cut last weight near, even unanimous, then explains that abrasive paper is even to the effect of polishing of work piece, prevents stifled effectual, and the difficult adhesion is polished the back and is cut the end, can guarantee the effect of polishing at every turn, and the wearability is good.
The specific test results are as follows:
number of times of polishing 1 2 3 4 5 6 7
Example 1 1.4 1.6 1.6 1.5 1.5 1.4 1.3
Example 2 1.6 1.8 1.7 1.7 1.6 1.5 1.4
Example 3 2.0 2.2 2.3 2.0 2.1 1.9 1.9
Example 4 2.1 2.1 2.0 1.9 1.9 1.8 1.8
Example 5 1.3 1.5 1.6 1.4 1.3 1.3 1.2
Ordinary sand paper 1.2 2.1 2.3 2.0 1.8 1.5 1.0
Comparative example 1 1.4 1.5 1.7 1.8 1.5 1.3 1.3
Comparative example 2 2.0 2.2 2.0 1.9 1.7 1.5 1.4
Comparative example 3 2.0 2.2 2.1 1.8 1.7 1.7 1.5
Comparative example 4 2.0 2.1 1.9 1.8 1.8 1.6 1.6
From the above data, it can be seen that the sanding weight of the automotive paint sheet of example 1 is 1.3-1.6g, the variation range is 0.3, the sanding weight of the automotive paint sheet of example 2 is 1.4-1.8g, the variation range is 0.4, the sanding weight of the automotive paint sheet of example 3 is 1.9-2.3g, the variation range is 0.4, the sanding weight of the automotive paint sheet of example 4 is 1.8-2.1g, the variation range is 0.3, the sanding weight of the automotive paint sheet of example 5 is 1.2-1.6g, the variation range is 0.4, while the ordinary sandpaper without the hydrophilic coating layer 3 is used for sanding, the sanding weight of the automotive paint sheet is 1.0-2.3g, the variation range is 1.3, the sandpaper with the variation range is 1-5, and the sanding property is four times less uneven, on one hand, the grinding materials in the hydrophilic coating can be used for removing the adhesive film in the mortar layer 2 in a grinding mode, so that the grinding effect of the abrasive paper is improved, if the hydrophilic coating is not available, the adhesive film on the surface of the mortar layer 2 and a small amount of sand materials are basically ground when the hydrophilic coating is ground at the beginning, and the workpiece is not ground enough until the adhesive film is removed in the grinding process, so that the grinding and powder cutting weight of the automobile paint plate at the initial stage is lower, the grinding and powder cutting weight of the automobile paint plate at the later stage is increased, and the workpiece is unevenly ground; on the other hand has embodied the dispersion uniformity ability of abrasive material among the hydrophilic coating 3 and has made the polishing in-process cut the powder weight comparatively balanced, the phenomenon that high-time is low when can not appear beating the powder weight of polishing, can guarantee the surface of the work piece of polishing and polish the homogeneity, its hydrophilic coating 3 can improve the wetting nature of infiltrating on abrasive paper surface simultaneously, improve the wearing and tearing to the work piece of polishing, the mar problem, ordinary abrasive paper is because there is not hydrophilic coating 3, its surface wetting nature is lower, make the later stage beat and grind powder weight reduction, mainly because surface wetting nature is lower, and cut the end jam between the abrasive paper abrasive material, and then reduce its effect of polishing.
Compared with the embodiment 5, the comparative example 1 adopts the same amount of sodium dodecyl benzene sulfonate to replace sodium dodecyl sulfate, so that the grinding weight of the automobile paint plate is 1.3-1.8, and the variation interval is 0.5, which shows that the hydrophilic coating 3 prepared by adopting other types of surfactants has lower dispersibility to the grinding materials, uneven grinding to the workpiece and reduced wear resistance and grinding uniformity of the hydrophilic coating 3.
Compared with the embodiment 3, the comparative example 2 adopts 3 parts of the dispersing agent instead of 3 parts of the same amount of the grinding material, and the grinding material is unmodified grinding material, namely the dispersing agent is directly adopted to promote the dispersibility of the grinding material, so that the grinding powder weight of the automobile paint plate is 1.4-2.2, the change interval is 0.8, the surface modification of the grinding material is not carried out, even if the dispersing agent is adopted to disperse the grinding material, the dispersibility of the grinding material is still low, the grinding of a workpiece is uneven, the powder is easy to accumulate, and the wear resistance and the grinding effect of the sand paper are reduced.
Compared with the embodiment 3, the comparative example 3 adopts the same amount of sodium carboxymethylcellulose to replace polyethylene glycol, so that the grinding weight of the automobile paint plate is 1.5-2.2, and the variation range is 0.7; the method is characterized in that other dispersing promoting agents (such as sodium carboxymethylcellulose) are adopted to disperse the abrasive in the process of modifying the abrasive, the modified abrasive has lower dispersibility than the polyethylene glycol, the dispersibility of the abrasive is still lower, the workpiece is not uniformly polished, the grinding powder is easy to accumulate, and the abrasive resistance and the polishing effect of the abrasive paper are reduced.
Compared with the comparative example 3, the comparative example 4 adopts the same amount of concentrated sulfuric acid with the concentration of 95 wt% as the sulfonating agent to carry out sulfonation reaction, so that the weight of the grinding powder of the automobile paint plate is 1.6-2.1, and the change interval is 0.5; the method is characterized in that in the process of modifying the abrasive, other sulfonating agents are adopted to sulfonate the abrasive, the modified abrasive has lower dispersibility than the sodium sulfite, the dispersibility of the abrasive is still lower, the workpiece is not uniformly polished, the grinding dust is easy to accumulate, and the abrasive resistance and polishing effect of the abrasive paper are reduced.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.

Claims (10)

1. A hydrophilic coating for sand paper is characterized in that: the feed comprises the following raw materials in parts by weight:
80-90 parts of abrasive
10-20 parts of adhesive
1-5 parts of hydrophilic auxiliary agent.
2. A hydrophilic coating for sandpaper as defined in claim 1, wherein: the abrasive is alumina and/or silicon carbide.
3. A hydrophilic coating for sandpaper as defined in claim 1, wherein: the adhesive is polyurethane adhesive and/or epoxy resin adhesive.
4. A hydrophilic coating for sandpaper as defined in claim 1, wherein: the hydrophilic auxiliary agent is at least one of a mixture of sodium dodecyl sulfate and sodium oleate, fatty alcohol-polyoxyethylene ether AEO-7, sodium oleate and sodium dodecyl sulfate; the mixing weight ratio of the sodium dodecyl sulfate to the sodium oleate in the mixture of the sodium dodecyl sulfate and the sodium oleate is 40-50: 50-60.
5. A hydrophilic coating for sandpaper as defined in claim 1, wherein: the abrasive is a modified abrasive subjected to modification treatment, and the modified abrasive is prepared by the following steps:
(1) mixing allyl alcohol polyoxyethylene ether with deionized water, uniformly dispersing, and adding polyethylene glycol to prepare a pre-dispersion liquid;
(2) adding an abrasive into the pre-dispersion liquid prepared in the step (1), stirring at room temperature for 15-20min, heating to 75-80 ℃, stirring for 25-30min under the irradiation of ultraviolet rays with the wavelength of 328-360nm, adding calcium carbonate, uniformly stirring to prepare a mixture, and preserving heat for 60-70 min;
(3) and (3) dropwise adding sodium sulfite into the mixture at the temperature of 75-80 ℃ in the step (2), stirring while dropwise adding, continuously stirring for 15-20min after dropwise adding is finished, then cooling the reaction system to 40-55 ℃, and filtering, washing and drying to obtain the modified abrasive.
6. A hydrophilic coating for sandpaper as defined in claim 5, wherein: in the step (1), the mixing weight ratio of the allyl alcohol polyoxyethylene ether, the deionized water and the polyethylene glycol is 15-18:30: 10-12; the polyethylene glycol has a relative molecular weight of 1500.
7. A hydrophilic coating for sandpaper as defined in claim 5, wherein: in the step (2), the mixing weight ratio of the grinding material, the calcium carbonate and the pre-dispersion liquid is 18-22:3-8: 60.
8. A hydrophilic coating for sandpaper as defined in claim 5, wherein: in the step (3), the addition amount of the sodium sulfite is 3-10 wt% of the mixture.
9. A method of producing a hydrophilic coating for sandpaper according to any of claims 1 to 8, characterized in that: according to the parts by weight, all the materials are mixed and uniformly dispersed under the condition that the rotating speed is 600-1000rpm, and the sandpaper hydrophilic coating is prepared.
10. A hydrophilic abrasive paper, characterized in that: comprises a substrate layer, a mortar layer coated on the upper surface of the substrate layer and a hydrophilic coating coated on the upper surface of the mortar layer, wherein the gram weight of the hydrophilic coating is 40-80g/m2The hydrophilic coating is formed by coating and curing a hydrophilic coating, and the hydrophilic coating is the hydrophilic coating for sand paper of any one of claims 1-8.
CN201911276671.XA 2019-12-03 2019-12-12 Sand paper hydrophilic coating Pending CN110885622A (en)

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