Shrink-resistant pvc edge strip, method of making and dimensional stabilizer

Abstract

The application discloses an anti-shrinkage PVC edge strip and a preparation method thereof, and belongs to the field of PVC edge strips. The anti-shrinkage PVC edge strip comprises a size stabilizer, and the size stabilizer comprises nano-silicon dioxide and hollow microbeads. The nano-silicon dioxide can also be modified nano-silicon dioxide, which is obtained by surface grafting of the nano-silicon dioxide with elastomer micro powder, so that the nano-silicon dioxide has good fluidity and lubricity, and can endow the PVC edge strip with excellent toughness. The anti-shrinkage PVC edge strip prepared from the size stabilizer has excellent shape memory and size stability and a low shrinkage rate, is less affected by temperature change and high humidity, and can be widely applied to the edge sealing of furniture and wood, and prevents furniture and boards from delamination.

Description

Technical Field

[0001] This invention relates to the field of PVC edge banding strips, and more particularly to an anti-shrinkage PVC edge banding strip, its preparation method, and a dimensional stabilizer. Background Technology

[0002] Melamine multilayer boards are commonly used to make bathroom furniture. However, in humid environments, they are affected by moisture during use, which can lead to problems such as edge banding peeling and board delamination. In severe cases, this affects the appearance quality and lifespan of the bathroom furniture, greatly limiting the application range of the material.

[0003] Current solutions involve adding a waterproof coating after edge banding or adding paraffin wax inside the board to address the issue of easy breakage. Specific solutions are as follows:

[0004] Option 1: Apply a waterproofing agent to the edge banding area after sealing the melamine board. This method effectively fills the adhesive area during the sealing process, achieving a protective effect. However, in practice, it requires manual application to each edge of the sealing board, which is inefficient; it often affects the appearance of the board and requires high precision in application; moreover, the waterproofing agent is expensive; and the combined cost of labor and materials results in a high overall cost and low efficiency.

[0005] Option 2: Pure paraffin wax is mainly used as a waterproofing material in the production of engineered wood products. In terms of waterproofing principles, it's a physical phenomenon that blocks the gaps between fibers. While this physical barrier improves the waterproofing performance of engineered wood products, it weakens the bond strength between fibers. Therefore, in the production of medium-density fiberboard, hardboard, or particleboard, adding paraffin wax or increasing its dosage often affects other physical and mechanical properties of the product, reducing its bonding strength. Furthermore, the distribution of paraffin wax within the board is often uneven.

[0006] In addition, edge banding strips can be used to seal the cross-section of the board, thereby protecting the board from damage caused by adverse environmental and usage factors and preventing the volatilization of formaldehyde inside the board, while also achieving a decorative and aesthetic effect.

[0007] However, edge banding strips on the market generally suffer from insufficient toughness, stability, and weather resistance, and are greatly affected by temperature and humidity. When used in environments with high temperature and humidity, such as kitchens and bathrooms, their lifespan is relatively short. Summary of the Invention

[0008] The main objective of this invention is to provide an anti-shrinkage PVC edge banding strip, its preparation method, and a dimensional stabilizer, aiming to reduce the shrinkage rate of the edge banding strip and solve the technical problems of poor toughness, stability, and weather resistance of PVC edge banding strips, which are greatly affected by temperature and humidity, and are prone to deformation and subsequent peeling, causing delamination of the board.

[0009] To achieve the above objectives, the present invention provides a size stabilizer comprising nano-silica and hollow microspheres.

[0010] Optionally, the weight ratio of the nano-silica to the hollow microspheres is 2-4:1.

[0011] Optionally, the nano-silica is modified nano-silica, which is obtained by grafting elastomer microparticles onto nano-silica.

[0012] Optionally, the particle size of the elastomer powder is 0.25-1 μm.

[0013] Optionally, the elastomer powder is polyurethane powder.

[0014] In addition, to achieve the above objectives, the present invention also provides an anti-shrinkage PVC edge banding strip, wherein the anti-shrinkage PVC edge banding strip comprises the dimensional stabilizer described above.

[0015] Optionally, the anti-shrinkage PVC edge banding strip further includes the following components: PVC powder, inorganic filler, plasticizer, heat stabilizer, lubricant, coupling agent and dispersant.

[0016] Optionally, the anti-shrinkage PVC edge banding strip comprises the following components by weight: 5-15 parts of dimensional stabilizer, 80-90 parts of PVC powder, 3-5 parts of inorganic filler, 3-5 parts of plasticizer, 2-4 parts of heat stabilizer, 0.5-2 parts of lubricant, 0.2-1 parts of coupling agent, and 3-5 parts of dispersant.

[0017] Further optionally, the anti-shrinkage PVC edge banding strip also includes 0.1-1 parts of antistatic agent and 0.2-1 parts of anti-hydrolysis agent.

[0018] Optionally, the PVC powder is of type SG-1000;

[0019] And / or, the inorganic filler is at least one of calcium carbonate, kaolin, talc, carbon black and quartz powder;

[0020] And / or, the plasticizer is at least one of dioctyl terephthalate, dioctyl adipate, dioctyl sebacate, and methyl chlorostearate;

[0021] And / or, the heat stabilizer is at least one of tribasic lead sulfate, dibasic lead phosphite, dibasic lead stearate, basic lead carbonate, zinc stearate, calcium stearate, and magnesium stearate;

[0022] And / or, the lubricant is one of solid paraffin, liquid paraffin, microcrystalline wax and low molecular weight polyethylene;

[0023] And / or, the coupling agent is chlorinated paraffin;

[0024] And / or, the dispersant is at least one of sodium tripolyphosphate and sodium hexametaphosphate;

[0025] And / or, the antistatic agent is silica;

[0026] And / or, the anti-hydrolysis agent is at least one of carbodiimide, oxazoline compounds, and epoxy compounds.

[0027] Further optionally, the oxazoline compound is 2-oxazoline, and the epoxy compound is 1,4-epoxybutane.

[0028] Furthermore, to achieve the above objectives, the present invention also provides a method for preparing the anti-shrinkage PVC edge banding strip as described above, comprising the following steps:

[0029] S10, mix the size stabilizer and inorganic filler, then add the dispersant and mix evenly, then mix with the remaining raw materials other than the size stabilizer, inorganic filler and dispersant, and disperse evenly to obtain a mixture;

[0030] S20, the mixture is fed into a twin-screw extruder for extrusion granulation to obtain PVC masterbatch;

[0031] S30, the PVC masterbatch is extruded to obtain the anti-shrink PVC edge banding strip.

[0032] The beneficial effects that this invention can achieve are:

[0033] This invention introduces a size stabilizer composed of nano-silica and hollow microspheres into anti-shrinkage PVC edge banding strips. On one hand, nano-silica moderately increases the rigidity of the PVC edge banding strip and effectively improves its stability; on the other hand, hollow microspheres have a high melting point and are not easily decomposed at high temperatures, giving the PVC edge banding strip extremely high thermal stability and improving its flame retardancy and heat distortion temperature. The use of the size stabilizer effectively reduces the shrinkage rate of the PVC edge banding strip, enhances its overall performance, and makes it suitable for various applications, including environments with large temperature variations and high humidity.

[0034] Furthermore, the modified nano-silica obtained by grafting elastomer micropowder onto nano-silica in this invention possesses both the inherent stability of inorganic materials and, due to the addition of elastomers, can further enhance the toughness of PVC edge banding strips. Moreover, the modified nano-silica exhibits good fluidity, lubricity, and dispersibility, making it less prone to agglomeration. When mixed with other raw materials, it can achieve better dispersion, suspension, and stability. When applied to PVC edge banding strips, it makes the PVC edge banding strips moderately rigid and flexible, effectively solving problems such as excessive rigidity of PVC edge banding strips due to excessive inorganic filler content, which easily leads to brittleness, poor durability, and even chipping and damage during edge banding.

[0035] The anti-shrinkage PVC edge banding strip provided by this invention has excellent shape memory and dimensional stability as well as a low shrinkage rate. It is less affected by temperature and humidity, has strong weather resistance, and can be widely used in edge banding of furniture and wood to prevent delamination of furniture and boards. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a schematic flowchart of a method for preparing an anti-shrinkage PVC edge banding strip according to the present invention.

[0038] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0042] Most edge banding strips on the market have problems such as insufficient toughness, stability and weather resistance, and are greatly affected by temperature and humidity. They have a short lifespan when used in environments with high temperature and humidity, such as kitchens and bathrooms.

[0043] In view of this, the present invention provides a size stabilizer comprising nano-silica and hollow microspheres.

[0044] The nano-silica can moderately increase the rigidity of PVC edge banding strips and effectively improve their stability. The hollow microspheres have a high melting point and are not easily decomposed at high temperatures, giving PVC edge banding strips extremely high thermal stability. This improves the flame retardancy and heat distortion temperature of PVC edge banding strips. The dimensional stabilizer obtained by combining the two can effectively reduce the shrinkage rate of PVC edge banding strips, improve their overall performance, and make them applicable to various scenarios, including environments with large temperature variations and high humidity.

[0045] Preferably, the weight ratio of the nano-silica to the hollow microspheres is 2-4:1. Within the above-mentioned preferred weight ratio range, the beneficial effects of the size stabilizer can be maximized.

[0046] Furthermore, in some embodiments, the nano-silica is modified nano-silica, which is obtained by grafting elastomer microparticles onto the surface of nano-silica.

[0047] This invention does not limit the specific preparation method of the modified nano silica, because nano silica contains abundant hydroxyl groups. Preferably, this invention uses ultraviolet irradiation and a free radical copolymerization method to make the hydroxyl groups on the surface of nano silica form free radicals, which then initiate monomer polymerization and graft copolymerization of elastomer micro powder to obtain the modified nano silica of this invention.

[0048] The modified nano-silica of this invention possesses both the inherent stability of inorganic materials and, due to the addition of elastomers, further enhances the toughness of PVC edge banding strips. Moreover, the modified nano-silica exhibits good flowability and lubricity, as well as good dispersibility, and is not prone to agglomeration. When mixed with other raw materials, it achieves better dispersion, suspension, and stability. When applied to PVC edge banding strips, it provides a balanced stiffness and flexibility, effectively solving problems such as excessive rigidity, brittleness, poor durability, and even chipping during edge banding caused by excessive inorganic filler content.

[0049] The present invention does not limit the particle size of the elastomer micro powder, but preferably, the particle size of the elastomer micro powder is 0.25-1μm.

[0050] The present invention does not limit the type of elastomer micro powder. Preferably, the elastomer micro powder is polyurethane micro powder. The polyurethane micro powder has a thermoplastic linear structure and has good stability, chemical resistance, resilience and mechanical properties. When combined with nano-silica and applied to the production of PVC edge banding strips, it can give the product the advantage of moderate rigidity and flexibility.

[0051] The dimension stabilizer of this invention can be applied to the production of PVC edge banding strips to obtain anti-shrinkage PVC edge banding strips. The anti-shrinkage edge banding strips have excellent shape memory and dimensional stability as well as a low shrinkage rate. They are less affected by temperature and humidity, have strong weather resistance, and can be widely used in edge banding of furniture and wood.

[0052] The anti-shrinkage PVC edge banding strip includes, but is not limited to, the dimensional stabilizer, and may also contain other additives. As a preferred embodiment, the anti-shrinkage PVC edge banding strip further includes the following components: PVC powder, inorganic fillers, plasticizers, heat stabilizers, lubricants, coupling agents, and dispersants.

[0053] This invention does not limit the weight proportions of various raw materials in the anti-shrink PVC edge banding. As a preferred embodiment, the anti-shrink PVC edge banding comprises the following components by weight:

[0054] Size stabilizer 5-15 parts,

[0055] 80-90 parts of PVC powder

[0056] 3-5 parts of inorganic filler

[0057] 3-5 parts plasticizer

[0058] 2-4 parts heat stabilizer

[0059] Lubricant 0.5-2 parts,

[0060] 0.2-1 part coupling agent,

[0061] Dispersant 3-5 parts.

[0062] This invention does not limit the type of PVC powder. Preferably, the PVC powder used in this invention is SG-1000.

[0063] The present invention does not limit the type of inorganic filler. Preferably, the inorganic filler is at least one of calcium carbonate, kaolin, talc, carbon black and quartz powder.

[0064] The present invention does not limit the type of plasticizer. Preferably, the plasticizer is at least one selected from dioctyl terephthalate, dioctyl adipate, dioctyl sebacate, and methyl chlorostearate.

[0065] The present invention does not limit the type of heat stabilizer. Preferably, the heat stabilizer is at least one of tribasic lead sulfate, dibasic lead phosphite, dibasic lead stearate, basic lead carbonate, zinc stearate, calcium stearate and magnesium stearate.

[0066] The present invention does not limit the type of lubricant. Specifically, the lubricant is one of solid paraffin, liquid paraffin, microcrystalline wax and low molecular weight polyethylene, etc. Applying at least one of the lubricants described above can effectively reduce the friction between the raw materials and promote fusion.

[0067] In addition, the coupling agent described in this invention is preferably chlorinated paraffin.

[0068] This invention does not limit the type of dispersant. Preferably, the dispersant is selected from at least one of sodium tripolyphosphate and sodium hexametaphosphate. Using at least one dispersant as described above can effectively improve the dispersibility of inorganic fillers and size stabilizers, and prevent them from agglomerating when mixed with other materials, thus facilitating the acquisition of more structurally stable, shrinkage-resistant PVC edge banding strips. Furthermore, it should be noted that the modified nano-silica of this invention has good flowability and lubricity, and can even have a synergistic effect with the dispersant.

[0069] It is understood that the weight and type restrictions on the PVC powder, inorganic filler, plasticizer, heat stabilizer, lubricant, coupling agent, size stabilizer and dispersant mentioned above can be satisfied simultaneously or only one of them. As a preferred embodiment of the present invention, the above restrictions are satisfied simultaneously, which can result in a more uniform and stable anti-shrinkage PVC edge banding strip.

[0070] Furthermore, in some embodiments, the above-mentioned anti-shrinkage PVC edge banding strip further includes 0.1-1 parts of antistatic agent and 0.2-1 parts of anti-hydrolysis agent by weight.

[0071] The antistatic agent can further optimize the physical and chemical properties of PVC edge banding strips, giving them antistatic properties. It not only has excellent electrical insulation properties, but also has the advantages of high temperature resistance, non-flammability, and being odorless and tasteless, making it suitable for use in environments where static electricity is easily generated.

[0072] This invention adds an antistatic agent to the raw materials, enabling the PVC edge banding strip to carry antistatic properties itself. Compared with spraying antistatic agents onto the product surface by coating, the antistatic effect is more durable.

[0073] The present invention does not limit the type of antistatic agent, but preferably, the antistatic agent is silica.

[0074] The anti-hydrolysis agent can optimize the hydrolysis resistance of PVC edge banding strips. Similarly, this invention does not limit the type of anti-hydrolysis agent. Preferably, the anti-hydrolysis agent is at least one of carbodiimide, oxazoline compounds, and epoxy compounds. More preferably, the oxazoline compound is 2-oxazoline, and the epoxy compound is 1,4-epoxybutane.

[0075] This invention also proposes a method for preparing the anti-shrinkage PVC edge banding strip as described above, referring to... Figure 1 , Figure 1 This is a flowchart of a method for preparing an anti-shrinkage PVC edge banding strip according to the present invention, which includes the following steps:

[0076] S10, mix the size stabilizer and inorganic filler, then add the dispersant and mix evenly, then mix with the remaining raw materials other than the size stabilizer, inorganic filler and dispersant, and disperse evenly to obtain a mixture.

[0077] The size stabilizer contains hollow microspheres and nano-silica. The inorganic filler is at least one of calcium carbonate, kaolin, talc, carbon black, and quartz powder. Both the filler and nano-silica have inorganic properties and good compatibility. Pre-mixing them with the aid of a dispersant can help obtain a more uniform and stable system, preventing particle sedimentation and agglomeration in subsequent material mixing.

[0078] Similarly, the modified nano-silica possesses properties similar to nano-silica. Pre-mixing it with the inorganic filler achieves the same beneficial effects as described above. Furthermore, the modified nano-silica also exhibits good flowability and lubricity. Pre-mixing the two yields a well-dispersed mixture, which also improves the dispersibility of the inorganic filler. Adding a dispersant at this point further enhances the dispersibility and compatibility of the inorganic filler, preventing agglomeration and particle sedimentation and aggregation during subsequent material mixing, thus contributing to a more uniform and stable system.

[0079] In addition, because the modified nano-silica of this invention has good fluidity and lubricity, and its own dispersibility is good, the use of dispersant can even be appropriately reduced.

[0080] Preferably, the present invention first mixes the size stabilizer, inorganic filler and dispersant evenly by stirring, with the stirring speed preferably being 1500-2500 rpm, and then mixes them with the remaining raw materials, preferably at a speed of 2000-3000 rpm, and obtains a mixture by stirring and dispersing evenly.

[0081] S20: The mixture from S10 is fed into a twin-screw extruder for extrusion granulation to obtain PVC masterbatch. In this step, the extrusion granulation temperature is preferably 140-180℃. Within this temperature range, the components are well integrated, making it easy to obtain stable and uniform PVC masterbatch.

[0082] S30, the PVC masterbatch is extruded to obtain the anti-shrink PVC edge banding strip.

[0083] In this step, the extrusion molding temperature is preferably 120-170℃.

[0084] The present invention first mixes and extrudes the components into PVC masterbatch, and then extrudes the PVC masterbatch into a molding process, which can obtain a more uniform and stable anti-shrinkage PVC edge banding strip.

[0085] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0086] Example 1

[0087] Reference Figure 1 , Figure 1 This is a schematic flowchart of the first embodiment of the preparation method of the anti-shrinkage PVC edge banding strip of the present invention.

[0088] In this embodiment, the preparation method of the anti-shrinkage PVC edge banding strip includes the following steps:

[0089] S10, by weight, 9 parts of modified nano-silica, 3 parts of hollow microspheres, 2 parts of inorganic filler calcium carbonate, 1 part of inorganic filler kaolin, and 3 parts of dispersant sodium tripolyphosphate are mixed and stirred evenly at 1500 rpm. Then, it is mixed with 80 parts of SG-1000 PVC powder, 3 parts of dioctyl terephthalate, 3 parts of tribasic lead sulfate, 1 part of solid paraffin, 0.5 parts of liquid paraffin, and 0.2 parts of chlorinated paraffin and stirred evenly at 2000 rpm to obtain a mixture.

[0090] S20 is obtained by feeding the mixture of S10 into a twin-screw extruder and extruding and granulating it at 150°C to obtain PVC masterbatch.

[0091] S30 is obtained by extruding the PVC masterbatch of S20 at 160°C to obtain an anti-shrink PVC edge banding.

[0092] Example 2

[0093] Reference Figure 1 , Figure 1 This is a schematic flowchart of the second embodiment of the preparation method of the anti-shrink PVC edge banding strip of the present invention.

[0094] In this embodiment, the preparation method of the anti-shrinkage PVC edge banding strip includes the following steps:

[0095] S10: Mix 10 parts modified nano-silica, 5 parts hollow microspheres, 5 parts carbon black, and 4 parts dispersant sodium tripolyphosphate. Stir evenly at 2000 rpm. Then, mix with 85 parts SG-1000 PVC powder, 2 parts dioctyl adipate, 2 parts methyl chlorostearate, 1 part zinc stearate, 1 part calcium stearate, 1 part magnesium stearate, 0.5 parts microcrystalline wax, 0.2 parts chlorinated paraffin, 0.5 parts silica, and 0.5 parts carbodiimide. Stir evenly at 3000 rpm to obtain a mixture.

[0096] S20 is obtained by feeding the mixture of S10 into a twin-screw extruder and extruding and granulating it at 180°C to obtain PVC masterbatch.

[0097] S30 is obtained by extruding the PVC masterbatch of S20 at 170°C to obtain an anti-shrink PVC edge banding.

[0098] Example 3

[0099] Reference Figure 1 , Figure 1 This is a schematic flowchart of the third embodiment of the preparation method of the anti-shrink PVC edge banding strip of the present invention.

[0100] In this embodiment, the preparation method of the anti-shrinkage PVC edge banding strip includes the following steps:

[0101] S10: Mix 4 parts modified nano silica, 1 part hollow microspheres, 3 parts quartz powder, 1 part talc powder, and 5 parts dispersant sodium hexametaphosphate. Stir evenly at 1500 rpm. Then mix with 90 parts SG-1000 PVC powder, 5 parts dioctyl terephthalate, 4 parts dibasic lead phosphite, 2 parts solid paraffin, 0.5 parts chlorinated paraffin, and 0.2 parts 2-oxazoline. Stir evenly at 3000 rpm to obtain a mixture.

[0102] S20 is a mixture of S10 and S20. The mixture is fed into a twin-screw extruder and extruded and granulated at 140°C to obtain PVC masterbatch.

[0103] S30 is obtained by extruding the PVC masterbatch of S20 at 120°C to obtain an anti-shrink PVC edge banding.

[0104] Example 4

[0105] Reference Figure 1 , Figure 1 This is a schematic flowchart of the fourth embodiment of the preparation method of an anti-shrinkage PVC edge banding strip according to the present invention.

[0106] In this embodiment, the preparation method of the anti-shrinkage PVC edge banding strip includes the following steps:

[0107] S10: Mix 6 parts modified nano-silica, 3 parts hollow microspheres, 5 parts calcium carbonate, and 3 parts sodium tripolyphosphate dispersant, and stir evenly at 2500 rpm. Then mix with 80 parts SG-1000 PVC powder, 1 part dioctyl sebacate, 2 parts dioctyl terephthalate, 1 part dibasic lead stearate, 1 part basic lead carbonate, 1 part low molecular weight polyethylene, 1 part solid paraffin, 0.8 parts chlorinated paraffin, 0.1 parts silica, and 1 part 1,4-epoxybutane, and stir evenly at 2000 rpm to obtain a mixture.

[0108] S20 is obtained by feeding the mixture of S10 into a twin-screw extruder and extruding and granulating it at 150°C to obtain PVC masterbatch.

[0109] S30 is obtained by extruding the PVC masterbatch of S20 at 160°C to obtain an anti-shrink PVC edge banding.

[0110] Example 5

[0111] Reference Figure 1 , Figure 1 This is a schematic flowchart of the fifth embodiment of the preparation method of an anti-shrinkage PVC edge banding strip according to the present invention.

[0112] S10: Mix 4 parts modified nano silica, 2 parts hollow microspheres, 3 parts quartz powder, 1 part sodium tripolyphosphate dispersant, and 3 parts sodium tripolyphosphate dispersant. Stir evenly at 2000 rpm. Then mix with 90 parts SG-1000 PVC powder, 4 parts dioctyl adipate, 2 parts dibasic lead phosphite, 2 parts liquid paraffin, 1 part chlorinated paraffin, 1 part silica, 0.5 parts carbodiimide, and 0.5 parts 2-oxazoline. Stir evenly at 2500 rpm to obtain a mixture.

[0113] S20 is a mixture of S10 and S20. The mixture is fed into a twin-screw extruder and extruded and granulated at 160°C to obtain PVC masterbatch.

[0114] S30 is obtained by extruding the PVC masterbatch of S20 at 150°C to obtain an anti-shrink PVC edge banding.

[0115] Example 6

[0116] Example 6 is prepared in the same way as Example 1, except that nano-silica is used instead of the modified nano-silica.

[0117] Comparative Example 1

[0118] Comparative Example 1 was prepared using the same method as Example 1, except that no size stabilizer was used.

[0119] Comparative Example 2

[0120] Comparative Example 2 was prepared using the same method as Example 1, except that the size stabilizer did not contain hollow microspheres and was replaced with an equal weight of modified nano-silica.

[0121] Comparative Example 3

[0122] Comparative Example 3 was prepared using the same method as Example 1, except that the size stabilizer did not contain modified nano-silica and was replaced with an equal weight of hollow microspheres.

[0123] Comparative Example 4

[0124] Comparative Example 4 was prepared using the same method as Example 1, except that the size stabilizer consisted of 3 parts modified nano-silica and 9 parts hollow microspheres.

[0125] Comparative Example 5

[0126] Comparative Example 5 was prepared in the same way as Example 1, except that the heat stabilizer tribasic lead sulfate was prepared in 6 parts by weight.

[0127] Comparative Example 6

[0128] Comparative Example 6 was prepared using the same method as Example 1, except that no dispersant was added.

[0129] Performance testing

[0130] The performance of the products obtained in Examples 1-6 and Comparative Examples 1-6 was measured, and the results are shown in Table 1.

[0131] Table 1. Performance comparison of the products obtained in Examples 1-5 and Comparative Examples 1-6

[0132]

[0133] As shown in Table 1:

[0134] The anti-shrinkage PVC edge banding strips of Examples 1 to 6 all have good tensile strength, notched impact strength and elongation at break, and have low shrinkage rate and dimensional change rate when placed in still water at room temperature.

[0135] As can be seen from the comparison between Example 1 and Example 6, the anti-shrinkage PVC edge banding prepared by using a size stabilizer composed of nano-silica and hollow microspheres has better tensile strength, toughness and anti-shrinkage effect. In Example 1, the modified nano-silica was used to replace nano-silica, which further improved the performance of the anti-shrinkage PVC edge banding in all aspects and gave it better comprehensive performance.

[0136] As can be seen from the comparison between Example 1 and Comparative Example 1, the dimensional stabilizer used in this invention can significantly improve the tensile strength, elongation at break, and notched impact strength of PVC edge banding strips, reduce the shrinkage rate of PVC edge banding strips, improve the dimensional stability of PVC edge banding strips, reduce the dimensional change rate, and effectively improve their strength, toughness, and anti-shrinkage effect.

[0137] As shown in Comparative Example 2, the dimensional stabilizer only contains modified nano-silica. Although the shrinkage rate is acceptable, the tensile strength and elongation at break of the PVC edge banding are not ideal, only 18.9 MPa and 487%, respectively. The notched impact strength and the dimensional change rate after standing in water at room temperature also show a significant decrease.

[0138] As shown in Comparative Example 3, the dimension stabilizer contains only hollow microspheres, which significantly worsens the tensile strength and shrinkage rate of the edge banding, thus hindering the improvement of the toughness or strength of the PVC edge banding.

[0139] As shown in Comparative Example 4, the component ratio of the size stabilizer is one of the important factors affecting the performance of PVC edge banding strips.

[0140] As unexpectedly observed in ratio 5, excessive addition of heat stabilizer did not significantly improve the performance of PVC edge banding strips; in fact, its overall performance decreased.

[0141] As can be seen from the comparison between Example 1 and Comparative Example 6, dispersant is an important component in the preparation of anti-shrink PVC edge banding strips. It directly affects the degree of mixing and dispersion of dimensional stabilizer and inorganic filler, and thus affects the degree of mixing uniformity among all raw materials. By adjusting the dispersant, the beneficial effects of dimensional stabilizer can be better exerted, and the strength, toughness and anti-shrink performance of anti-shrink PVC edge banding strips can be improved.

[0142] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A shrinkage-resistant PVC edge banding strip, characterized in that, The anti-shrinkage PVC edge banding strip contains a size stabilizer, which includes nano-silica and hollow microspheres; The weight ratio of the nano-silica to the hollow microspheres is 2-4:1; The anti-shrinkage PVC edge banding strip comprises the following components by weight: 5-15 parts of dimensional stabilizer, 80-90 parts of PVC powder, 3-5 parts of inorganic filler, 3-5 parts of plasticizer, 2-4 parts of heat stabilizer, 0.5-2 parts of lubricant, 0.2-1 parts of coupling agent, and 3-5 parts of dispersant.

2. The anti-shrinkage PVC edge banding strip as described in claim 1, characterized in that, The nano-silica is modified nano-silica, which is obtained by grafting elastomer microparticles onto nano-silica.

3. The anti-shrinkage PVC edge banding strip as described in claim 2, characterized in that, The particle size of the elastomer micropowder is 0.25-1 μm; and / or, the elastomer micropowder is polyurethane micropowder.

4. The anti-shrinkage PVC edge banding strip as described in claim 1, characterized in that, By weight, the anti-shrinkage PVC edge banding also includes 0.1-1 parts of antistatic agent and 0.2-1 parts of anti-hydrolysis agent.

5. The anti-shrinkage PVC edge banding strip as described in claim 4, characterized in that, The PVC powder is of type SG-1000; And / or, the inorganic filler is at least one of calcium carbonate, kaolin, talc, carbon black and quartz powder; And / or, the plasticizer is at least one of dioctyl terephthalate, dioctyl adipate, dioctyl sebacate, and methyl chlorostearate; And / or, the heat stabilizer is at least one of tribasic lead sulfate, dibasic lead phosphite, dibasic lead stearate, basic lead carbonate, zinc stearate, calcium stearate, and magnesium stearate; And / or, the lubricant is one of solid paraffin, liquid paraffin, microcrystalline wax and low molecular weight polyethylene; And / or, the coupling agent is chlorinated paraffin; And / or, the dispersant is at least one of sodium tripolyphosphate and sodium hexametaphosphate; And / or, the antistatic agent is silica; And / or, the anti-hydrolysis agent is at least one of carbodiimide, oxazoline compounds, and epoxy compounds.

6. A method for preparing an anti-shrinkage PVC edge banding strip as described in any one of claims 1 to 5, characterized in that, Includes the following steps: The size stabilizer and inorganic filler are mixed, then a dispersant is added and mixed evenly. Then, the mixture is mixed with the remaining raw materials other than the size stabilizer, inorganic filler and dispersant, and dispersed evenly to obtain a mixture. The mixture is fed into a twin-screw extruder for extrusion granulation to obtain PVC masterbatch; The PVC masterbatch is extruded to obtain shrink-resistant PVC edge banding.

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