CN121156830A - Surface polishing process for cork furniture - Google Patents
Surface polishing process for cork furnitureInfo
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- CN121156830A CN121156830A CN202511689211.5A CN202511689211A CN121156830A CN 121156830 A CN121156830 A CN 121156830A CN 202511689211 A CN202511689211 A CN 202511689211A CN 121156830 A CN121156830 A CN 121156830A
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- polishing
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- cork
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- primer
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Abstract
The invention relates to a cork furniture surface polishing process, and belongs to the field of furniture polishing. The invention acidizes the surface of the rough polished furniture by adopting super acidic diluent, then coats water-based primer, adopts dry ice sand blasting treatment when the water-based primer reaches semi-solidification, and finally coats water-based finish paint, carries out graded polishing, is clean, has no polishing agent for polishing, and has polishing agent for polishing. The polishing method is particularly suitable for polishing cork furniture, and even if the primer and the finish paint are both water-based paint, the surface of the furniture plate has visible holes, and the polishing process can also polish to form a complete mirror effect without using hole sealing agents. In the process of coating water paint, bubbles are not easy to form, the phenomenon of rib rising does not occur, and a large number of burrs do not occur even if the water paint is polished to 400 meshes before the water paint is coated, so that the subsequent polishing difficulty can be remarkably reduced.
Description
Technical Field
The invention relates to the technical field of furniture polishing, in particular to a cork furniture surface polishing process.
Background
In the field of furniture polishing, a general polishing process comprises the following process flows:
1. Substrate preparation
The plates are subjected to pretreatment such as blanking, edge sealing, slot pulling, compounding and the like, so that the size and the shape of the plates meet the design requirements.
2. The surface is coarsely ground (for example, 120 meshes) to remove wood dust and impurities, and then finely ground with fine sand paper (for example, 180 meshes, 400 meshes and the like) to make the surface smooth and scratch-free.
3. Primer coating
The aqueous primer is used and a spray or roll coating device is used for uniform coating. The primer has the main functions of improving the adhesion of the top coat and sealing the wood pores.
The primer drying time is about 8 minutes, and the surface flatness after drying is basically unchanged.
4. Finish paint coating
The uniform coating is usually carried out by a dry-type reciprocating paint sprayer or a twin-roll coater. The drying time of the finish paint is about 6.5-7 minutes.
5. Drying/curing
And according to the properties of the paint, drying is carried out if the paint needs to be dried.
For water-based paint, natural drying (5-7 hours) or low-temperature drying is often adopted to ensure uniform hardening of the paint film.
6. Polishing
The mechanical polishing equipment (abrasive materials and grinding tools) is adopted to carry out the multi-stage treatment of rough grinding and fine grinding. The surface defects are removed by using coarser particles (for example, 240-400 meshes of sand paper is adopted firstly), then 600-1000 meshes of sand paper is used for polishing, and finally fine polishing is carried out by using fine particles (for example, more than 1500 meshes), so that the surface glossiness is improved and the required smoothness is achieved.
And finally polishing, namely polishing is generally carried out without adopting a polishing agent, and then polishing is carried out by coating the polishing agent. Finally, removing residual dust by using soft cloth or a clean brush to ensure the surface of the paint film to be clean.
For furniture polishing, spraying primer and finish paint generally adopts spraying and brushing.
The spraying is by airless spray gun, through the direct blowout of pressure, the emulsion paint that spouts from the spray gun bore is vaporific, can be evenly by wall body adhesion and absorption. The advantage is that no brush mark is generated, which is not done by painting. The efficiency is 10-16 times of that of the coating. The disadvantages are that these samples are difficult to paint at corners and gaps, and that the color difference to be repaired is more pronounced than with paint, if knocked over, with a very Fei Qi.
The brush coating needs to be manually operated step by step, and has low efficiency and large labor force. Brush marks are easily left, and uneven film thickness and the like are easily caused, so that the subsequent polishing and polishing are difficult. The paint has the advantages that paint can be saved compared with a spraying brush, the painted surface has texture after brushing, and the paint is more suitable for middle-high-end furniture.
For hard wood, no matter whether paint is water paint or not, no matter whether spraying and brushing are adopted, no matter whether visible holes exist on the surface of furniture material (round small holes with the diameter of about 1-2mm are usually formed on the surface of wood, most of the holes are left by insect activities, and some cork is large in texture gaps due to weather and the like, small holes with the diameter of about 1-2mm are easy to occur, and the small holes are visible to naked eyes and are commonly called visible holes), when the paint is sprayed and painted with primer, hole sealing is easy to carry out on the surface of furniture material, and the hole sealing effect is good, and the combination between the primer and the furniture material is good.
However, in the case of cork, if only brushing is used, both the primer and the top-coat are water-based paints, such as water-based acrylic primer and top-coat, and if the surface of the furniture material is sealed without using an additional sealing agent, it is difficult to polish the surface to form a complete mirror effect. Before priming, a hole sealing agent (such as epoxy resin glue) is generally used for priming. If no hole is sealed, on one hand, bubbles are formed when the water paint is brushed at the visible holes, the bubbles can be eliminated generally only through vacuumizing treatment, and the vacuumizing operation cost is very expensive, on the other hand, after the wood absorbs water, large-area deformation can occur near the visible holes, the phenomenon of rib rising easily occurs when the wood is serious, the thickness of the primer is required to be obviously increased, otherwise, an ideal polishing effect cannot be formed, the thickness of the primer is too thick, and when the epoxy resin glue is used for hole sealing, other micropores of the wood are blocked, so that the bonding effect between the primer and the wood can be reduced. Finally, some cork is ground to 400 meshes, when the water-based primer is brushed, a large amount of burrs are generated near the hole sealing area of the visible hole, probably because the cured epoxy resin is different from wood in texture and hardness, and a large amount of tiny scattered fibers are easily generated at the junction of the cured epoxy resin and the wood when the water-based primer is brushed, and the burrs are formed, in this case, the cork is ground to 240 meshes, but the adhesion between the subsequent primer and the wood is affected, if the cork is ground to 400 meshes, the burrs are removed through continuous grinding and finishing, then the water-based primer is coated again and the cork is ground again, and the repeated operation is repeated for 8-12 times at least, so that the burrs are possibly eliminated, the time and the labor are consumed, the consumable is consumed, and the polishing difficulty is very high.
Based on this, the present invention has been proposed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a cork furniture surface polishing process, which adopts the following technical scheme:
A cork furniture surface finish process comprising the steps of:
step 1, polishing the surface of cork furniture to be treated to obtain rough polished furniture;
Brushing the surface of the rough polished furniture by using super acidic diluent, and obtaining pretreated furniture after the rough polished furniture is dried;
step 3, coating the pretreated furniture surface with a water-based primer once, adopting dry ice sand blasting treatment when the water-based primer reaches half-curing, and standing until the water-based primer is completely cured;
and 4, repeating the process in the step 3 for 0-2 times to obtain the primer-attached furniture, wherein the repetition times can be adjusted according to the thickness of the paint film required by the process.
Step 5, polishing the primer-attached furniture, then coating water-based finish paint, and standing until the water-based finish paint is completely solidified to obtain the finish paint-attached furniture;
And step 6, grading polishing is carried out on the surface paint attached furniture by adopting mechanical polishing equipment, cleaning is carried out, polishing is carried out without polishing agent, and polishing is carried out with polishing agent.
As a further scheme of the invention, the super acidic diluent is 0.000076% by mass of aqueous solution of trifluoromethanesulfonic acid.
As a further scheme of the invention, a dry ice blasting machine is used for carrying out dry ice blasting treatment and blasting, the compressed air pressure during dry ice blasting is 0.35-0.38MPa, the diameter of dry ice particles is 1.5-3mm, and the flow rate of dry ice is 20-26kg/h.
As a further aspect of the invention, in step 2, the rough-polished furniture drying temperature is no more than 22 ℃.
In the step 1, the surface of the cork furniture to be treated is polished by using 120-180-mesh sand paper, and then the surface of the cork furniture is polished by using 240-400-mesh sand paper to obtain coarse polished furniture, wherein 120, 180, 240, 400-mesh sand paper can be selected according to the requirement.
As a further scheme of the invention, in the step 5, the primer-attached furniture is polished, the surface of the primer-attached furniture is polished by using 180-mesh sand paper, and then the surface of the primer-attached furniture is polished by using 400-mesh sand paper.
As a further scheme of the invention, the wood of the cork furniture to be treated is one or more of pine, fir, cypress, poplar, birch and rubber wood.
As a further scheme of the invention, in the step 6, the grading polishing is that 600-mesh sand paper is used for polishing, 800-1000-mesh sand paper is used for polishing, and 1500-2000-mesh sand paper is used for polishing.
As a further aspect of the present invention, in step 6, polishing without a polishing agent means polishing without using a polishing agent.
As a further aspect of the present invention, in step 6, polishing with a polishing agent means polishing with a polishing agent.
Compared with the prior art, the invention has the beneficial effects that:
1. The polishing method is particularly suitable for polishing cork furniture, and even if the primer and the finish paint are both water-based paint, the surface of the furniture plate has visible holes, and the polishing process can also polish to form a complete mirror effect without using hole sealing agent. In the process of coating water paint, bubbles are not easy to form, the phenomenon of rib rising does not occur, and a large number of burrs do not occur even if the water paint is polished to 400 meshes before the water paint is coated, so that the subsequent polishing difficulty can be remarkably reduced.
2) And the dry ice blasting treatment is carried out when the acidification of the super acidic diluent and the water-based primer reach semi-solidification, and the two are indispensable, otherwise, the complete mirror effect cannot be formed.
3) Cork furniture which is acidified by adopting super acidic diluent has good anti-worm-eaten effect.
Detailed Description
The present invention will now be described in detail with reference to the following specific examples, which are intended to be illustrative of only some, but not all embodiments of the invention. All other embodiments, based on the examples of the invention, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the invention.
Example 1
And step 1, polishing the surface of the cork furniture to be treated by using 180-mesh sand paper, and polishing by using 400-mesh sand paper to obtain coarse polished furniture.
And 2, brushing the surface of the rough polished furniture by adopting super acidic diluent which is 0.000076% of trifluoro methanesulfonic acid aqueous solution by mass. And drying the rough polished furniture in the shade at a drying temperature not exceeding 22 ℃, and obtaining the pretreated furniture after the rough polished furniture is dried. The dry detection criteria herein may be implemented with a simple detection method such as "touch dry".
And 3, coating the pretreated furniture surface with the water-based primer for one time, and carrying out dry ice blasting treatment for 1 time by using a dry ice blasting machine when the water-based primer is semi-cured, wherein the compressed air pressure during dry ice blasting is 0.35MPa, the diameter of dry ice particles is 1.5-3mm, and the dry ice flow is 20-26kg/h. Standing until the water-based primer is completely solidified, and obtaining the primer-attached furniture. By fully cured is meant that the aqueous paint is fully dry, which can be detected by "touch-dry".
By "semi-cure" is meant that the aqueous lacquer has lost most of the solvent during drying, the film begins to form, but the crosslinking or film forming reaction has not yet been completed. At this time, the paint layer has certain strength, but can be completely solidified by subsequent heating, drying or natural aging to form an abrasion-resistant and chemical corrosion-resistant complete film layer.
The method for detecting semi-curing comprises the steps of coating a layer of water-based primer on a sample plate synchronously under the same environment, and applying a 3.2 multiplied by 2.2 multiplied by 0.6cm rubber (17 g in mass) to the sample plate after the water-based primer is cured for 2min, wherein the rubber is adhered by the viscosity of the paint layer, and the rubber with the special size and gram weight is subjected to the characteristic size along with the deepening of the curing degree, so that the water-based primer is naturally peeled off from the sample plate once the water-based primer is subjected to the semi-curing degree.
And 4, polishing the primer-attached furniture, namely polishing the surface of the primer-attached furniture by using 180-mesh sand paper, and polishing by using 400-mesh sand paper. And then, coating the water-based finish paint, and standing until the water-based finish paint is completely solidified, thus obtaining the finish paint attached furniture.
Step 5, grading polishing is carried out on the surface paint attached furniture by adopting mechanical polishing equipment, wherein the grading polishing is that 600-mesh sand paper is used for polishing, 800-mesh sand paper is used for polishing, and 1500-mesh sand paper is used for polishing. And (3) cleaning, namely polishing without a polishing agent, polishing with the polishing agent, and finishing polishing to form a complete mirror effect on the surface of the cork furniture.
In this example, the hole sealing agent is not used in the polishing process, and the complete mirror effect can be formed by polishing. In the process of coating water paint, bubbles are not easy to form, the phenomenon of rib rising can not occur, and a large number of burrs can not occur even if the water paint is polished to 400 meshes before the water paint is coated.
Example 2
And step 1, polishing the surface of the cork furniture to be treated by using 180-mesh sand paper, and polishing by using 400-mesh sand paper to obtain coarse polished furniture.
And 2, brushing the surface of the rough polished furniture by adopting super acidic diluent which is 0.000076% of trifluoro methanesulfonic acid aqueous solution by mass. And drying the rough polished furniture in the shade at a drying temperature not exceeding 22 ℃, and obtaining the pretreated furniture after the rough polished furniture is dried. The dry detection criteria herein may be implemented with a simple detection method such as "touch dry".
And 3, coating the pretreated furniture surface with the water-based primer for one time, and carrying out dry ice blasting treatment for 1 time by using a dry ice blasting machine when the water-based primer is semi-cured, wherein the compressed air pressure during dry ice blasting is 0.38MPa, the diameter of dry ice particles is 1.5-3mm, and the dry ice flow is 20-26kg/h. And standing until the water-based primer is completely cured, wherein the complete curing refers to the complete drying of the water-based paint, and can be detected by touch drying.
And 4, repeating the process in the step 3 for 2 times to obtain the primer-attached furniture.
And 5, polishing the primer-attached furniture, namely polishing the surface of the primer-attached furniture by using 180-mesh sand paper, and polishing by using 400-mesh sand paper. And then, coating the water-based finish paint, and standing until the water-based finish paint is completely solidified, thus obtaining the finish paint attached furniture.
Step 6, grading polishing is carried out on the surface paint attached furniture by adopting mechanical polishing equipment, wherein the grading polishing is that 600-mesh sand paper is used for polishing, 1000-mesh sand paper is used for polishing, and 2000-mesh sand paper is used for polishing. And (3) cleaning, namely polishing without a polishing agent, polishing with the polishing agent, and finishing polishing to form a complete mirror effect on the surface of the cork furniture.
Polishing a pine board (with visible holes on the surface) according to the process to form a complete mirror effect on the surface of the pine board. After 6 months of accelerated aging test, the surface of the pine board was found to be slightly darkened, but no browning occurred.
In this example, the hole sealing agent is not used in the polishing process, and the complete mirror effect can be formed by polishing. In the process of coating water paint, bubbles are not easy to form, the phenomenon of rib rising can not occur, and a large number of burrs can not occur even if the water paint is polished to 400 meshes before the water paint is coated.
In this example, the test was performed according to the "wood surface anti-moths performance characterization test" with a mothproof pit distribution density of 5.5 pieces/dm.
Reference example 1
And step 1, polishing the surface of the cork furniture to be treated by using 180-mesh sand paper, and polishing by using 400-mesh sand paper to obtain coarse polished furniture.
And 2, coating the water-based primer on the surface of the rough polished furniture, standing and drying in the shade, and completely curing the water-based primer.
And 3, repeating the process in the step 2 for 2 times to obtain the primer-attached furniture.
And 4, polishing the primer-attached furniture, namely polishing the surface of the primer-attached furniture by using 180-mesh sand paper, and polishing by using 400-mesh sand paper. And then, coating the water-based finish paint, and standing until the water-based finish paint is completely solidified, thus obtaining the finish paint attached furniture.
Step 5, grading polishing is carried out on the surface paint attached furniture by adopting mechanical polishing equipment, wherein the grading polishing is that 600-mesh sand paper is used for polishing, 1000-mesh sand paper is used for polishing, and 2000-mesh sand paper is used for polishing. Cleaning, polishing without polishing agent, polishing with polishing agent, and finishing polishing.
A pine board (with visible holes on the surface) is polished according to the process, and a large number of air holes and ribs are obviously formed on the surface.
However, if a safflower pear wood board (the surface of which has visible holes) is polished according to the process, the polished safflower pear wood board has good surface mirror surface effect, and the surface of the safflower pear wood board has no large amount of air holes and has the phenomenon of rib rising.
As can be seen from examples 1 and 2 and reference example 1, the polishing process of the invention has good polishing effect on cork furniture, and solves the limitation of the existing polishing process on cork furniture polishing. However, the polishing process of examples 1 and 2 is not necessary for polishing hard wood furniture, and the polishing process of the conventional technique of reference example 1 can also be used for polishing to form a complete mirror effect.
Comparative example 1
The difference between this example and example 2 is that step 2 is omitted, i.e. no superacid diluent is used to treat the surface of the rough polished furniture, and the remainder are the same.
A piece of pine board (the surface of which is provided with visible holes) is polished according to the process, and a large number of air holes and ribs are obviously formed on the surface of the polished pine board.
Comparative example 2
The difference between this example and example 2 is that this example does not carry out dry ice blasting, and in step 3, the surface of the piece of pretreated furniture is coated with a water-based primer, and left to stand until the water-based primer is completely cured, and the remainder are the same.
A piece of pine board (the surface of which is provided with visible holes) is polished according to the process, and a large number of air holes and ribs are obviously formed on the surface of the polished pine board.
Comparative example 3
The difference between this example and example 2 is that the completely cured water-based primer was treated at the time of dry ice blasting, and in step 3, the pretreated furniture surface was coated with the water-based primer once and left to stand until the water-based primer was completely cured, and the dry ice blasting was performed 1 time by a dry ice blaster under a compressed air pressure of 0.38MPa, a dry ice particle diameter of 1.5 to 3mm and a dry ice flow rate of 20 to 26kg/h. Standing until the dry ice is completely volatilized, and ending. The remaining steps are the same.
Polishing a pine board (with visible holes on the surface) according to the process, wherein the polished pine board surface has obvious matte phenomenon and rib rising phenomenon. The reason is probably because the cured paint layer cannot be modified even by dry ice blasting, and the bottommost paint layer is damaged, and even if polished, only a matte polished surface can be formed.
Comparative example 4
This example differs from example 2 only in that 0.01mol/L sodium hydroxide solution is used instead of the superacid diluent, the remainder being identical.
And (3) taking the fir board as a sample board, treating according to the process, and finally finding that the surface of the sample board becomes rough and crack collapse/shrinkage occurs.
Comparative example 5
This example differs from example 2 only in that 0.0001mol/L perchloric acid solution was used instead of the superacid diluent, the remainder being identical.
In this case, it was found that the wood surface would yellow or even black if the concentration of the perchloric acid solution was too high. The surface of the wood is treated by 0.0001mol/L perchloric acid solution, and the surface of the wood has no abnormal color.
The surface of a pine board (the surface of which is provided with visible holes) is polished according to the process, the polished surface of the pine board has good mirror surface effect, and the surface of the pine board is free from a large number of air holes and has the phenomenon of rib rising. However, after 6 months of accelerated aging test, the surface of the pine board was found to be brown.
The test was carried out according to the "test for characterizing the anti-moths properties of the wood surface", and the distribution density of the moths pits was 23.1/dm.
Comparative example 6
This example differs from example 2 only in that the 0.003mol/L sulfuric acid solution is used instead of the superacid diluent, the remainder being identical.
In this case, it was found that if the concentration of the sulfuric acid solution is too high, the wood surface may yellow or even black. The surface of the wood is treated by 0.003mol/L perchloric acid solution, and the surface of the wood is free from abnormal color.
A piece of pine board (the surface of which is provided with visible holes) is polished according to the process, and a large number of air holes and ribs are obviously formed on the surface of the polished pine board.
The test was carried out according to the "test for characterization of the anti-moths properties on the surface of wood", with a distribution density of the pits of the wood of 27.4/dm.
Comparative example 7
Based on example 2, by varying the concentration of the super acidic diluent, the corresponding worm-eaten pit distribution density results are shown in table 1:
TABLE 1
| Aqueous solution mass fraction (%) | Distribution density of worm-eaten pit (individual/dm) |
| 0.00007 | 10.2 |
| 0.000072 | 7.3 |
| 0.000074 | 6.6 |
| 0.000076 | 5.5 |
| 0.000078 | 5.7 |
| 0.00008 | 6.9 |
As can be seen from Table 1, preferably, the super acidic diluent is selected to be a 0.000076% aqueous solution of trifluoromethanesulfonic acid by mass.
Test for characterization of wood surface anti-moths performance
1) Selecting a sample plate (for example, acidizing in the step 2 of the processes of the example 2, the comparative examples 5-7 and the like, wherein the sample plate is a pine board which is not resistant to worm damage), placing the sample plate in a glass tank, covering the surface of the sample plate in the glass tank with soil, pouring about 200-300 termites or termites into the glass tank, covering a ventilation cover on the glass tank, placing the glass tank in a constant temperature and humidity box for culturing for 1 week, checking once a day, and supplementing sterile water if necessary to maintain the humidity of sandy soil.
2) And after the culture is finished for 1 week, taking out the sample plate in the glass groove, cleaning the surface of the sample plate, observing worm-eaten pits on the surface of the sample plate, and counting.
3) And a control group test is adopted, and a sample plate used in the control group is treated by a water-soluble preservative (ammonia-soluble copper quaternary ammonium salt) and has a strong anti-worm-eaten effect.
The test result of the control group shows that the distribution density of worm-eaten pits is 5.2/dm. For the sample plate, if the distribution density of the worm-eaten pits is about 5.2/dm, the sample plate has good worm-eaten resistance. If the distribution density of the worm-eaten pits is far more than 5.2/dm, the worm-eaten resistance is poor.
In the polishing process of cork furniture, firstly, the timber is acidified by adopting super acid diluent, and secondly, when the water-based primer reaches semi-solidification, dry ice sand blasting is carried out, and the two means are matched in a synergistic way, so that the following effects can be achieved:
1) Acidizing the super acidic diluent, carrying out ten-million-level dilution on the trifluoro methanesulfonic acid, and the acidizing process of the super acidic can selectively degrade a part of lignin and generate more polyhydroxy, so that hydrogen bonds and chemical bonds among fibers are promoted, and the bonding between the subsequent water-based primer and the fibers is facilitated.
2) The dry ice sand blasting treatment can modify the semi-cured paint layer, on one hand, dehydration and curing can be accelerated, on the other hand, dry ice particles impact the surface at high speed in compressed air flow, so that a dynamic effect, a thermal effect and a sublimation effect can be generated, the surface property of the paint layer and the surface property of wood fibers can be obviously influenced, the wood fibers are acidified and impacted by dry ice sand blasting, and the rib rising phenomenon can be effectively eliminated.
3) In the polishing process, hole sealing is carried out on cork furniture without using hole sealing agents such as epoxy resin glue and the like, other micropores of wood cannot be blocked, and the bonding effect between the primer and the wood is good.
4) Because the dry ice sand blasting technology is adopted to improve the surface properties of the fiber and the paint layer before the primer is solidified, compact structures can be formed at the junction of the fiber and the paint layer, a large number of tiny scattered fibers are not easy to occur, and a large number of burrs can not occur even if the fiber is polished to 400 meshes before the water-based primer is brushed.
5) And the dry ice blasting treatment is carried out when the acidification of the super acidic diluent and the water-based primer reach semi-solidification, and the two are indispensable, otherwise, the complete mirror effect cannot be formed.
6) The cork which is acidified by super acidic diluent can react with some components in the wood due to the activity and acidity of super acidic diluent, so that insect-resistant components are generated, and the other acids, even the acidification of perchloric acid, can not achieve the effect of insect resistance.
In the above examples, both the water-borne base coat and the water-borne top coat were purchased from Shandong New Material Co., ltd.
Furthermore, it should be understood that those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims (9)
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| CN106625932A (en) * | 2016-12-06 | 2017-05-10 | 阜阳市伟叶家具有限公司 | Antique finish treatment method for wood furniture |
| CN107116017A (en) * | 2017-04-21 | 2017-09-01 | 黑龙江凯恩琪新材料科技有限公司 | It is a kind of can the lasting super-amphiphobic coating of freezing preparation method |
| CN109127336A (en) * | 2018-08-06 | 2019-01-04 | 浙江大风范家具股份有限公司 | A kind of aqueous spun gold line paint coating process |
| CN111231041A (en) * | 2020-01-09 | 2020-06-05 | 安徽美之然木业有限公司 | Process for improving performance of cork floor paint film |
| CN116515063A (en) * | 2023-05-29 | 2023-08-01 | 北京联合大学 | Solid phase microextraction adsorbent for pyrethroid pesticide |
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