PVC edge sealing strip suitable for soft forming edge sealing machine and preparation method of PVC edge sealing strip

Abstract

The invention relates to the technical field of PVC edge sealing strips, in particular to a PVC edge sealing strip suitable for a soft forming edge sealing machine and a preparation method thereof.The PVC edge sealing strip is at least prepared from, by weight, 75-100 parts of PVC resin powder, 15-50 parts of filler, 3-6 parts of stabilizer, 3-6 parts of flexibilizer, 0.8-3.5 parts of acrylate copolymer and 0.5-1.5 parts of lubricant. The problems that gloss oil cracking, glue failure and the like are prone to occurring when an existing PVC edge sealing strip is subjected to high-temperature preheating and extrusion attaching through a soft forming edge sealing machine, and the appearance is affected are solved, the method is suitable for automatic production of the soft forming edge sealing strip, and the product reject ratio is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of PVC edge banding strips, in particular to a PVC edge banding strip suitable for a soft forming edge banding machine and a preparation method thereof. Background Art

[0002] With the development of social economy, people's requirements for quality of life are gradually increasing, and the requirements for furniture are gradually showing the pursuit of personalized, differentiated, light luxury and minimalist aesthetics and design concepts. Therefore, traditional, single metal handles are difficult to meet people's life needs. In order to adapt to the development of the furniture industry, soft forming edge banding technology has gradually matured and become an indispensable part of the furniture edge banding field. Soft forming edge banding technology is mainly used to process panels with formed edges or special-shaped edges, such as J-shaped, L-shaped, C-shaped, 45-degree oblique straight edges, arcs, half handles and other unconventional handle-free edge banding. Among them, the main edge banding equipment is the fully automatic soft forming edge banding machine, which has the characteristics of high efficiency and energy saving, high quality, and intelligent production. It adopts advanced power systems and control systems, which can achieve high efficiency and energy saving, and quickly and efficiently complete edge banding tasks of various shapes. While ensuring the quality and aesthetics of edge banding products, it can achieve 24-hour uninterrupted production and improve the production efficiency of enterprises.

[0003] Different from conventional straight edge banding, the soft forming edge banding machine needs to carry out special processes such as high temperature preheating and extrusion lamination on the edge banding in order to make the edge banding fit well on the different board sections. This puts higher requirements on the physical properties of the edge banding, especially the flexibility and high temperature resistance of the edge banding, in order to ensure the quality and aesthetics of the special-shaped edge banding products. For example, a Chinese patent (publication number CN108410080A) discloses a low-VOC, low-odor environmentally friendly PVC edge banding material and its preparation method, which mainly reduces the probability of PVC degradation by lowering the processing temperature and thus reduces the production of easily decomposable small molecules, ensuring that the PVC edge banding material has the advantages of low VOC, low odor and good strength. A Chinese patent (publication number CN117946485A) discloses a high softening point PVC edge banding and its preparation method, which improves the softening point and heat resistance of the matrix by optimizing the formula. The above materials cannot meet the application requirements of special processes such as high temperature preheating and extrusion lamination of the soft forming edge banding machine. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine. By optimizing the product formula, the problem that the existing PVC edge banding strips are prone to cracking of varnish and debonding after high-temperature preheating and extrusion bonding in the soft forming edge banding machine, which affects the appearance, is solved. The invention is suitable for the automated production of soft forming edge banding strips and reduces the product defective rate.

[0005] On the one hand, the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine, which comprises at least the following raw materials, by weight: 75-100 parts of PVC resin powder, 15-50 parts of filler, 3-6 parts of stabilizer, 3-6 parts of toughening agent, 0.8-3.5 parts of acrylic copolymer, and 0.5-1.5 parts of lubricant.

[0006] As a preferred technical solution, the average polymerization degree of the PVC resin powder is 850-1250, preferably 950-1150, the model is SG-5, Inner Mongolia Junzheng Energy Chemical Group Co., Ltd.

[0007] As a preferred technical solution, the particle size of the filler is 1500-2500 mesh, preferably 2000-2500 mesh.

[0008] As a preferred technical solution, the filler is at least one of heavy calcium carbonate and light calcium carbonate.

[0009] As a preferred technical solution, the stabilizer is selected from at least one of a calcium zinc stabilizer, a lead salt stabilizer, and an organic tin stabilizer, preferably a calcium zinc stabilizer.

[0010] As a preferred technical solution, the toughening agent is at least one of methyl methacrylate-butadiene-styrene terpolymer (MBS) and chlorinated polyethylene (CPE).

[0011] Preferably, the methyl methacrylate-butadiene-styrene terpolymer is selected from at least one of M31, M41, M51, M61, MHT, M48, and M94S, preferably M51.

[0012] Preferably, the chlorinated polyethylene is selected from at least one of CPE-135A, CPE-B, CPE-135C, and CPE-Y, preferably CPE-135A.

[0013] As a preferred technical solution, the melt flow rate (230° C., 2.16 kg weight) of the acrylic copolymer is 2-10 g / 10 min.

[0014] As a preferred technical solution, the mass ratio of the acrylic copolymer to the PVC resin powder is (0.8-2.5):(75-100).

[0015] As an example, the mass ratio of the acrylic copolymer to the PVC resin powder is 0.8:75, 0.8:80, 0.8:90, 0.8:100, 1:75, 1:80, 1:90, 1:100, 2:75, 2:80, 2:90, 2:100, 2.5:75, 2.5:80, 2.5:90, and 2.5:100.

[0016] As a preferred technical solution, the lubricant at least includes oxidized wax and polyethylene wax.

[0017] Preferably, the mass ratio of the oxidized wax to the polyethylene wax is (0.2-0.6):1.

[0018] As an example, the mass ratio of the oxidized wax to the polyethylene wax is 0.2:1, 0.3:1, 0.4:1, 0.5:1, or 0.6:1.

[0019] The PVC edge banding provided by the present invention belongs to hard PVC and does not contain oil plasticizers. Based on the consideration of extrusion fluidity, PVC resin powder with a low average polymerization degree is used in the early stage. Although it can effectively improve the processing performance, the product is relatively brittle, especially in winter when the ambient temperature is relatively low. In the processing processes such as pre-milling, trimming, drilling, and slotting of the edge banding, the problem of corner collapse is prone to occur. In the process of exploration, the present invention found that by using PVC resin powder with an average polymerization degree of 950-1150 and matching heavy calcium carbonate or light calcium carbonate with a particle size of 1500-2500 mesh, the processability of the product is guaranteed while meeting the actual processing requirements of subsequent pre-milling, trimming, drilling, slotting and other processing processes of the edge banding, thereby reducing the product defect rate. However, if the average polymerization degree of the PVC resin powder is too high, the temperature resistance of the product will be reduced; if the heavy calcium carbonate or light calcium carbonate is too fine, it is easy to agglomerate, resulting in product appearance defects.

[0020] Furthermore, the present invention effectively improves the toughness of the product by introducing MBS or CPE and controlling the addition amount. In the subsequent process of extrusion bonding using a soft forming edge banding machine (processing J-shaped, L-shaped, C-shaped, 45-degree oblique straight edge, arc-shaped, half-handle and other unconventional special-shaped panels), it can ensure the perfect bonding between the edge banding strip and the board and avoid the problem of debonding. If the addition amount of MBS or CPE is too high, the Vicat softening point of PVC will be reduced, and it will be easy to soften significantly during the high-temperature preheating of the edge banding, resulting in wrinkles on the surface during the bonding process, and the edge banding strip will shrink beyond the standard, resulting in debonding at both ends of the furniture board; if the addition amount of MBS or CPE is too small, cracking and corner collapse will easily occur during edge banding.

[0021] In addition, the present invention improves demoulding properties, reduces adhesion of the melt to processing equipment, reduces production dark lines and charring, reduces shear heat generation during processing, improves melt fluidity, and improves production efficiency by introducing lubricants including oxidized wax and polyethylene wax, in conjunction with process step design and process condition optimization. In particular, the lubricant is a composite of oxidized wax and polyethylene wax in a mass ratio of (0.2-0.6):1. The product has superior comprehensive process performance, a wide processing range, and product processing is not easily affected by fluctuations in production factors, making it easy to achieve large-scale industrial production and popularization and application. Furthermore, the present invention promotes uniform plasticization of PVC, improves its melt strength, and improves product appearance by introducing an acrylic copolymer with a melt flow rate of 2-10g / 10min, and in particular controls the mass ratio of the acrylic copolymer to PVC resin powder to be (0.8-2.5): (75-100).

[0022] Another aspect of the present invention provides a method for preparing a PVC edge banding strip suitable for a soft forming edge banding machine, comprising at least the following steps:

[0023] S1. Stir and mix PVC resin powder, filler, stabilizer, toughening agent, acrylic copolymer and lubricant to obtain pre-plasticized material;

[0024] S2, stirring and cooling the pre-plasticized material to obtain a cooled material;

[0025] S3, extruding the cooled material to obtain a PVC sheet;

[0026] S4. The surface of the PVC sheet is coated with UV varnish, and the bottom of the PVC sheet is coated with glue, and then the sheet is cut into pieces and formed.

[0027] As a preferred technical solution, the stirring and mixing speed in step S1 is 1000-1500 r / min.

[0028] As a preferred technical solution, the temperature of the pre-plasticized material in step S1 is 115°C-125°C.

[0029] As a preferred technical solution, the stirring cooling speed in step S2 is 25-45r / min.

[0030] As a preferred technical solution, the temperature of the cooling material in step S2 is 30°C-45°C.

[0031] As a preferred technical solution, the extrusion equipment in step S3 is a conical twin-screw extruder.

[0032] As a preferred technical solution, the parameters of the conical twin-screw extruder include: the temperature of barrel zone 1 is 150°C-160°C, the temperature of barrel zone 2 is 155°C-165°C, the temperature of barrel zone 3 is 160°C-165°C, and the temperature of barrel zone 4 is 165°C-170°C; the temperature of the confluence core is 160°C-165°C; the temperature of the connecting zone is 170°C-175°C; the temperature of mold zone 1 is 210°C-220°C, the temperature of mold zone 2 is 200°C-210°C, the temperature of mold zone 3 is 190°C-200°C, the temperature of mold zone 4 is 185°C-195°C, the temperature of mold zone 5 is 190°C-200°C, the temperature of mold zone 6 is 200°C-210°C, and the temperature of mold zone 7 is 210°C-220°C; the feeding speed is 10-15r / min; the main engine speed is 25-35r / min.

[0033] As a preferred technical solution, the thickness of the PVC sheet is 0.35-0.75 mm, preferably 0.4-0.6 mm.

[0034] As a preferred technical solution, the coating amount of the UV varnish is 10-18g / m 2 , preferably 10-15g / m 2 .

[0035] As a preferred technical solution, the coating amount of the glue is 18-35g / m 2 , preferably 20-35g / m 2 .

[0036] As a preferred technical solution, the glue is PUR glue (moisture-curing reactive polyurethane hot-melt adhesive).

[0037] Preferably, the PUR adhesive has an adhesive tensile force of ≥100N (test plate with a width of 18mm).

[0038] Beneficial Effects

[0039] 1. The present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine. By optimizing the product formula, the problem that the existing PVC edge banding strips are prone to cracking of varnish and debonding after high-temperature preheating and extrusion bonding in the soft forming edge banding machine, which affects the appearance, is solved. The present invention is suitable for the automated production of soft forming edge banding strips and reduces the product defective rate.

[0040] 2. The present invention adopts PVC resin powder with an average degree of polymerization of 950-1150 and heavy calcium carbonate or light calcium carbonate with a particle size of 1500-2500 mesh, thereby ensuring the processability of the product while meeting the actual processing requirements of subsequent pre-milling, end trimming, drilling, grooving and other processing techniques of the edge banding strips, thereby reducing the product defect rate.

[0041] 3. The present invention effectively improves the toughness of the product by introducing MBS or CPE and controlling the amount of addition. In the subsequent process of extrusion and bonding using a soft forming edge banding machine (processing J-shaped, L-shaped, C-shaped, 45-degree oblique straight edges, arcs, half handles and other unconventional special-shaped panels), it can ensure perfect bonding between the edge banding strip and the panel to avoid the problem of debonding.

[0042] 4. The present invention improves demoulding properties, reduces adhesion of the melt to processing equipment, reduces the generation of production dark lines and coke, reduces shear heat generation during processing, improves melt fluidity, and improves production efficiency by introducing lubricants including oxidized wax and polyethylene wax, in conjunction with process step design and process condition optimization.

[0043] 5. The present invention promotes uniform plasticization of PVC, increases its melt strength and improves product appearance by introducing an acrylic copolymer with a melt flow rate of 2-10 g / 10 min, especially controlling the mass ratio of the acrylic copolymer to PVC resin powder to be (0.8-2.5): (75-100). BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a graph showing the soft forming edge sealing test results of the product provided in Example 1.

[0045] Figure 2 This is a graph showing the soft forming edge banding test results of the product provided in Example 2.

[0046] Figure 3 This is a graph showing the soft forming edge sealing test results of the product provided in Example 3.

[0047] Figure 4 The product temperature resistance test result diagram (left) and soft forming edge sealing test result diagram (right) provided for Example 4.

[0048] Figure 5 This is a graph showing the soft forming edge banding test results of the product provided in Example 5.

[0049] Figure 6 This is a graph showing the soft forming edge sealing test results of the product provided in Example 6.

[0050] Figure 7 This is a diagram of the state where comparative example 1 cannot be extruded.

[0051] Figure 8 The product temperature resistance test result diagram (left) and soft forming edge sealing test result diagram (right) provided for Comparative Example 2.

[0052] Fig. 9 This is a graph showing the soft forming edge banding test results of the product provided for comparative example 3.

[0053] Fig.10 This is the product appearance picture provided for Comparative Example 4.

[0054] Fig.11 This is a graph of the soft formed edge banding test results provided for Comparative Example 5.

[0055] Fig.12 This is a graph of the soft formed edge banding test results provided for Comparative Example 6.

[0056] Fig.13 This is the product appearance picture provided for Comparative Example 7.

[0057] Fig.14 This is the product appearance picture provided for Comparative Example 8. DETAILED DESCRIPTION

[0058] Example 1

[0059] Embodiment 1 of the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine, which comprises the following raw materials, by weight: 75 parts of PVC resin powder, 50 parts of filler, 6 parts of stabilizer, 6 parts of toughening agent, 2.5 parts of acrylic copolymer, and 1.5 parts of lubricant.

[0060] The average polymerization degree of the PVC resin powder is 950-1150, the model is SG-5, and it is from Inner Mongolia Junzheng Energy Chemical Group Co., Ltd.

[0061] The particle size of the filler is 2500 meshes, and the filler is heavy calcium carbonate, model is heavy calcium carbonate YL-2500, Guangdong Yuanlei Powder Co., Ltd.

[0062] The stabilizer is a calcium zinc stabilizer, model number is calcium zinc stabilizer R110R, produced by Baerloch New Material Technology Co., Ltd.

[0063] The toughening agent is methyl methacrylate-butadiene-styrene terpolymer (MBS), model CPE-135A, Guangxi Tiandong Jingui Technology Co., Ltd.

[0064] The melt flow rate of the acrylic copolymer (230° C., 2.16 kg weight) is 8.0 g / 10 min, and the model is P-550A, produced by Mitsubishi Chemical Corporation.

[0065] The lubricant is a combination of oxidized wax and polyethylene wax, and the mass ratio of the oxidized wax to the polyethylene wax is 3:5. The model of the oxidized wax is AC-316A, which is from Honeywell; the model of the polyethylene wax is AC-617A, which is from Honeywell.

[0066] Embodiment 1 of the present invention provides, on the other hand, a method for preparing a PVC edge banding strip suitable for a soft forming edge banding machine, comprising the following steps:

[0067] S1. Stir and mix PVC resin powder, filler, stabilizer, toughening agent, acrylic copolymer and lubricant to obtain pre-plasticized material;

[0068] S2, stirring and cooling the pre-plasticized material to obtain a cooled material;

[0069] S3, extruding the cooled material to obtain a PVC sheet;

[0070] S4. The surface of the PVC sheet is coated with UV varnish, and the bottom of the PVC sheet is coated with glue, and then the sheet is cut into pieces and formed.

[0071] The stirring and mixing speed in step S1 is 1000 r / min.

[0072] The temperature of the pre-plasticized material in step S1 is 115°C.

[0073] The stirring cooling speed in step S2 is 45 r / min.

[0074] The temperature of the cooling material in step S2 is 30°C.

[0075] The extrusion equipment in step S3 is a Φ80 conical twin-screw extruder.

[0076] The parameters of the conical twin-screw extruder include: the temperature of barrel zone 1 is 150°C, the temperature of barrel zone 2 is 155°C, the temperature of barrel zone 3 is 160°C, and the temperature of barrel zone 4 is 165°C; the temperature of confluence core is 160°C; the temperature of connection zone is 170°C; the temperature of mold zone 1 is 210°C, the temperature of mold zone 2 is 200°C, the temperature of mold zone 3 is 190°C, the temperature of mold zone 4 is 185°C, the temperature of mold zone 5 is 190°C, the temperature of mold zone 6 is 200°C, and the temperature of mold zone 7 is 210°C; the feeding speed is 10r / min; the main engine speed is 25r / min.

[0077] The thickness of the PVC sheet is 0.4 mm.

[0078] The coating amount of the UV varnish is 10g / m 2 .

[0079] The coating amount of the glue is 20g / m 2 .

[0080] The glue is PUR glue (moisture curing reactive polyurethane hot melt adhesive), model number is Jiaowang 607.47.

[0081] Example 2

[0082] Embodiment 2 of the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine, which comprises the following raw materials, by weight: 100 parts of PVC resin powder, 15 parts of filler, 3 parts of stabilizer, 3 parts of toughening agent, 0.8 parts of acrylic copolymer, and 0.5 parts of lubricant.

[0083] The average polymerization degree of the PVC resin powder is 950-1150, the model is SG-5, and it is from Inner Mongolia Junzheng Energy Chemical Group Co., Ltd.

[0084] The particle size of the filler is 2000 meshes, and the filler is light calcium carbonate, which comes from Guangdong Yuanlei Powder Co., Ltd.

[0085] The stabilizer is a calcium zinc stabilizer, model number is calcium zinc stabilizer R110R, produced by Baerloch New Material Technology Co., Ltd.

[0086] The toughening agent is chlorinated polyethylene (CPE), model M51, produced by Taiwan Plastics Corporation.

[0087] The melt flow rate of the acrylic copolymer (230° C., 2.16 kg weight) is 8.0 g / 10 min, and the model is P-550A, produced by Mitsubishi Chemical Corporation.

[0088] The lubricant is a combination of oxidized wax and polyethylene wax, and the mass ratio of the oxidized wax to the polyethylene wax is 1:5. The model of the oxidized wax is AC-316A, which is from Honeywell; the model of the polyethylene wax is AC-617A, which is from Honeywell.

[0089] Embodiment 2 of the present invention provides, on the other hand, a method for preparing a PVC edge banding strip suitable for a soft forming edge banding machine, comprising the following steps:

[0090] S1. Stir and mix PVC resin powder, filler, stabilizer, toughening agent, acrylic copolymer and lubricant to obtain pre-plasticized material;

[0091] S2, stirring and cooling the pre-plasticized material to obtain a cooled material;

[0092] S3, extruding the cooled material to obtain a PVC sheet;

[0093] S4. The surface of the PVC sheet is coated with UV varnish, and the bottom of the PVC sheet is coated with glue, and then the sheet is cut into pieces and formed.

[0094] The stirring and mixing speed in step S1 is 1500 r / min.

[0095] The temperature of the pre-plasticized material in step S1 is 125°C.

[0096] The stirring cooling speed in step S2 is 25 r / min.

[0097] The temperature of the cooling material in step S2 is 45°C.

[0098] The extrusion equipment in step S3 is a Φ80 conical twin-screw extruder.

[0099] The parameters of the conical twin-screw extruder include: the temperature of barrel zone 1 is 160°C, the temperature of barrel zone 2 is 165°C, the temperature of barrel zone 3 is 165°C, and the temperature of barrel zone 4 is 170°C; the temperature of confluence core is 165°C; the temperature of connection zone is 175°C; the temperature of mold zone 1 is 220°C, the temperature of mold zone 2 is 210°C, the temperature of mold zone 3 is 200°C, the temperature of mold zone 4 is 195°C, the temperature of mold zone 5 is 200°C, the temperature of mold zone 6 is 210°C, and the temperature of mold zone 7 is 220°C; the feeding speed is 15r / min; and the main engine speed is 35r / min.

[0100] The thickness of the PVC sheet is 0.6 mm.

[0101] The coating amount of the UV varnish is 15g / m 2 .

[0102] The coating amount of the glue is 35g / m 2 .

[0103] The glue is PUR glue (moisture curing reactive polyurethane hot melt adhesive), model number is Jiaowang 607.47.

[0104] Example 3

[0105] Embodiment 3 of the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine and a preparation method thereof. The specific implementation manner is the same as that of Embodiment 1, except that the thickness of the PVC sheet is 0.35 mm.

[0106] Example 4

[0107] Embodiment 4 of the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine and a preparation method thereof. The specific implementation method is the same as that of Embodiment 1, except that the coating amount of the UV varnish is 18 g / m 2 .

[0108] Example 5

[0109] Embodiment 5 of the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine and a preparation method thereof. The specific implementation method is the same as that of Embodiment 2, except that the thickness of the PVC sheet is 0.75 mm.

[0110] Example 6

[0111] Example 6 of the present invention provides a PVC edge banding strip suitable for a soft forming edge banding machine and a preparation method thereof. The specific implementation method is the same as that of Example 2, except that the coating amount of the UV varnish is 18 g / m 2 .

[0112] Comparative Example 1

[0113] Comparative Example 1 of the present invention provides a PVC edge banding strip and a preparation method thereof, and its specific implementation manner is the same as that of Example 1, except that the PVC resin powder is replaced with SG-3, Inner Mongolia Junzheng Energy Chemical Group Co., Ltd.

[0114] Comparative Example 2

[0115] Comparative Example 2 of the present invention provides a PVC edge banding strip and a preparation method thereof, and its specific implementation manner is the same as that of Example 1, except that the PVC resin powder is replaced with SG-7, Inner Mongolia Junzheng Energy Chemical Group Co., Ltd.

[0116] Comparative Example 3

[0117] Comparative Example 3 of the present invention provides a PVC edge banding strip and a preparation method thereof, and its specific implementation method is the same as Example 1, except that the filler is replaced by heavy calcium carbonate with a particle size of 1000 mesh, Guangdong Yuanlei Powder Co., Ltd.

[0118] Comparative Example 4

[0119] Comparative Example 4 of the present invention provides a PVC edge banding strip and a preparation method thereof, and its specific implementation method is the same as Example 1, except that the filler is replaced by heavy calcium carbonate with a particle size of 3500 mesh, Guangdong Yuanlei Powder Co., Ltd.

[0120] Comparative Example 5

[0121] Comparative Example 5 of the present invention provides a PVC edge banding strip and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that the PVC edge banding strip suitable for a soft forming edge banding machine comprises the following raw materials, by weight: 75 parts of PVC resin powder, 50 parts of filler, 6 parts of stabilizer, 2 parts of toughening agent, 2.5 parts of acrylic copolymer, and 1.5 parts of lubricant.

[0122] Comparative Example 6

[0123] Comparative Example 6 of the present invention provides a PVC edge banding strip and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that the PVC edge banding strip suitable for a soft forming edge banding machine comprises the following raw materials, by weight: 75 parts of PVC resin powder, 50 parts of filler, 6 parts of stabilizer, 7 parts of toughening agent, 2.5 parts of acrylic copolymer, and 1.5 parts of lubricant.

[0124] Comparative Example 7

[0125] Comparative Example 7 of the present invention provides a PVC edge banding strip and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that the PVC edge banding strip suitable for a soft forming edge banding machine comprises the following raw materials, by weight: 75 parts of PVC resin powder, 50 parts of filler, 6 parts of stabilizer, 6 parts of toughening agent, 0.5 parts of acrylic copolymer, and 1.5 parts of lubricant.

[0126] Comparative Example 8

[0127] Comparative Example 8 of the present invention provides a PVC edge banding strip and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that the PVC edge banding strip suitable for a soft forming edge banding machine comprises the following raw materials, by weight: 75 parts of PVC resin powder, 50 parts of filler, 6 parts of stabilizer, 6 parts of toughening agent, 4 parts of acrylic copolymer, and 1.5 parts of lubricant.

[0128] Performance Testing

[0129] The products provided in Examples 1-6 and Comparative Examples 2, 3, 5, and 6 were subjected to the following tests (Comparative Examples 1, 4, 7, and 8 were not tested due to product defects). The test results are shown in Tables 1 and Figure 1-14 .

[0130] 1. Vicat softening temperature: GB / T1633-2000 standard B120 method is used, the sample size is 0.5mm×15mm×15mm, 5 pieces are stacked for testing, and the Vicat softening temperature is required to be ≥72℃.

[0131] 2. Glue tensile test: Preparation of test samples: Use 0.5mm×21mm edge banding strips to seal the two long sides of 200mm×100mm×18mm particle board. After edge banding, cure at 25℃ for 48 hours. The test equipment is QC-500N single-column tensile testing machine produced by Shenzhen Qicheng Instrument Equipment Co., Ltd. The average value of the glue tensile force is required to be ≥100N.

[0132] 3. Heat shrinkage: Cut the product into test samples with specifications of 0.5mm×20mm×100mm, and measure the initial length A of the sample. Place it in an oven at 75±2℃ for 60 minutes, take out the sample and cool it at 20±2℃ for 2 hours, and measure the length B of the sample after shrinkage. Shrinkage rate (%) W = (AB) / A×100%, the size measurement is accurate to 0.01mm, and the heat shrinkage requirement is ≤0.3%.

[0133] 4. Heat resistance test: Cut the product into test samples with specifications of 0.5mm×20mm×100mm, place them in an oven at 300±2℃ and bake them for 15min. Take out the samples and cool them at 20±2℃ for 60min. Observe the surface of the edge banding strip. There should be no cracks in the UV varnish layer.

[0134] 5. Soft forming edge banding test: The edge banding strip specification is 0.5mm×50mm. Use ZY-B2(JC)D soft forming edge banding machine (Foshan Chengya CNC Machinery Co., Ltd.). The test board is 18mm thick particle board. The left and right half J, middle half J, full JC, diamond and teardrop-shaped edge banding shapes are tested. The product appearance requires no defects (no wrinkles on the edge, no surface cracks, no debonding at the corners, no shrinkage at both ends, and no chipping at both ends).

[0135] Table 1

[0136]

Claims

1. A PVC edge banding strip suitable for a soft forming edge banding machine, characterized in that: The invention comprises at least the following raw materials by weight: 75-100 parts of PVC resin powder, 15-50 parts of filler, 3-6 parts of stabilizer, 3-6 parts of toughening agent, 0.8-3.5 parts of acrylic copolymer and 0.5-1.5 parts of lubricant.

2. The PVC edge banding strip suitable for a soft forming edge banding machine according to claim 1, characterized in that: The average polymerization degree of the PVC resin powder is 850-1250.

3. The PVC edge banding strip suitable for a soft forming edge banding machine according to claim 2, characterized in that: The particle size of the filler is 1500-2500 mesh.

4. The PVC edge banding strip suitable for a soft forming edge banding machine according to claim 3, characterized in that: The filler is at least one of heavy calcium carbonate and light calcium carbonate.

5. The PVC edge banding strip suitable for a soft forming edge banding machine according to claim 4, characterized in that: The toughening agent is at least one of methyl methacrylate-butadiene-styrene terpolymer and chlorinated polyethylene.

6. The PVC edge banding strip suitable for a soft forming edge banding machine according to claim 5, characterized in that: The mass ratio of the acrylic copolymer to the PVC resin powder is (0.8-2.5):(75-100).

7. The PVC edge banding strip suitable for a soft forming edge banding machine according to claim 6, characterized in that: The lubricant includes at least oxidized wax and polyethylene wax.

8. A method for preparing a PVC edge banding strip suitable for a soft forming edge banding machine according to any one of claims 1 to 7, characterized in that: At least the following steps are included: S1. Stir and mix PVC resin powder, filler, stabilizer, toughening agent, acrylic copolymer and lubricant to obtain pre-plasticized material; S2, stirring and cooling the pre-plasticized material to obtain a cooled material; S3, extruding the cooled material to obtain a PVC sheet; S4. The surface of the PVC sheet is coated with UV varnish, and the bottom of the PVC sheet is coated with glue, and then the sheet is cut into pieces and formed.

9. The method for preparing a PVC edge banding strip suitable for a soft forming edge banding machine according to claim 8, characterized in that: The thickness of the PVC sheet is 0.35-0.75 mm.

10. The method for preparing a PVC edge banding strip suitable for a soft forming edge banding machine according to claim 8, characterized in that: The coating amount of the UV varnish is 10-18g / m 2 The coating amount of the glue is 18-35g / m 2 .

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