CN112692742B - Manufacturing method of flexible paper-based abrasive paper and abrasive paper - Google Patents
Manufacturing method of flexible paper-based abrasive paper and abrasive paper Download PDFInfo
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Abstract
The invention provides a method for manufacturing flexible paper-based abrasive paper, which comprises the following steps: s1, unwinding the paper-based base material; s2, coating a primer glue on the sand planting surface of the base material; s3, implanting an abrasive on the coated base glue; s4, pre-drying to form a primer layer, and humidifying after pre-drying; s5, coating compound rubber sizing materials on the outer sides of the bottom rubber layer and the abrasive material; s6, performing main drying to form a compound glue layer, and humidifying after the main drying; s7, rolling and humidifying; s8, conducting flexing and humidifying treatment to obtain sand paper; the primer layer and the compound adhesive layer are both doped with toughening agents. The invention also provides flexible paper-based abrasive paper. The flexibility of the primer layer and the compound adhesive layer is improved by adding the toughening agent into the primer adhesive material and the compound adhesive material of the abrasive paper and optimizing the formula components and the proportion of the primer adhesive material and the compound adhesive material; through four humidification processes, the water content of the paper base in the corresponding process is ensured, the brittleness of the paper base in the corresponding process is reduced, and the manufactured abrasive paper is good in flexibility, smooth and not easy to break during grinding.
Description
Technical Field
The invention relates to the technical field of grinding tools, in particular to a method for manufacturing flexible paper-based abrasive paper and the abrasive paper.
Background
Sandpaper is a grinding material made by bonding an abrasive to a paper base material through an adhesive, and can be cut into any shape according to needs and can be kneaded, so that the application is more and more extensive. The prior abrasive paper on the market has the problems of brittle paper base and easy breakage in the using process. Meanwhile, the abrasive paper is hard and has poor flatness, so that the abrasive paper has poor conformability with a plate during grinding and poor grinding surface quality. Particularly, the grinding of high-end plates cannot meet the requirement of surface smoothness, and the popularization of the abrasive paper is limited.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for manufacturing flexible paper-based abrasive paper, which comprises the steps of adding a toughening agent into a base rubber sizing material and a compound rubber sizing material of the abrasive paper, optimizing the formula components and the proportion of the base rubber sizing material and the compound rubber sizing material, and humidifying in four working procedures, so that the toughness of the paper base is improved, and the problems of easy breakage and unevenness in the grinding process of the abrasive paper are solved.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A first object of the present invention is to provide a method of manufacturing a flexible paper-based sandpaper, comprising the steps of:
s1, unwinding the paper-based base material;
s2, coating a primer glue on the sand planting surface of the base material;
s3, implanting abrasive materials on the coated base rubber material by adopting an electrostatic sand planting process, wherein the sand planting amount is 100-500 g/m2；
S4, pre-drying to form a bottom glue layer at the bottom of the fixed abrasive, and humidifying after pre-drying;
s5, coating compound rubber sizing materials on the outer sides of the bottom rubber layer and the abrasive material;
s6, performing main drying to form a compound glue layer, and humidifying after the main drying;
s7, rolling and humidifying;
s8, conducting flexing and humidifying treatment to obtain sand paper;
wherein, the primer layer and the compound adhesive layer are both doped with toughening agents.
Preferably, the primer size comprises:
preferably, the size comprises:
preferably, a diluent is also included to adjust the gum viscosity.
Preferably, in step S4, the pre-drying temperature is 80-100 ℃, and the pre-drying time is 1-2 hours; and arranging a first spraying device at the outlet of the pre-drying process to carry out humidification treatment so that the water content of the base material is 5-10%.
Preferably, the pre-drying comprises four pre-drying zones, and the first spraying device is arranged in the last drying zone.
Preferably, in step S6, the main drying temperature is 90-110 ℃, and the main drying time is 2-3 hours; and arranging a second spraying device at the outlet of the main drying process to carry out humidification treatment so that the water content of the base material is 10-15%.
Preferably, the main drying comprises eight main drying zones, and the second spraying device is arranged in the last drying zone.
Preferably, in step S7, the winding position is humidified by a compression roller, and the humidifying water contains 8-12% of ethylene glycol.
A second object of the present invention is to provide a flexible paper-based sandpaper, which is manufactured using the manufacturing method as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for manufacturing flexible paper-based abrasive paper, which is characterized in that a toughening agent is added into a base rubber sizing material and a compound rubber sizing material of the abrasive paper, and the formula components and the proportion of the base rubber sizing material and the compound rubber sizing material are optimized, so that the flexibility of the base rubber layer and the compound rubber layer is improved, the flexibility of the manufactured abrasive paper is further improved, and the probability of breaking the abrasive paper in the grinding process is reduced. In addition, the moisture content of the paper base in the corresponding process is ensured through the humidification treatment of four processes of pre-drying humidification, main drying humidification, rolling humidification and flexible humidification, the brittleness of the paper base in the corresponding process is reduced, the flexibility of the paper base during processing is improved, the processing is convenient, the probability of damage of the paper base in the manufacturing process due to the brittleness problem is reduced, and the strength of the paper base is ensured. Namely, the abrasive paper manufactured by the method has good flexibility, is not easy to break during grinding, is smooth, and improves the grinding precision.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented according to the content of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of the steps of the manufacturing method of the present invention;
FIG. 2 is a schematic structural diagram of a third spraying device used in the soft bending and humidifying process of the present invention;
FIG. 3 is a schematic structural diagram of a spray head of a third spraying device of the present invention;
FIG. 4 is a cross-sectional view of a coated abrasive according to an embodiment of the present invention.
In the figure:
100. sand paper; 11. a substrate; 12. a primer layer; 13. an abrasive; 14. compounding an adhesive layer;
200. a third spraying device; 21. a spray head; 211. a first inlet; 212. a second inlet; 22. a compressed air passage; 23. a spray switch; 24. a waterway.
Detailed Description
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, which will enable those skilled in the art to practice the present invention with reference to the accompanying specification. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The invention provides a method for manufacturing flexible paper-based sand paper, which comprises the following steps as shown in figure 1:
s1, unwinding the paper-based base material; specifically, the method is carried out on a semi-automatic uncoiling printer, the uncoiling speed is 15-25 m/min, and further trademarks are printed according to user requirements during uncoiling;
s2, coating a primer glue on the sand planting surface of the base material; specifically, the primer sizing is coated on an automatic primer machine; in addition, before coating the sizing material, preparing a base sizing material and a compound sizing material for standby;
s3, implanting abrasive materials on the coated base rubber material by adopting an electrostatic sand planting process, wherein the sand planting amount is 100-500 g/m2(ii) a Specifically, the method is carried out on an automatic electrostatic sand planting machine, the speed of each process is synchronous and consistent, abrasive particles are changed into charged bodies for jumping through electrode discharge in a high-voltage electrostatic field and are uniformly and vertically distributed on a paper base, and the sand planting amount is determined according to the particle size of the abrasive particles;
s4, pre-drying, wherein the pre-drying is carried out in a suspension type pre-drying chamber, the speed of each procedure is synchronous and consistent, and the pre-drying is carried out to dry and solidify the base glue sizing material so as to form a base glue layer at the bottom of the fixed abrasive; humidifying after pre-drying so that the base material keeps a certain water content after pre-drying, the brittleness of the base material after drying and curing is reduced, and the surface smoothness and flexibility of the base material are improved so as to facilitate subsequent coating of compound glue;
s5, coating compound rubber sizing materials on the outer sides of the bottom rubber layer and the abrasive material; specifically, coating the compound rubber material on an automatic compound rubber machine;
s6, drying the main rubber material in a suspended main drying chamber, wherein the speeds of all the working procedures are synchronous and consistent, so that the compound rubber material is dried and solidified to form a compound rubber layer; humidifying after main drying so that the base material after main drying keeps certain water content, the brittleness of the base material after drying and curing is reduced, the surface smoothness and flexibility of the base material are improved, subsequent rolling is facilitated, and the influence of subsequent rolling operation on the strength of the paper base is reduced;
s7, rolling and humidifying; specifically, the method is carried out in a heat insulation chamber communicated with a main drying chamber, the speed of each process is synchronous and consistent, and a compression roller is added at a rolling position for humidification, so that the rolled base material has certain water content, and the water loss of the base material is avoided; after rolling and humidifying, standing for one to two days;
s8, conducting flexing and humidifying treatment to obtain sand paper; specifically, a sand paper flexing process is adopted, and continuous and fine cracks are generated on a glue layer of the base material through flexing operation, so that the base material obtains flexibility; in the process of softening, the substrate is heated, and a wetting agent is uniformly sprayed on the back surface of the substrate, wherein the wetting agent is water generally, so that the brittleness of the substrate is reduced, and the softening operation is facilitated; after the flexible bending and humidifying treatment, the coil is placed into a large coil warehouse after being wound;
wherein, the primer layer and the compound adhesive layer are both doped with toughening agents. The flexibilizers are doped in the bottom glue layer and the compound glue layer, namely the bottom glue material and the compound glue material contain a certain amount of flexibilizers, so that the flexibility of the bottom glue layer and the compound glue layer is improved, the flexibility of the manufactured abrasive paper is further improved, and the probability of breakage of the abrasive paper in the grinding process is reduced. In addition, the flexibility of the bottom glue layer and the compound glue layer is improved, and the probability of peeling the glue layer from the base material or the abrasive material due to the fact that the bottom glue layer and the compound glue layer bear larger pressure in the grinding process of the abrasive paper is reduced.
In one embodiment, the paper-based substrate has a weight of 240 to 260g/m2The thickness of the steel plate is 0.25-0.3 mm, the warp tensile strength is 1400-1500N/5 cm, the weft tensile strength is 400-500N/5 cm, the warp elongation at break is 4-6%, the weft elongation at break is 8-12%, and the water content is 5-8%.
In one embodiment, the abrasive material comprises corundum or silicon carbide, and the amount of the implanted sand is 60-250 g/m2The granularity is P60-P500.
In one embodiment, the coating amount of the primer rubber is 30-70 g/m2The coating amount of the compound rubber is 50-180 g/m2. Specifically, when the grain size of the abrasive is increased, the coating amount and the sand planting amount of the base rubber sizing material and the compound rubber sizing material are correspondingly increased, so that the abrasive is firmly bonded, and the use cost of the sizing material is reduced.
In one embodiment, the primer size comprises:
specifically, epoxy resin is used as an adhesive for sandpaper, and a layer of adhesive formed of epoxy resin has a certain flexibility. The silica is used as a filler, so that the processing performance of the primer rubber material is improved, and the cost is reduced. The fluorinated phosphazene rubber is taken as a toughening agent, is an amorphous linear fluoroalkoxyphosphazene high-molecular elastomer taking phosphorus and nitrogen atoms as main chains, has good physical and mechanical strength and good flexibility, and is used for increasing the flexibility of a primer layer. The polydimethylsiloxane is used as a dispersing agent, so that the solid matters in the primer sizing material are uniformly dispersed in the liquid matters without agglomeration. The coupling agent enables the inorganic filler to be tightly combined with the epoxy resin, and enables the subsequently implanted abrasive to be tightly combined with the resin in the bottom adhesive layer; further, the coupling agent is a silane coupling agent. The sodium dialkyl sulfosuccinate is used as a defoaming agent and is used for eliminating foam impurities generated in the stirring process of the base rubber material so as to prevent the foam from influencing the bonding strength and the adhesive force of the base rubber material and enable the base rubber material to better bond a base material and an abrasive material. The curing agent is used for carrying out chemical reaction with the epoxy resin to form a net-shaped three-dimensional polymer, and in addition, the toughening agent envelops the net-shaped body formed by the reaction of the curing agent and the epoxy resin to form a three-dimensional toughening structure so as to improve the toughening property.
Further, the primer sizing material also comprises a diluent for adjusting the viscosity of the primer sizing material so as to adjust the viscosity to be suitable for coating the primer sizing material and bonding the abrasive.
In one embodiment, the size comprises:
specifically, the phenolic resin is used as the adhesive of the compound adhesive layer, has good heat resistance and mechanical strength, when the abrasive paper is ground, the surface of the abrasive paper and the surface of a tool are quickly rubbed to generate instantaneous high temperature, and the high temperature resistance of the phenolic resin is used for reducing the oxidation of the compound adhesive layer at the instantaneous high temperature and prolonging the service life of the compound adhesive layer. Wollastonite is used as a filler, so that the processing performance of the primer rubber is improved, and the cost is reduced. The fluorinated phosphazene rubber is taken as a toughening agent, is an amorphous linear fluoroalkoxyphosphazene high-molecular elastomer taking phosphorus and nitrogen atoms as main chains, has good physical and mechanical strength and good flexibility, and is used for increasing the flexibility of a compound rubber layer. The polydimethylsiloxane is used as a dispersing agent, so that solid matters in the compound rubber material are uniformly dispersed in liquid matters without agglomeration. The coupling agent enables the inorganic filler to be tightly combined with the phenolic resin; further, the coupling agent is a silane coupling agent. The sodium dialkyl sulfosuccinate is used as a defoaming agent and is used for eliminating foam impurities generated in the stirring process of the compound rubber material so as to avoid the influence of foam on the bonding strength and the adhesive force of the compound rubber material and enable the compound rubber material to be better bonded to the outer sides of the base material and the grinding material.
Further, the compound rubber compound also comprises a diluent for adjusting the viscosity of the compound rubber compound so as to adjust the viscosity required by the coating of the compound rubber compound and the bonding of the abrasive and the primer layer.
In one embodiment, in step S4, the pre-drying temperature is 80-100 ℃, and the pre-drying time is 1-2 hours; and arranging a first spraying device at the outlet of the pre-drying process to carry out humidification treatment so that the water content of the base material is 5-10%. The predrying includes four predrying areas, first spray set sets up in last drying area. Specifically, the predrying is carried out in suspension type predrying room, and the predrying room is divided into four predrying districts, and last drying district temperature is the highest, adopts the temperature to increase progressively dry mode to make the substrate temperature rise gradually in order to realize the drying, in order to avoid the temperature to rise too fast and make primer layer or substrate take place to warp.
In one embodiment, in step S6, the main drying temperature is 90 to 110 ℃, and the main drying time is 2 to 3 hours; and arranging a second spraying device at the outlet of the main drying process to carry out humidification treatment so that the water content of the base material is 10-15%. The main drying comprises eight main drying areas, and the second spraying device is arranged in the last drying area. Specifically, main drying is carried out in a suspended main drying chamber, the main drying chamber is divided into eight main drying areas, the temperature of the last main drying area is highest, and a temperature increasing drying mode is adopted as with pre-drying, so that the temperature of the compound glue material is gradually increased to realize solidification, and deformation of a compound glue layer caused by sudden temperature rise is avoided.
In one embodiment, in step S7, the rolling part is humidified by a pressing roller, the humidifying water contains 8-12% of glycol, and the glycol is added to enhance the combination of moisture and the sandpaper, so as to improve the humidifying efficiency, so that the moisture content of the rolled sandpaper roll is 10-15%, and the water retention of the sandpaper roll in the flexing process is improved.
In one embodiment, the water content of the sandpaper after the softening and humidifying treatment is 10-20%. The obtained sand paper can be used after being cured. Further, the third spray device 200 for soft humidification is used for humidification, as shown in fig. 2, the third spray device 200 comprises:
a plurality of spray heads 21 for spraying;
a compressed air passage 22 for inputting compressed air to apply pressure to the water flow, and pressurizing the water flow to make the water flow be sprayed out from the spray head 21 as water vapor;
a spray switch 23 for controlling the opening or closing of the corresponding spray head 21;
a water path 24 for conveying water.
Further, as shown in fig. 3, a first inlet 211 for inputting water flow is provided at one side of the spray head 21; the other side is provided with a second inlet 212 for inputting compressed air to pressurize the spray head 21. The mist water sprayed by the spray head 21 can be adjusted according to requirements so as to uniformly humidify the base material.
The invention also provides flexible paper-based abrasive paper which is prepared by adopting the manufacturing method. Specifically, as shown in fig. 4, the sandpaper 100 sequentially includes a substrate 11, a make coat 12, an abrasive 13, and a size coat 14, wherein the make coat 12 is adhered to one surface of the substrate 11, the bottom of the abrasive 13 is partially embedded in the make coat 12, and the size coat 14 is adhered to the outer surfaces of the make coat 12 and the abrasive 13; the base glue layer 12 and the compound glue layer 14 comprise toughening agents, so that the flexibility of the base glue layer 12 and the compound glue layer 14 is improved, and the flexibility of the abrasive paper is further improved.
In order to illustrate the invention herein, specific examples are set forth below. It should be understood that these examples are for illustrative purposes only and are not to be construed as limiting the invention in any way.
Example 1
A method of manufacturing flexible paper-based sandpaper, comprising the steps of:
(1) uncoiling the paper-based substrate; the weight of the paper-based substrate is 250g/m2The thickness is 0.25mm, the warp direction tensile strength is 1400N/5cm,the latitudinal tensile strength is 400N/5cm, the elongation at break in the warp direction is 5%, the elongation at break in the latitudinal direction is 10%, and the water content is 5%;
(2) coating a base rubber material on the sand planting surface of the base material by adopting an automatic base rubber machine, wherein the coating amount of the base rubber material is 70g/m2；
(3) Corundum with the grain diameter of P120 and serving as abrasive is implanted into the rubber material coated with the primer by adopting an electrostatic sand implantation process, wherein the sand implantation amount is 130g/m2；
(4) Pre-drying, namely performing pre-drying in a suspension type pre-drying chamber, wherein the pre-drying chamber is divided into four regions, the temperatures are respectively 80 ℃, 90 ℃ and 90 ℃, so that a primer glue material is solidified to form a primer layer at the bottom of a solidified abrasive, and the fourth pre-drying region is provided with a humidifying spraying device so that the water content of a pre-dried base material is 7%;
(5) coating compound rubber materials on the outer sides of the bottom rubber layer and the abrasive material by adopting an automatic compound rubber machine, wherein the coating amount of the compound rubber materials is 120g/m2；
(6) Performing main drying in a suspended main drying chamber, wherein the main drying chamber is divided into eight regions at the temperature of 90 ℃, 100 ℃, 105 ℃ and 110 ℃ respectively, so that the compound adhesive is cured to form a compound adhesive layer; humidifying after main drying so as to ensure that the water content of the base material after main drying is 12%;
(7) rolling and humidifying to ensure that the water content of the rolled base material is 12%;
(8) the sandpaper was softened and moisturized to make the water content of the sandpaper 13%. Curing for 48h to obtain the sandpaper product.
Wherein the primer sizing comprises:
the compound rubber material comprises:
example 2
A method of manufacturing flexible paper-based sandpaper, comprising the steps of:
(1) uncoiling the paper-based substrate; the weight of the paper-based substrate is 250g/m2The thickness is 0.25mm, the warp tensile strength is 1400N/5cm, the weft tensile strength is 400N/5cm, the warp elongation at break is 5%, the weft elongation at break is 10%, and the water content is 5%;
(2) coating a base rubber material on the sand planting surface of the base material by adopting an automatic base rubber machine, wherein the coating amount of the base rubber material is 70g/m2；
(3) Corundum with the grain diameter of P120 and serving as abrasive is implanted into the rubber material coated with the primer by adopting an electrostatic sand implantation process, wherein the sand implantation amount is 130g/m2；
(4) Pre-drying, namely performing pre-drying in a suspension type pre-drying chamber, wherein the pre-drying chamber is divided into four regions, the temperatures are respectively 80 ℃, 90 ℃ and 90 ℃, so that a primer glue material is solidified to form a primer layer at the bottom of a solidified abrasive, and the fourth pre-drying region is provided with a humidifying spraying device so that the water content of a pre-dried base material is 5%;
(5) coating compound rubber materials on the outer sides of the bottom rubber layer and the abrasive material by adopting an automatic compound rubber machine, wherein the coating amount of the compound rubber materials is 120g/m2；
(6) Performing main drying in a suspended main drying chamber, wherein the main drying chamber is divided into eight regions at the temperature of 90 ℃, 100 ℃, 105 ℃ and 110 ℃ respectively, so that the compound adhesive is cured to form a compound adhesive layer; humidifying after main drying so as to enable the water content of the base material after main drying to be 10%;
(7) rolling and humidifying to ensure that the water content of the rolled base material is 10 percent;
(8) softening and humidifying to make the water content of the sand paper be 10%. Curing for 48h to obtain the sandpaper product.
Wherein the primer sizing comprises:
the compound rubber material comprises:
example 3
A method of manufacturing flexible paper-based sandpaper, comprising the steps of:
(1) uncoiling the paper-based substrate; the weight of the paper-based substrate is 250g/m2The thickness is 0.25mm, the warp tensile strength is 1400N/5cm, the weft tensile strength is 400N/5cm, the warp elongation at break is 5%, the weft elongation at break is 10%, and the water content is 5%;
(2) coating a base rubber material on the sand planting surface of the base material by adopting an automatic base rubber machine, wherein the coating amount of the base rubber material is 70g/m2；
(3) Corundum with the grain diameter of P120 and serving as abrasive is implanted into the rubber material coated with the primer by adopting an electrostatic sand implantation process, wherein the sand implantation amount is 130g/m2；
(4) Pre-drying, namely performing pre-drying in a suspension type pre-drying chamber, wherein the pre-drying chamber is divided into four regions, the temperatures are respectively 80 ℃, 90 ℃ and 90 ℃, so that a primer glue material is solidified to form a primer layer at the bottom of a solidified abrasive, and the fourth pre-drying region is provided with a humidifying spraying device so that the water content of a pre-dried base material is 10%;
(5) coating compound rubber materials on the outer sides of the bottom rubber layer and the abrasive material by using an automatic compound rubber machine, wherein the coating amount of the compound rubber materials is 120 g/m;
(6) performing main drying in a suspended main drying chamber, wherein the main drying chamber is divided into eight regions at the temperature of 90 ℃, 100 ℃, 105 ℃ and 110 ℃ respectively, so that the compound adhesive is cured to form a compound adhesive layer; humidifying after main drying so as to enable the water content of the base material after main drying to be 15%;
(7) rolling and humidifying to ensure that the water content of the rolled base material is 15%;
(8) softening and humidifying the sand paper to ensure that the water content of the sand paper is 20 percent. Curing for 48h to obtain the sandpaper product.
The raw materials and the use amount of the base rubber and the compound rubber are the same as those of the base rubber and the compound rubber in example 1.
Example 4
The manufacturing process of the embodiment is the same as that of the embodiment 1, and the base rubber sizing material and the compound rubber sizing material are different from those of the embodiment 1.
Wherein the primer sizing comprises:
the compound rubber material comprises:
example 5
A method of manufacturing flexible paper-based sandpaper, comprising the steps of:
(1) uncoiling the paper-based substrate; the weight of the paper-based substrate is 250g/m2The thickness is 0.25mm, the warp tensile strength is 1400N/5cm, the weft tensile strength is 400N/5cm, the warp elongation at break is 5%, the weft elongation at break is 10%, and the water content is 5%;
(2) coating a base rubber material on the sand planting surface of the base material by adopting an automatic base rubber machine, wherein the coating amount of the base rubber material is 70g/m2；
(3) Corundum with the grain diameter of P120 and serving as abrasive is implanted into the rubber material coated with the primer by adopting an electrostatic sand implantation process, wherein the sand implantation amount is 130g/m2；
(4) Pre-drying, namely performing pre-drying in a suspension type pre-drying chamber, wherein the pre-drying chamber is divided into four regions, the temperatures are respectively 80 ℃, 90 ℃ and 90 ℃, so that a primer glue material is solidified to form a primer layer at the bottom of a solidified abrasive, and the fourth pre-drying region is provided with a humidifying spraying device so that the water content of a pre-dried base material is 10%;
(5) coating compound rubber materials on the outer sides of the bottom rubber layer and the abrasive material by using an automatic compound rubber machine, wherein the coating amount of the compound rubber materials is 120 g/m;
(6) performing main drying in a suspended main drying chamber, wherein the main drying chamber is divided into eight regions at the temperature of 90 ℃, 100 ℃, 105 ℃ and 110 ℃ respectively, so that the compound adhesive is cured to form a compound adhesive layer; humidifying after main drying so as to enable the water content of the base material after main drying to be 15%;
(7) rolling and humidifying to ensure that the water content of the rolled base material is 15%;
(8) softening and humidifying the sand paper to ensure that the water content of the sand paper is 20 percent. Curing for 48h to obtain the sandpaper product.
Wherein the primer sizing comprises:
the compound rubber material comprises:
comparative example 1
The primer rubber material and the compound rubber material of the embodiment do not contain the fluorinated phosphazene rubber, and other processes are the same as those of the embodiment 1.
Comparative example 2
The present example has no pre-drying humidification, main drying humidification, winding humidification treatment, and other processes and base glue sizing materials and compound glue sizing materials are the same as the example 1.
Comparative example 3
The primer rubber material and the compound rubber material do not contain phosphonitrile fluoride rubber, and the processes of pre-drying humidification, main drying humidification and rolling humidification are not needed, and the other processes are the same as those in the example 1.
Example 6
The bending stiffness of the sandpaper manufactured in examples 1 to 6 and comparative examples 1 to 3 was measured by a textile stiffness tester, and the measured structure is shown in table one.
Watch 1
As can be seen from the table one, the bending stiffness of examples 1 to 5 is not more than 100Mg × cm, and the flexibility is improved by about 50% compared to comparative examples 1 to 3. The flexibility of the primer layer and the flexibility of the compound adhesive layer are improved by adding the toughening agent into the primer adhesive material and the compound adhesive material of the abrasive paper, the water content of the paper base in the corresponding procedure is ensured by adding pre-drying humidification, main drying humidification and rolling humidification in the manufacturing process, the brittleness of the paper base in the corresponding procedure is reduced, the flexibility of the paper base during processing is improved, and the processing is facilitated. The paper base has poor deformability due to brittleness, and the paper base has certain flexibility due to proper water content, so that the paper base is not easy to damage in the manufacturing process to reduce the strength.
The invention provides a method for manufacturing flexible paper-based abrasive paper, which is characterized in that a toughening agent is added into a base rubber sizing material and a compound rubber sizing material of the abrasive paper, the formula components and the proportion of the base rubber sizing material and the compound rubber sizing material are optimized, four procedures are performed with humidification treatment, the toughness of the paper base is improved, the impact resistance of the paper base is improved, the brittleness is reduced, and the risk of abrasive paper breakage in the using process is reduced. In addition, after the paper base is toughened, the smoothness is improved, the paper base can be used for manufacturing ultrafine-grained abrasive paper, the rejection rate caused by appearance defects of the abrasive paper is reduced, the manufacturing cost is reduced, the product quality of the abrasive paper is improved, the conformability between the abrasive paper and a plate in the grinding process is increased, and the processing precision and the surface grinding smoothness of the plate are improved.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. A method of making a flexible paper-based sandpaper, comprising the steps of:
s1, unwinding the paper-based base material;
s2, coating a primer glue on the sand planting surface of the base material;
s3, implanting abrasive materials on the coated base rubber material by adopting an electrostatic sand planting process, wherein the sand planting amount is 100-500 g/m2；
S4, pre-drying to form a bottom glue layer at the bottom of the fixed abrasive, and humidifying after pre-drying;
s5, coating compound rubber sizing materials on the outer sides of the bottom rubber layer and the abrasive material;
s6, performing main drying to form a compound glue layer, and humidifying after the main drying;
s7, rolling and humidifying;
s8, conducting flexing and humidifying treatment to obtain sand paper;
wherein, the primer layer and the compound adhesive layer are both doped with a toughening agent;
the base glue sizing material comprises:
2. a method of making a flexible paper-based sandpaper as defined in claim 1, wherein the size compound comprises:
3. a method of making a flexible paper-based sandpaper as claimed in claim 1 or 2, further comprising a diluent to adjust the viscosity of the size.
4. The method for manufacturing a flexible paper-based sandpaper as claimed in claim 1, wherein in step S4, the pre-drying temperature is 80-100 ℃ and the pre-drying time is 1-2 hours; and arranging a first spraying device at the outlet of the pre-drying process to carry out humidification treatment so that the water content of the base material is 5-10%.
5. A method of manufacturing a flexible paper-based sandpaper as defined in claim 4, wherein said predrying comprises four predrying zones, said first spraying means being disposed in a last drying zone.
6. The method for manufacturing a flexible paper-based sandpaper as claimed in claim 1, wherein in step S6, the main drying temperature is 90 to 110 ℃ and the main drying time is 2 to 3 hours; and arranging a second spraying device at the outlet of the main drying process to carry out humidification treatment so that the water content of the base material is 10-15%.
7. A method of manufacturing a flexible paper-based sandpaper as defined in claim 6, wherein the primary drying comprises eight primary drying zones, the second spraying means being disposed in a last drying zone.
8. The method for manufacturing a flexible paper-based sandpaper as claimed in claim 1, wherein in step S7, the rolling position is humidified by a compression roller, and the humidifying water contains 8-12% of glycol.
9. A flexible paper-based sandpaper characterized by being produced by the production method according to any one of claims 1 to 8.
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| CN114012614B (en) * | 2021-12-07 | 2023-06-23 | 开封格锐特研磨科技有限公司 | Coated abrasive tool abrasive cloth sand paper manufacturing system |
| CN115179206A (en) * | 2022-07-04 | 2022-10-14 | 杭州永杰研磨材料股份有限公司 | Oil-proof wear-resistant abrasive paper and processing device thereof |
| CN115431187A (en) * | 2022-09-14 | 2022-12-06 | 白鸽磨料磨具有限公司 | Manufacturing method of abrasive cloth with high-flatness sand surface accumulated abrasive |
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