A process for polishing softwood furniture surfaces

Abstract

The present application relates to a kind of softwood furniture surface polishing process, belong to furniture polishing field.The present application is acidified by using superacid diluent on the surface of rough polishing furniture, then water-based primer is applied, when water-based primer reaches semi-curing, dry ice sand blasting treatment is used;Finally, water-based finish is applied again, grading polishing, cleaning, polishing without polishing agent, polishing with polishing agent.The present application is particularly suitable for polishing softwood furniture, even if the primer and finish used are water-based paint, there are visible holes on the surface of furniture board, without using pore sealing agent during polishing, it can also polish to form complete mirror effect.During the process of applying water-based paint, it is not easy to form bubbles, and there is no ribbing phenomenon;Even if it is polished to 400 mesh before applying water-based primer, there will be no a large number of burrs;Therefore, it can significantly reduce the subsequent polishing difficulty.

Description

Technical Field

[0001] This invention relates to the field of furniture polishing technology, specifically a polishing process for the surface of cork furniture. Background Technology

[0002] In the field of furniture polishing, the general polishing process follows the following procedure:

[0003] 1. Substrate preparation

[0004] Pre-treatment of the board material, such as cutting, edge banding, grooving, and lamination, is carried out to ensure that its size and shape meet the design requirements.

[0005] 2. Roughly grind the surface (e.g., 120 grit) to remove sawdust and impurities, then finely sand it with fine sandpaper (e.g., 180 grit, 400 grit, etc.) to make the surface smooth and free of scratches.

[0006] 3. Primer application

[0007] Use a water-based primer and apply it evenly using spray or roller coating equipment. The main function of the primer is to improve the adhesion of the topcoat and seal the pores of the wood.

[0008] The primer dries in about 8 minutes, and the surface smoothness remains basically unchanged after drying.

[0009] 4. Topcoat application

[0010] A dry reciprocating spray gun or a two-roller coater is typically used for uniform coating. The topcoat drying time is approximately 6.5 to 7 minutes.

[0011] 5. Drying / Curing

[0012] Depending on the properties of the paint, drying may be required.

[0013] For water-based paints, natural air drying (5–7 hours) or low-temperature drying is often used to ensure that the paint film hardens evenly.

[0014] 6. Polishing

[0015] Mechanical polishing equipment (abrasives, grinding tools) is used for multi-stage processing from coarse grinding to fine grinding. First, coarser particles are used to remove surface imperfections (e.g., 240-400 grit sandpaper), then 600-1000 grit sandpaper is used for polishing, and finally fine particles (e.g., 1500 grit or higher) are used for fine polishing to improve surface gloss and achieve the desired smoothness.

[0016] Finally, polishing is done without using polishing compound initially. Polishing compound is then applied later. Finally, remove any remaining dust with a soft cloth or clean brush to ensure the paint film surface is clean.

[0017] For furniture polishing, spraying primer, topcoat generally use spray and brush.

[0018] Spraying is the use of airless spray gun, through the pressure directly sprayed from the gun barrel, latex paint is sprayed from the mouth of the fog, can be uniformly adhered and absorbed by the wall. The advantage is that there is no brush marks, which is not possible for brushing. High efficiency, is 10-16 times of brushing. The disadvantage is that the corners and gaps are difficult to paint; very expensive paint (relative to brushing), and if there is a knock, the color difference needs to be repaired more obvious than brushing.

[0019] Brushing needs to be operated step by step, low efficiency and labor intensive. It is easy to leave brush marks, easy to appear uneven film thickness and other phenomena, therefore, the difficulty of subsequent polishing and polishing is large. The advantage is that, compared with spraying, it can save paint, and the paint after brushing has a better texture, which is more suitable for high-end furniture.

[0020] For hardwood, whether the paint is water-based paint, whether it is sprayed, brushed, whether the furniture material surface has visible holes (wood surface often appears about 1-2mm diameter small round hole, these are mostly insect activity left traces; some softwood also has larger texture gap due to climate and other reasons, easy to appear about 1-2mm diameter small hole, these small holes because the naked eye can be seen, collectively known as visible holes), when spraying and brushing primer, it is easy to seal the holes on the surface of the furniture material, the sealing effect is good, and the combination between the primer and the furniture material is good.

[0021] However, for softwood, if only painting is adopted, and both the primer and the topcoat are water-based paints, such as water-based acrylic primer and topcoat, it is difficult to polish to form a complete mirror effect without using an additional pore sealer to seal the surface of the furniture material. Before painting the primer, a pore sealer (such as epoxy resin glue) is generally used to seal the pores. If the pores are not sealed, on the one hand, when the water-based paint is painted on the visible pores, air bubbles will be formed, which can generally be eliminated only by vacuum treatment, and the vacuum operation is very expensive; on the other hand, after the wood absorbs water, a large area of deformation will occur near the visible pores, and in severe cases, the phenomenon of raised grain will occur, which makes it necessary to significantly increase the thickness of the primer, otherwise the ideal polishing effect cannot be formed; the primer is too thick, and when the epoxy resin glue is used for sealing, a part of the other micropores of the wood will also be sealed, which will reduce the bonding effect between the primer and the wood. Finally, due to the texture of some softwood, when it is polished to 400 mesh, a large number of burrs will appear near the visible pore sealing area when the water-based primer is painted, which may be due to the fact that the texture and hardness of the cured epoxy resin are different from those of the wood, and a large number of small and scattered fibers will appear at the junction during polishing, which will form burrs when the water-based primer is painted. For this case, the polishing is generally stopped at 240 mesh, but this will affect the bonding force between the subsequent primer and the wood; if the polishing is stopped at 400 mesh and a large number of burrs appear, the burrs will be removed by continuous polishing and modification, and then the water-based primer will be painted again, and the polishing will be repeated for at least 8-12 times, so that the burrs can be eliminated, which is very time-consuming, labor-intensive and material-consuming, and the polishing is very difficult.

[0022] Based on this, the present application is proposed. SUMMARY

[0023] The present application provides a softwood furniture surface polishing process to overcome the shortcomings of the prior art, and the technical scheme is as follows:

[0024] A softwood furniture surface polishing process, comprising the following steps:

[0025] Step 1, polishing the surface of the softwood furniture to be treated to obtain a rough polished furniture;

[0026] Step 2, brushing the surface of the rough polished furniture with a super strong acid diluent, and obtaining a pretreated furniture after the rough polished furniture is dried;

[0027] Step 3, painting a layer of water-based primer on the surface of the pretreated furniture, and using dry ice sand blasting when the water-based primer reaches semi-curing, and standing until the water-based primer is completely cured;

[0028] Step 4, repeat step 3 process 0~2 times to get primer-attached furniture; the number of repetitions can be adjusted according to the required paint film thickness.

[0029] Step 5, polish the primer-attached furniture, then apply water-based topcoat, and let it stand until the water-based topcoat is completely cured to get topcoat-attached furniture.

[0030] Step 6, use mechanical polishing equipment to polish the topcoat-attached furniture in stages, clean, polish without polishing agent, and polish with polishing agent.

[0031] As a further scheme of the present application, the super acid diluent is a mass fraction of 0.000076% trifluoromethanesulfonic acid aqueous solution.

[0032] As a further scheme of the present application, the dry ice blasting machine is used for dry ice blasting treatment, the compressed air pressure during dry ice blasting is 0.35-0.38 MPa, the dry ice particle diameter is 1.5-3 mm, and the dry ice flow rate is 20-26 kg / h.

[0033] As a further scheme of the present application, in step 2, the rough polishing furniture drying temperature is not more than 22℃.

[0034] As a further scheme of the present application, in step 1, first use 120~180 mesh sandpaper to polish the surface of the softwood furniture to be processed, and then use 240~400 mesh sandpaper to polish to get rough polishing furniture; specifically, 120, 180, 240, 400 mesh sandpaper can be selected according to needs.

[0035] As a further scheme of the present application, in step 5, the primer-attached furniture is polished, first using 180 mesh sandpaper to polish the surface of the primer-attached furniture, and then using 400 mesh sandpaper to polish.

[0036] As a further scheme of the present application, the wood of the softwood furniture to be processed is one or more of pine, Chinese fir, cypress, poplar, birch, and rubberwood.

[0037] As a further scheme of the present application, in step 6, the polishing in stages is first using 600 mesh sandpaper, then using 800~1000 mesh sandpaper, and finally using 1500~2000 mesh sandpaper.

[0038] As a further scheme of the present application, in step 6, polishing without polishing agent means that no polishing agent is used during polishing.

[0039] As a further scheme of the present application, in step 6, polishing with polishing agent means that a polishing agent is used during polishing.

[0040] Compared with the prior art, the present application has the following advantages:

[0041] 1. This invention is particularly suitable for polishing cork furniture. Even if both the primer and topcoat are water-based, and the furniture board surface has visible pores, a complete mirror finish can be achieved without the need for a sealing agent during polishing. During the application of water-based paint, bubbles are less likely to form, and no burrs will appear. Even when sanding to 400 grit before applying the water-based primer, there will be minimal burrs. Therefore, the difficulty of subsequent polishing can be significantly reduced.

[0042] 2) When the super acid diluent and the water-based primer reach semi-cured, dry ice sandblasting is performed. Both are indispensable; otherwise, a complete mirror effect cannot be formed.

[0043] 3) Cork furniture treated with super acid diluted solution has a good resistance to insects and borers. Detailed Implementation

[0044] The present invention will be described in detail below with reference to specific embodiments. These embodiments are merely some, not all, implementations of the present invention. All other implementations obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] Step 1: First, use 180-grit sandpaper to sand the surface of the cork furniture to be treated, and then use 400-grit sandpaper to sand it to obtain coarse sanded furniture.

[0047] Step 2: Apply a diluted superacid solution (0.000076% trifluoromethanesulfonic acid aqueous solution) to the surface of the coarsely sanded furniture. Then, allow the coarsely sanded furniture to air dry in the shade, ensuring the drying temperature does not exceed 22°C. Once the furniture is dry, the pre-treated furniture is obtained. The drying test can be performed using a simple method such as "touch dryness".

[0048] Step 3: Apply a coat of water-based primer to the pre-treated furniture surface. When the primer reaches semi-cured state, perform a dry ice blasting treatment once. The compressed air pressure during dry ice blasting is 0.35 MPa, the dry ice particle diameter is 1.5-3 mm, and the dry ice flow rate is 20-26 kg / h. Allow to stand until the water-based primer is completely cured; the primer will then adhere to the furniture. Complete curing means the water-based paint is completely dry, which can be tested by "touch-drying".

[0049] “semi-cured” refers to that the water-based paint has lost most of the solvent in the drying process, the film layer begins to form, but the cross-linking or film-forming reaction has not been completed. At this time, the paint layer has a certain strength, but it can still be completely cured by subsequent heating, drying or natural aging to form a complete film layer resistant to wear and chemical corrosion.

[0050] The detection method of semi-cured is that the pretreated furniture is coated with a water-based primer, and the curing time is shortened to make the paint layer semi-cured. The specific method is that under the same environment, a layer of water-based primer is also coated on a sample plate at the same time. After curing for 2 minutes, the paint layer has very high viscosity. At this time, a 3.2x2.2x0.6cm eraser (mass 17g) is attached to the sample plate (the eraser is stuck by the adhesion of the paint layer). As the curing degree deepens, the eraser of a certain size and gram weight falls off the sample plate naturally, indicating that the water-based primer has reached the semi-cured degree.

[0051] Step 4, polishing the furniture with the primer attached. First, use 180 mesh sandpaper to polish the surface of the furniture with the primer attached, and then use 400 mesh sandpaper to polish. Then, apply the water-based topcoat and let it stand until the water-based topcoat is completely cured to obtain the furniture with the topcoat attached.

[0052] Step 5, using a mechanical polishing device to polish the furniture with the topcoat attached. The step-by-step polishing is first using 600 mesh sandpaper, then using 800 mesh sandpaper, and finally using 1500 mesh sandpaper. Cleaning, first polishing without polishing agent, and then polishing with polishing agent; after polishing, the surface of the softwood furniture forms a complete mirror effect.

[0053] In this example, the polishing process does not use a pore sealing agent, and a complete mirror effect can be formed. During the application of the water-based paint, it is not easy to form bubbles and there is no ribbing phenomenon; before applying the water-based primer, even if the polishing is to 400 mesh, there will be no large amount of burrs.

[0054] Example 2

[0055] Step 1, first use 180 mesh sandpaper to polish the surface of the softwood furniture to be treated, and then use 400 mesh sandpaper to polish to obtain the rough polished furniture.

[0056] Step 2, brushing the surface of the rough polished furniture with super strong acid diluent, which is a mass fraction of 0.000076% trifluoromethanesulfonic acid aqueous solution. Then, the rough polished furniture is air dried at a drying temperature not exceeding 22°C; after the rough polished furniture is dried, the pretreated furniture is obtained. The drying detection standard here can be realized by a simple detection method such as "touch dry".

[0057] Step 3, apply one coat of water-based primer on the pretreated furniture surface, and when the water-based primer is semi-cured, use a dry ice blasting machine to perform dry ice blasting treatment once, the compressed air pressure during dry ice blasting is 0.38 MPa, the dry ice particle diameter is 1.5-3 mm, and the dry ice flow rate is 20-26 kg / h. Let stand until the water-based primer is completely cured; complete curing refers to that the water-based paint is completely dry, which can be detected by "touch dry".

[0058] Step 4, repeat the process of step 3 twice to obtain the furniture with primer adhesion.

[0059] Step 5, polish the furniture with primer adhesion, first use 180 mesh sandpaper to polish the surface of the furniture with primer adhesion, and then use 400 mesh sandpaper to polish. Then, apply water-based topcoat, and let stand until the water-based topcoat is completely cured to obtain the furniture with topcoat adhesion.

[0060] Step 6, use a mechanical polishing device to polish the furniture with topcoat adhesion, first use 600 mesh sandpaper, then use 1000 mesh sandpaper, and finally use 2000 mesh sandpaper. Clean, first polish without polishing agent, and then polish with polishing agent; after polishing, the surface of the softwood furniture forms a complete mirror effect.

[0061] A pine board (with visible holes on the surface) is polished according to the above process to form a complete mirror effect on the surface of the pine board. After 6 months of accelerated aging test, it is found that the color of the pine board surface is slightly darker, but no browning occurs.

[0062] In this example, the hole sealing agent is not used during polishing, and a complete mirror effect can still be polished. During the application of water-based paint, it is not easy to form bubbles and no ribbing phenomenon occurs; even if polished to 400 mesh, a large number of burrs will not occur before applying the water-based primer.

[0063] In this example, according to the "Wood surface anti-termite performance characterization test", the distribution density of termite holes is 5.5 per dm.

[0064] Reference Example 1

[0065] Step 1, first use 180 mesh sandpaper to polish the surface of the softwood furniture to be treated, and then use 400 mesh sandpaper to polish to obtain the furniture with rough polishing.

[0066] Step 2, apply one coat of water-based primer on the surface of the furniture with rough polishing, and let stand to dry, and the water-based primer is completely cured.

[0067] Step 3, repeat the process of step 2 twice to obtain the furniture with primer adhesion.

[0068] Step 4, polishing the primer-attached furniture, first polishing the surface of the primer-attached furniture using 180 mesh sandpaper, and then polishing using 400 mesh sandpaper. After that, applying water-based topcoat, and standing until the water-based topcoat is completely cured to obtain the topcoat-attached furniture.

[0069] Step 5, grading polishing the topcoat-attached furniture using a mechanical polishing device, grading polishing is first polishing using 600 mesh sandpaper, then polishing using 1000 mesh sandpaper, and finally polishing using 2000 mesh sandpaper. Cleaning, first polishing without polishing agent, and then polishing with polishing agent; polishing is finished.

[0070] Polishing a pine board (the surface of which has visible holes) according to the above process, the surface of the polished pine board obviously has a large number of pores and appears to have raised lines.

[0071] However, if a red rosewood board (the surface of which has visible holes) is polished according to the above process, the surface of the polished red rosewood board has good mirror effect, and the surface does not have a large number of pores and raised lines.

[0072] From Examples 1 and 2 and Reference Example 1, it can be seen that the polishing process of the present application has good polishing effect on softwood furniture; it solves the limitations of the existing polishing process on softwood furniture polishing. However, it is unnecessary to use the polishing process of Examples 1 and 2 for polishing hardwood furniture, and the conventional technology of Reference Example 1 can also be used for polishing to form a complete mirror effect.

[0073] Comparative Example 1

[0074] The difference between this example and Example 2 is only that this example omits Step 2, i.e., does not treat the surface of the rough polished furniture with a super strong acid diluent, and the rest are the same.

[0075] Polishing a pine board (the surface of which has visible holes) according to the above process, the surface of the polished pine board obviously has a large number of pores and appears to have raised lines.

[0076] Comparative Example 2

[0077] The difference between this example and Example 2 is only that this example does not perform dry ice sandblasting treatment, and in Step 3, a layer of water-based primer is applied on the surface of the pretreated furniture and is left to stand until the water-based primer is completely cured; the rest are the same.

[0078] Polishing a pine board (the surface of which has visible holes) according to the above process, the surface of the polished pine board obviously has a large number of pores and appears to have raised lines.

[0079] Comparative Example 3

[0080] The difference between this example and Example 2 is that, in this example, the completely cured water-based primer is treated by dry ice blasting, and in Step 3, the water-based primer is applied on the pretreated furniture surface and left until the water-based primer is completely cured; the dry ice blasting is performed once by using a dry ice blasting machine, and the compressed air pressure during dry ice blasting is 0.38 MPa, the dry ice particle diameter is 1.5-3 mm, and the dry ice flow rate is 20-26 kg / h. The surface is left until the dry ice is completely volatilized, and the process is ended. The remaining steps are the same.

[0081] A pine board (with visible pores on the surface) is polished according to the above process, and the surface of the polished pine board is obviously matt and has raised lines. The reason can be that the cured paint layer cannot be modified even by dry ice blasting, and the bottommost paint layer is damaged, so that even polishing can only form a matt polishing surface.

[0082] Comparative Example 4

[0083] The difference between this example and Example 2 is that, in this example, 0.01 mol / L sodium hydroxide solution is used instead of the super strong acid diluent, and the remaining steps are the same.

[0084] A Chinese fir board is treated according to the above process, and finally it is found that the surface of the sample board is rough and has cracks, collapse / shrinkage.

[0085] Comparative Example 5

[0086] The difference between this example and Example 2 is that, in this example, 0.0001 mol / L perchloric acid solution is used instead of the super strong acid diluent, and the remaining steps are the same.

[0087] In this example, it is found that if the concentration of the perchloric acid solution is too high, the wood surface will turn yellow or even black. When the wood surface is treated with 0.0001 mol / L perchloric acid solution, the wood surface has no color difference.

[0088] A pine board (with visible pores on the surface) is polished according to the above process, and the surface of the polished pine board has good mirror effect, and there are no a large number of pores and raised lines on the surface. However, after 6 months of accelerated aging test, it is found that the surface of the pine board has browned.

[0089] According to the "Wood surface anti-termite performance characterization test", the distribution density of termite holes is 23.1 per dm.

[0090] Comparative Example 6

[0091] The difference between this example and Example 2 is that, in this example, 0.003 mol / L sulfuric acid solution is used instead of the super strong acid diluent, and the remaining steps are the same.

[0092] It is found that the wood surface will be yellow or even black if the concentration of the sulfuric acid solution is too high. The wood surface is not discolored when the wood surface is treated with 0.003 mol / L of the perchloric acid solution.

[0093] A pine board (having visible pores on the surface) is polished according to the above process. After polishing, a large number of pores and a ribbing phenomenon are obviously present on the surface of the pine board.

[0094] According to the "Wood surface anti-termite performance characterization test", the termite hole distribution density is 27.4 per dm.

[0095] Comparative Example 7

[0096] Based on Example 2, the concentration of the superacid diluent is changed, and the corresponding termite hole distribution density results are shown in Table 1:

[0097] Table 1

[0098]

[0099] As shown in Table 1, preferably, the superacid diluent is selected as a 0.000076% triflic acid aqueous solution.

[0100] Wood surface anti-termite performance characterization test

[0101] 1) Select a sample board (for example, the sample board is subjected to acid treatment according to Step 2 of the process of Example 2, Comparative Examples 5-7, etc.; the sample board is a pine board that is not resistant to termite attack), place it in a glass tank, cover the surface of the sample board in the glass tank with soil, then pour about 200-300 white ants or termites into the glass tank, cover the glass tank with a breathable cover, and place it in a constant temperature and humidity chamber for 1 week, check it once a day, and if necessary, supplement sterile water to maintain the moisture of the sand.

[0102] 2) After 1 week of culture, remove the sample board in the glass tank, clean the surface of the sample board, and observe and count the termite holes on the surface of the sample board.

[0103] 3) A control group test is used. The sample board used in the control group is treated with a water-soluble preservative (ammonia copper quaternary ammonium salt), which has a strong anti-termite effect.

[0104] Control group test results: the termite hole distribution density is 5.2 per dm. If the termite hole distribution density of the sample board is about 5.2 per dm, it means that the sample board has good anti-termite performance. If the termite hole distribution density is much greater than 5.2 per dm, it means that the anti-termite performance is poor.

[0105] In the present application, during the polishing process of softwood furniture, first, the wood is acidified by using a super strong acid diluent, and second, when the water-based primer reaches semi-curing, dry ice sand blasting treatment is carried out. These two methods work together to achieve the following effects:

[0106] 1) Acidification by super strong acid diluent: triflic acid is diluted by millions of times. The acidification process of super strong acid can selectively degrade part of lignin and produce more hydroxyl groups, promoting hydrogen bonding and chemical bonding between fibers, which is beneficial to the bonding between the subsequent water-based primer and the fibers.

[0107] 2) Dry ice sand blasting treatment can modify the semi-cured paint layer. On the one hand, it can accelerate dehydration and curing, and on the other hand, dry ice particles collide with the surface at high speed in the compressed air stream, producing dynamic effect, thermal effect, and sublimation effect, which can significantly affect the surface properties of the paint layer and the wood fibers. Wood fibers are first acidified and then impacted by dry ice sand blasting, which can effectively eliminate the ribbing phenomenon.

[0108] 3) During the polishing process, no hole sealing agent such as epoxy resin glue is used for softwood furniture, which will not block other micro-holes of the wood, and the bonding effect between the primer and the wood is good.

[0109] 4) Because dry ice sandblasting technology is used to improve the surface properties of fibers and paint layers before the primer is cured, the interface between the fibers and the paint layer can form a dense structure, and it is not easy to appear a large number of scattered fibers. Even if it is polished to 400 mesh before brushing the water-based primer, a large number of burrs will not appear.

[0110] 5) Super strong acid diluent acidification and dry ice sandblasting treatment when the water-based primer reaches semi-curing are indispensable, otherwise the complete mirror effect cannot be formed.

[0111] 6) The softwood treated by super strong acid diluent acidification may react with some components in the wood due to the activity and acidity of the super strong acid, thereby generating anti-insect components. Other acids, even high-chloric acid acidification, cannot achieve the effect of anti-insect boring.

[0112] In the above embodiments, the water-based primer and the water-based topcoat are purchased from Shandong Ruixi New Material Co., Ltd.

[0113] In addition, it should be understood that those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A process for polishing softwood furniture surfaces, characterized by: The method comprises the following steps: Step 1, polishing the surface of the softwood furniture to be treated to obtain a rough polished furniture; Step 2, brushing the surface of the rough polished furniture with a superacid diluent, and obtaining a pretreated furniture after the rough polished furniture is dried; Step 3, brushing the surface of the pretreated furniture with a water-based primer, and performing dry ice sand blasting when the water-based primer is semi-cured, and then standing until the water-based primer is completely cured; Step 4, repeating the process of step 3 for 0-2 times to obtain a primer-attached furniture; Step 5, polishing the primer-attached furniture, then applying a water-based topcoat, and standing until the water-based topcoat is completely cured to obtain a topcoat-attached furniture; Step 6, grading polishing the topcoat-attached furniture by using a mechanical polishing device, cleaning, polishing without polishing agent, and polishing with polishing agent. The superacid diluent is a trifluoromethanesulfonic acid aqueous solution with a mass fraction of 0.000076%.

2. A process for polishing a softwood furniture surface according to claim 1, characterized in that: The dry ice sand blasting is performed by using a dry ice sand blasting machine, the compressed air pressure during the dry ice sand blasting is 0.35-0.38 MPa, the dry ice particle diameter is 1.5-3 mm, and the dry ice flow rate is 20-26 kg / h.

3. A process for polishing a softwood furniture surface as claimed in claim 1, wherein: In step 2, the drying temperature of the rough polished furniture is not higher than 22℃.

4. A process for polishing a softwood furniture surface as claimed in claim 1, wherein: In step 1, the surface of the softwood furniture to be treated is polished by using 120-180 mesh sandpaper first, and then polished by using 240-400 mesh sandpaper to obtain the rough polished furniture.

5. A process for polishing a softwood furniture surface as claimed in claim 1, wherein: In step 5, the surface of the primer-attached furniture is polished by using 180 mesh sandpaper first, and then polished by using 240-400 mesh sandpaper.

6. A process for polishing a softwood furniture surface as defined in claim 1, wherein: The wood of the softwood furniture to be treated is one or more of pine wood, fir wood, cypress wood, poplar wood, birch wood, and rubber wood.

7. A process for polishing a softwood furniture surface as defined in claim 1, wherein: In step 6, the grading polishing is performed by using 600 mesh sandpaper first, then using 800-1000 mesh sandpaper, and finally using 1500-2000 mesh sandpaper.

8. A process for polishing a softwood furniture surface as defined in claim 1, wherein: In step 6, the polishing without polishing agent means that no polishing agent is used during polishing.

9. A process for polishing a softwood furniture surface as defined in claim 1, wherein: In step 6, the polishing with polishing agent means that a polishing agent is used during polishing.

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