TPO (thermoplastic polyolefin) film-coated plate and preparation method thereof

Abstract

The invention relates to the technical field of film-coated plates, and particularly discloses a TPO film-coated plate and a preparation method thereof. The TPO film-coated plate sequentially comprises a base material plate, a bonding layer and a TPO layer from bottom to top, and the TPO layer is prepared from the following raw materials in parts by weight: 40-50 parts of TPO resin; 10 to 15 parts of ethylene propylene diene monomer rubber; 15 to 25 parts of polypropylene; 1-3 parts of a cross-linking agent; 0.5 to 1 part of an antioxidant; 0.5-1 part of a light stabilizer; 0.4 to 0.8 part of calcined kaolin; 0.6 to 1.2 parts of calcined diatomite; and 2-4 parts of modified slag fiber. The preparation method comprises the following steps: banburying and extruding raw materials required for preparing the TPO layer to obtain the TPO layer; one side of the bonding layer and the TPO layer are firstly preheated and compounded, and then the base material plate and the other side of the bonding layer are subjected to hot-pressing compounding. According to the application, tiny bubbles at the interface bonding part of the TPO layer and the bonding layer during application can be remarkably reduced, so that the bonding stability of the TPO layer and the bonding layer is remarkably improved, and the TPO laminated plate with excellent application stability is finally obtained.

Description

Technical Field

[0001] This application relates to the technical field of coated boards, and more specifically, it relates to a TPO coated board and its preparation method. Background Art

[0002] ‌A coated board is a composite board with a layer of film laminated on the surface of a substrate. By covering one or more functional films on the surface of the substrate, purposes such as protection, decoration, and strengthening are achieved, and it has excellent durability, decorative properties, and processing performance. At the same time, the coated board not only has the strength and processing performance of the substrate but also has the decorative properties, corrosion resistance, weather resistance, pollution resistance, etc. of the polymer film, and is widely used in fields such as building decoration, household appliances, and transportation.‌ TPO is the abbreviation of thermoplastic polyolefin elastomer, which is an elastomeric material composed of two components, rubber and polyolefin. The main raw materials of TPO materials include ethylene propylene diene monomer (EPDM), polyethylene (PE), polypropylene (PP), or polyolefin POE, etc. It can be blended from EPDM and PP, or can be blended from multiple materials such as EPDM, PP, and PE. TPO materials show high elasticity of rubber at room temperature and can be plasticized and formed at high temperatures, which makes it widely used in many fields. And the TPO coated board uses the TPO material as the film on the surface of the substrate and has excellent waterproof, corrosion prevention, and anti-deformation capabilities during application.

[0003] For example, the invention patent with the patent authorization number CN118342864B discloses a TPO coated board and its preparation method. The TPO coated board includes a metal plate, an adhesive layer, and a TPO waterproof layer from bottom to top in sequence. The adhesive layer includes the following raw materials: phenolic resin, triphenylmethane triisocyanate, silane-modified polyester, polyolefin adhesive, and maleic anhydride-grafted POE. The silane-modified polyester is obtained by polymerizing a silane monomer, vinyl versatate, and vinyl benzoate. Its preparation method includes the following steps: preheat and laminate one side of the adhesive layer and the TPO waterproof layer at 120 - 140 °C first, and then hot-press and laminate the metal plate and the other side of the adhesive layer at 140 - 160 °C to obtain a TPO coated board with a metal plate, an adhesive layer, and a TPO waterproof structure from bottom to top in sequence.

[0004] Regarding the related technologies described above, the inventor believes that the interfacial tension between the TPO material and the substrate is usually large, and the adhesion is often insufficient. Therefore, an adhesive material needs to be used to improve the bonding between the TPO material and the substrate. However, both the adhesive material and the TPO material have relatively poor air permeability. When materials with good air permeability are combined or a material with poor air permeability is combined with a material with good air permeability, it is not easy to generate bubbles. If the air permeability of both materials is relatively poor, bubbles are likely to be generated when they are combined. Based on the above situation, when the adhesive material and the TPO material are combined, a large number of tiny bubbles are likely to be generated, and the existence of these tiny bubbles often makes the interfacial bonding stability between the adhesive material and the TPO material unable to meet the expectations, resulting in poor overall performance.

[0005] Therefore, there is an urgent need to propose a solution to solve the above technical problems. Summary of the Invention

[0006] In order to reduce the tiny bubbles generated when the adhesive material and the TPO material are combined and improve the interfacial bonding stability between them, the present application provides a TPO coated board and a preparation method thereof.

[0007] In a first aspect, the present application provides a TPO coated board, adopting the following technical solution: A TPO coated board includes a substrate board, an adhesive layer, and a TPO layer from bottom to top in sequence. The TPO layer is made of raw materials including the following parts by weight: TPO resin: 40 - 50 parts; Ethylene propylene diene monomer rubber: 10 - 15 parts; Polypropylene: 15 - 25 parts; Crosslinking agent: 1 - 3 parts; Antioxidant: 0.5 - 1 part; Light stabilizer: 0.5 - 1 part; Calcined kaolin: 0.4 - 0.8 part; Calcined diatomite: 0.6 - 1.2 parts; Modified slag fiber: 2 - 4 parts; The modified slag fiber is obtained through the following steps: S1. Mix the slag fiber raw material with deionized water, perform dispersion stirring, and after standing, take the upper-layer fiber for drying to obtain the washed slag fiber; S2. Immerse the washed slag fiber in a sodium hydroxide solution for treatment, wash and dry it to obtain the pretreated slag fiber; S3. Place the pretreated slag fiber and the paraffin raw material in a closed container, perform vacuum pumping, then remove the vacuum and let it stand, and finally obtain the modified slag fiber after drying.

[0008] By adopting the above technical solutions, the surface and internal network pores of slag fibers determine their porous characteristics. During the process of treating slag fiber raw materials, non-fiber impurity slag balls in the slag fiber raw materials can be removed through the operation of step S1; through the operation of step S2, the specific surface area of the slag fibers is increased; and then through the operation of step S3, the air in the pores of the pretreated slag fibers is discharged, and paraffin can enter the pores and be firmly adsorbed by the pretreated slag fibers, thereby obtaining modified slag fibers. When the modified slag fibers are applied to the TPO layer, on the one hand, a large number of voids can be formed by the interlacing of the fibers, which can enhance the air permeability of the TPO layer; on the other hand, during the hot pressing and compounding process of the TPO layer, paraffin can fill the tiny air bubbles at the interface between the bonding layer and the TPO layer; at the same time, during the preparation of the TPO layer, the paraffin in the pores of the modified slag fibers flows out, and the flowing paraffin can improve the processing performance of the TPO layer, and the pores of the modified slag fibers in the vacant state at this time can significantly improve the air permeability of the TPO layer; thus, by applying the modified slag fibers, the tiny air bubbles during the lamination of the bonding layer and the TPO layer can be reduced, and the interfacial bonding stability between the two can be improved. Calcined kaolin and calcined diatomite are obtained by calcining kaolin raw materials and diatomite raw materials respectively. It is easy to form conveying voids between their particles, and the number of its own micropores increases, and the pore diameter becomes larger, which can well improve the air permeability of the TPO layer. Among the preparation raw materials of the above TPO layer, through the combined use of calcined kaolin, calcined diatomite and modified slag fibers, a multi-level and three-dimensional air-permeable structure can be formed among the three, and then an excellent compound synergistic effect can be exerted, so that the air permeability of the TPO layer is significantly improved, and the tiny air bubbles at the interface between the TPO layer and the bonding layer during application can be significantly reduced, and the bonding stability is significantly improved. The finally obtained TPO coated board also has excellent application stability.

[0009] Preferably, step S2 is specifically set as: impregnating the washed slag fibers with a sodium hydroxide solution at a solid-liquid ratio of 1:(25 - 30) for 30 - 50 min, the concentration of the sodium hydroxide solution is 3 - 4 mol / L, and after washing and drying, pretreated slag fibers are obtained.

[0010] By adopting the above technical solutions, in the operation of step S2, the alkali metals in the slag fibers can be precipitated, and the surface roughness of the pretreated slag fibers is relatively good, the specific surface area is also relatively large, and the accommodation and adsorption capacity of its own pores for the subsequent used paraffin are also relatively excellent. Furthermore, the corresponding effects brought by the application of the finally obtained modified slag fibers are relatively prominent, and a TPO coated board with relatively outstanding quality can be obtained.

[0011] Preferably, step S3 is specifically set as follows: placing the pretreated slag fiber and paraffin raw materials in a closed container at a mass ratio of 1:(2 - 4), performing vacuum treatment for 0.5 - 1.5 h, then removing the vacuum and leaving it for 5 - 8 h, and finally obtaining the modified slag fiber after drying.

[0012] By adopting the above technical solution, in the operation of step S3, the air in the pores of the pretreated slag fiber can be completely discharged, and the paraffin can also enter more thoroughly. As a result, the obtained modified slag fiber can exhibit better application effects during use, and finally the overall quality of the TPO coated board is also better.

[0013] Preferably, the average diameter of the slag fiber raw material is 3 - 5 μm, and the average length is 5 - 7 mm; The particle size of the calcined kaolin is 30 - 50 μm; The particle size of the calcined diatomite is 20 - 40 μm.

[0014] By adopting the above technical solution, after the slag fiber raw material of the above specifications is used to prepare the modified slag fiber, it can exhibit a relatively excellent compound synergistic effect with the calcined kaolin and calcined diatomite of the above specifications. The multi-level and three-dimensional breathable structure formed among the three in the TPO layer is also relatively uniform, and the breathability exhibited by the TPO layer is also better. As a result, the tiny bubbles at the interface between the TPO layer and the adhesive layer are significantly reduced, and the adhesive stability exhibited is relatively excellent.

[0015] Preferably, the weight ratio of the calcined kaolin, calcined diatomite, and modified slag fiber is 4:6:28.

[0016] By adopting the above technical solution, when the calcined kaolin, calcined diatomite, and modified slag fiber of the above weight ratio are combined, the corresponding effects brought by the structural system formed among them in the TPO layer are relatively excellent, which can significantly improve the breathability of the TPO layer. As a result, the tiny bubbles at the interface between the TPO layer and the adhesive layer are significantly reduced, and a TPO coated board with better quality is obtained.

[0017] Preferably, the calcined kaolin is obtained by subjecting the kaolin raw material to isothermal calcination at 800 - 900 °C for 5 - 6 h; The calcined diatomite is obtained by subjecting the diatomite raw material to isothermal calcination at 650 - 750 °C for 5 - 6 h.

[0018] By adopting the above technical solution, the calcined kaolin and calcined diatomite obtained under the above calcination conditions exhibit relatively stable and excellent corresponding effects when applied in the TPO layer, and have an excellent effect on improving the breathability of the TPO layer, and finally a TPO coated board with better quality can be obtained.

[0019] Preferably, the crosslinking agent is an organic peroxide crosslinking agent.

[0020] By adopting the above technical solution, the organic peroxide crosslinking agent decomposes to generate free radicals at an appropriate temperature, and these free radicals further initiate the crosslinking reaction of the polymer chains, ultimately forming a stable crosslinked network, which can play an excellent and stable role in the TPO layer. It not only promotes the crosslinking of polymer chains to form a stable three-dimensional network structure, but also can improve the thermal stability, mechanical properties and aging resistance of the TPO layer.

[0021] Preferably, the antioxidant is a composition of one or more of hindered phenol antioxidants, phosphite antioxidants, thioether antioxidants and amine antioxidants.

[0022] By adopting the above technical solution, the main functions of the antioxidant in the TPO layer mainly include delaying material aging, improving weather resistance and maintaining appearance quality, and the above types of antioxidants are all suitable for the preparation of the TPO layer and can play excellent and stable corresponding effects.

[0023] Preferably, the light stabilizer is a composition of one or more of hindered amine light stabilizers, ultraviolet light absorbers, quenchers and light shielding agents.

[0024] By adopting the above technical solution, the main functions of the light stabilizer in the TPO layer mainly include improving weather resistance, extending service life and enhancing material properties, and the above types of light stabilizers are all suitable for the preparation of the TPO layer and can play excellent and stable corresponding effects.

[0025] In the second aspect, the present application provides a method for preparing a TPO coated board, adopting the following technical solution: A method for preparing a TPO coated board includes the following steps: (1) Prepare raw materials including TPO resin, ethylene propylene diene monomer rubber, polypropylene, crosslinking agent, antioxidant, light stabilizer, calcined kaolin, calcined diatomite and modified slag fiber according to the ratio; (2) Mix and knead the TPO resin, ethylene propylene diene monomer rubber, polypropylene, crosslinking agent, calcined kaolin, calcined diatomite and modified slag fiber in step (1), then add the antioxidant and light stabilizer, continue kneading, and after completion, extrude to obtain the TPO layer; (3) First preheat and compound one side of the adhesive layer and the TPO layer, and then hot press and compound the substrate board with the other side of the adhesive layer to prepare a TPO coated board with the substrate board, adhesive layer and TPO layer from bottom to top in sequence.

[0026] By adopting the above technical solutions, the above method is simple to operate. Each raw material in the TPO layer can be fully coordinated and play an excellent effect, so as to obtain a TPO layer with excellent quality. Moreover, when the TPO layer, the adhesive layer and the TPO layer are compounded, the overall operation is also relatively convenient, and it can ensure that the three can be stably combined, so as to obtain a TPO coated board with better quality, and the whole is also suitable for large-scale industrial production.

[0027] In summary, the present application has the following beneficial effects: The present application uses modified slag fibers prepared by special modification, and combines the modified slag fibers with calcined kaolin and calcined diatomaceous earth for use in the TPO layer, which can significantly improve the air permeability of the TPO layer, and then significantly reduce the micro-bubbles at the interface between the TPO layer and the adhesive layer during application, so that the bonding stability between the TPO layer and the adhesive layer is significantly improved, and finally a TPO coated board with excellent application stability is obtained. Specific Embodiments

[0028] The present application will be further described in detail below with reference to Preparation Examples, Examples and Comparative Examples.

[0029] Except as otherwise specified, the raw materials used in each Preparation Example, Example and Comparative Example of the present application are all commercially available: The base plate is purchased as a 316H stainless steel plate; The adhesive layer is purchased as EVOH DuPont OH 4416 extrusion grade from the United States; The TPO resin is purchased as ExxonMobil Exxtral BNT013 from the United States; The ethylene propylene diene monomer rubber is purchased as Eni EPDM 4047; The polypropylene is purchased as R370Y from SK of South Korea; The slag fiber raw material is purchased from Shijiazhuang Leihong Technology Co., Ltd.; The organic peroxide crosslinking agent is purchased as Trigonox 29-C90 from Nouryon; The hindered phenol antioxidant is purchased as antioxidant 1010; The ultraviolet light absorber is purchased as BASF Chimassorb 81.

[0030] Preparation Examples of Raw Materials and / or Intermediates Preparation Example 1 A kind of modified slag fiber is obtained by the following steps: S1. After mixing the slag fiber raw material with deionized water, carry out dispersion stirring, and take the upper-layer fiber for drying after standing to obtain the washed slag fiber; S2. Immerse the washed slag fiber in a sodium hydroxide solution at a solid-liquid ratio of 1:27.5 for 40 min. The concentration of the sodium hydroxide solution is 3.5 mol / L. After washing and drying, the pretreated slag fiber is obtained. S3. Place the pretreated slag fiber and the paraffin raw material in a closed container at a mass ratio of 1:3, conduct a vacuum treatment for 1 h, then relieve the vacuum and leave it for 6.5 h. Finally, the modified slag fiber is obtained after drying.

[0031] Note: The average diameter of the above slag fiber raw material is 4 μm, and the average length is 6 mm; the paraffin raw material is composed of solid paraffin and liquid paraffin at a weight ratio of 4:6.

[0032] Preparation Example 2 A modified slag fiber, different from Preparation Example 1 in that step S2 is specifically set as: Immerse the washed slag fiber in a sodium hydroxide solution at a solid-liquid ratio of 1:25 for 30 min. The concentration of the sodium hydroxide solution is 3 mol / L. After washing and drying, the pretreated slag fiber is obtained.

[0033] Preparation Example 3 A modified slag fiber, different from Preparation Example 1 in that step S2 is specifically set as: Immerse the washed slag fiber in a sodium hydroxide solution at a solid-liquid ratio of 1:30 for 50 min. The concentration of the sodium hydroxide solution is 4 mol / L. After washing and drying, the pretreated slag fiber is obtained.

[0034] Preparation Example 4 A modified slag fiber, different from Preparation Example 1 in that step S3 is specifically set as: Place the pretreated slag fiber and the paraffin raw material in a closed container at a mass ratio of 1:2, conduct a vacuum treatment for 0.5 h, then relieve the vacuum and leave it for 5 h. Finally, the modified slag fiber is obtained after drying.

[0035] Preparation Example 5 A modified slag fiber, different from Preparation Example 1 in that step S3 is specifically set as: Place the pretreated slag fiber and the paraffin raw material in a closed container at a mass ratio of 1:4, conduct a vacuum treatment for 1.5 h, then relieve the vacuum and leave it for 8 h. Finally, the modified slag fiber is obtained after drying.

[0036] Preparation Example 6 A modified slag fiber, different from Preparation Example 1 in that the average diameter of the above slag fiber raw material is 3 μm and the average length is 5 mm.

[0037] Preparation Example 7 A modified slag fiber, different from Preparation Example 1 in that the average diameter of the above slag fiber raw material is 5 μm and the average length is 7 mm.

[0038] Example Example 1 A TPO-coated board, which sequentially includes a base board, an adhesive layer, and a TPO layer from bottom to top. The raw materials for preparing the TPO layer and their corresponding weights are shown in Table 1, and the TPO-coated board is obtained through the following steps: (1) Prepare raw materials containing TPO resin, ethylene propylene diene monomer rubber, polypropylene, crosslinking agent, antioxidant, light stabilizer, calcined kaolin, calcined diatomaceous earth, and modified slag fiber according to the ratio; (2) After mixing and kneading the TPO resin, ethylene propylene diene monomer rubber, polypropylene, crosslinking agent, calcined kaolin, calcined diatomaceous earth, and modified slag fiber in step (1) at 160°C for 30 minutes, then add the antioxidant and light stabilizer, and continue kneading at 70°C for 10 minutes. After completion, extrude to obtain the TPO layer; (3) First preheat and compound one side of the adhesive layer and the TPO layer at 125°C, and then hot press and compound the base board and the other side of the adhesive layer at 125°C to obtain a TPO-coated board with a base board, an adhesive layer, and a TPO layer from bottom to top in sequence.

[0039] Note: The modified slag fiber used in the above operations is obtained in Preparation Example 1; the thickness of the base board is 2 mm, the thickness of the adhesive layer is 100 μm, and the thickness of the TPO layer is 0.5 mm; the crosslinking agent is an organic peroxide crosslinking agent; the antioxidant is a hindered phenol antioxidant; the light stabilizer is an ultraviolet absorber; the particle size of the calcined kaolin is 40 μm, and the particle size of the calcined diatomaceous earth is 30 μm; the calcined kaolin is obtained by calcining kaolin raw materials at 850°C for 5.5 hours; the calcined diatomaceous earth is obtained by calcining diatomaceous earth raw materials at 700°C for 5.5 hours.

[0040] Examples 2 - 3 A TPO-coated board, which is different from Example 1 in that the raw materials for preparing the TPO layer and their corresponding weights are shown in Table 1.

[0041] Table 1 Raw materials for preparing the TPO layer and their weight parts (kg / part) in Examples 1 - 3 Raw materials Example 1 Example 2 Example 3 TPO resin 45 40 50 Ethylene propylene diene monomer rubber 12.5 10 15 Polypropylene 20 15 25 Crosslinking agent 2 1 3 Antioxidant 0.75 0.5 1 Light stabilizer 0.75 0.5 1 Calcined kaolin 0.6 0.4 0.8 Calcined diatomite 0.9 0.6 1.2 Modified slag fiber 3 2 4 Example 4 A TPO-coated board, which is different from Example 1 in that the total amount of calcined kaolin, calcined diatomaceous earth, and modified slag fiber remains unchanged, and the weight part ratio of the three is adjusted to 4:6:28.

[0042] Example 5 A TPO-coated board, which is different from Example 1 in that the modified slag fiber is obtained in Preparation Example 2.

[0043] Example 6 A TPO coated board, different from that of Example 1 in that the modified slag fiber is obtained in Preparation Example 3.

[0044] Example 7 A TPO coated board, different from that of Example 1 in that the modified slag fiber is obtained in Preparation Example 4.

[0045] Example 8 A TPO coated board, different from that of Example 1 in that the modified slag fiber is obtained in Preparation Example 5.

[0046] Example 9 A TPO coated board, different from that of Example 1 in that the modified slag fiber is obtained in Preparation Example 6.

[0047] Example 10 A TPO coated board, different from that of Example 1 in that the modified slag fiber is obtained in Preparation Example 7.

[0048] Example 11 A TPO coated board, different from that of Example 1 in that the particle size of the calcined kaolin is 30 μm and the particle size of the calcined diatomaceous earth is 20 μm.

[0049] Example 12 A TPO coated board, different from that of Example 1 in that the particle size of the calcined kaolin is 50 μm and the particle size of the calcined diatomaceous earth is 40 μm.

[0050] Example 13 A TPO coated board, different from that of Example 1 in that the calcined kaolin is obtained by calcining kaolin raw material at 800 °C for 6 h.

[0051] Example 14 A TPO coated board, different from that of Example 1 in that the calcined kaolin is obtained by calcining kaolin raw material at 900 °C for 5 h.

[0052] Example 15 A TPO coated board, different from that of Example 1 in that the calcined diatomaceous earth is obtained by calcining diatomaceous earth raw material at 750 °C for 5 h.

[0053] Example 16 A TPO coated board, different from that of Example 1 in that the calcined diatomaceous earth is obtained by calcining diatomaceous earth raw material at 650 °C for 5 h.

[0054] Comparative Example Comparative Example 1 A TPO-coated board, which is different from that of Example 1 in that calcined kaolin and calcined diatomaceous earth are not used in the raw materials for preparing the TPO layer.

[0055] Comparative Example 2 A TPO-coated board, which is different from that of Example 1 in that calcined kaolin and modified slag fiber are not used in the raw materials for preparing the TPO layer.

[0056] Comparative Example 3 A TPO-coated board, which is different from that of Example 1 in that calcined diatomaceous earth and modified slag fiber are not used in the raw materials for preparing the TPO layer.

[0057] Comparative Example 4 A TPO-coated board, which is different from that of Example 1 in that calcined kaolin is not used in the raw materials for preparing the TPO layer.

[0058] Comparative Example 5 A TPO-coated board, which is different from that of Example 1 in that calcined diatomaceous earth is not used in the raw materials for preparing the TPO layer.

[0059] Comparative Example 6 A TPO-coated board, which is different from that of Example 1 in that modified slag fiber is not used in the raw materials for preparing the TPO layer.

[0060] Comparative Example 7 A TPO-coated board, which is different from that of Example 1 in that calcined kaolin, calcined diatomaceous earth and modified slag fiber are not used in the raw materials for preparing the TPO layer.

[0061] Performance detection test Test samples: The TPO-coated boards obtained in Examples 1-16 were used as Test Samples 1-16, and the TPO-coated boards obtained in Comparative Examples 1-7 were used as Control Samples 1-7.

[0062] Test method: The peel strength of the TPO layer on the TPO-coated board was tested by the peel tester method.

[0063] The principle of the peel tester method is to fix the test film with a suction cup or fixture on the tester, and then separate it from the substrate at a certain speed and force, record the peel force and peel speed, and thus calculate the peel strength. This method has the advantages of high precision and high stability and is applicable to the peel strength test of various types of covering films.

[0064] The peel test instrument selected was the HTS-BLY2510 full-computer measurement and control peel strength tester of Nakano Seike.

[0065] After performing the above peel strength test on the TPO-coated board, the obtained value is denoted as A; then, the same type of TPO-coated board is placed in a high and low temperature alternating test chamber with an initial temperature of 25°C. First, it is heated to 85°C at a rate of 3°C / min, then cooled to -20°C at a rate of 1.5°C / min, and then heated to 25°C at a rate of 2°C / min, which is recorded as 1 cycle. After continuously performing 15 cycles, the peel strength test is carried out in the same way, and the obtained value is denoted as B; finally, calculate the peel strength loss rate of the TPO-coated board, peel strength loss rate = (A - B) / A. The larger the peel strength loss rate, the more micro-bubbles there are at the interface between the TPO layer and the adhesive layer, and the worse the adhesive stability shown.

[0066] After sequentially completing the above tests on test samples 1-16 and control samples 1-7, the corresponding results are recorded in Table 2.

[0067] Table 2 Test results of test samples 1-16 and control samples 1-7 Sample Peel strength loss rate (%) Test sample 1 5.46 Test sample 2 5.73 Test sample 3 5.61 Test sample 4 5.21 Test sample 5 5.56 Test sample 6 5.53 Test sample 7 5.67 Test sample 8 5.59 Test sample 9 5.65 Test sample 10 5.51 Test sample 11 5.63 Test sample 12 5.57 Test sample 13 5.68 Test sample 14 5.65 Test sample 15 5.70 Test sample 16 5.64 Control sample 1 20.09 Control sample 2 22.24 Control sample 3 22.57 Control sample 4 16.92 Control sample 5 17.25 Control sample 6 19.40 Control sample 7 25.41 Combined with Example 1 and Comparative Examples 1-7 and Table 2, it can be seen that by using modified slag fiber, calcined kaolin, and calcined diatomaceous earth in the raw materials of the TPO layer, the adhesive stability between the TPO layer and the adhesive layer can be significantly improved, and the peel strength loss rate obtained by the above test is also significantly reduced, indicating that the micro-bubbles at the interface between the TPO layer and the adhesive layer have been significantly reduced. At the same time, if any one or two of the modified slag fiber, calcined kaolin, and calcined diatomaceous earth are added to the TPO layer, although it can bring about an improvement in adhesive stability, the improvement effect is limited, and they are only a simple superposition of effects among each other. Only when the three are used in a combined and compounded manner can a significant compounding and synergistic effect be brought about, and then a TPO-coated board with excellent application stability can be obtained.

[0068] Combined with Example 1-3 and Example 4 and Table 2, it can be seen that when the weight ratio of calcined kaolin, calcined diatomaceous earth, and modified slag fiber is 4:6:28, the corresponding effects brought about by the structural system formed among them in the TPO layer are relatively excellent, a TPO-coated board with better quality can be obtained, and the peel strength loss rate obtained by the above test is relatively low.

[0069] Combined with Example 1 and Examples 5-16 and Table 2, it can be seen that the above-prepared modified slag fiber can exert a relatively excellent and stable compounding and synergistic effect with the calcined kaolin and calcined diatomaceous earth of the above specifications, and the peel strength loss rates obtained by the tests are all relatively good, indicating that the micro-bubbles at the interface between the TPO layer and the adhesive layer are significantly reduced, and there is excellent adhesive stability between the two.

[0070] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A TPO film-faced board, characterized in that: The substrate plate, the adhesive layer and the TPO layer are sequentially included from bottom to top, and the TPO layer is made of the following raw materials in parts by weight: 40-50 parts of TPO resin; 10-15 parts of EPDM rubber; Polypropylene 15-25 parts; 1-3 parts of cross-linking agent; Antioxidant 0.5-1 part; Light stabilizer 0.5-1 part; 0.4-0.8 parts of calcined kaolin; 0.6-1.2 parts of calcined diatomaceous earth; 2-4 parts of modified slag fiber; The modified slag fiber is prepared by the following steps: S1, taking slag fiber raw materials and mixing them with deionized water, dispersing and stirring them, letting them stand, taking the upper layer of fibers and drying them to obtain cleaned slag fibers; S2, impregnating the cleaned slag fiber with a sodium hydroxide solution, washing and drying to obtain pretreated slag fiber; S3, placing the pretreated slag fiber and the paraffin raw material in a sealed container, performing a vacuum treatment, then removing the vacuum and placing it aside, and finally drying it to obtain the modified slag fiber.

2. The TPO film-faced board according to claim 1, characterized in that: Step S2 is specifically configured as follows: the cleaned slag fiber is immersed in a sodium hydroxide solution at a solid-liquid ratio of 1: (25-30) for 30-50 minutes, the concentration of the sodium hydroxide solution is 3-4 mol / L, and the pretreated slag fiber is obtained after washing and drying.

3. The TPO film-faced board according to claim 1, characterized in that: Step S3 is specifically configured as follows: pretreated slag fiber and paraffin raw material are placed in a sealed container at a mass ratio of 1:(2-4), vacuum treated for 0.5-1.5 hours, then the vacuum is removed and left for 5-8 hours, and finally the modified slag fiber is obtained after drying.

4. The TPO film-faced board according to claim 1, characterized in that: The average diameter of the slag fiber raw material is 3-5 μm, and the average length is 5-7 mm; The particle size of the calcined kaolin is 30-50 μm; The particle size of the calcined diatomaceous earth is 20-40 μm.

5. The TPO film-faced board according to claim 1, characterized in that: The weight ratio of the calcined kaolin, calcined diatomaceous earth and modified slag fiber is 4:6:

28.

6. The TPO film-faced board according to claim 1, characterized in that: The calcined kaolin is obtained by calcining kaolin raw material at a constant temperature of 800-900° C. for 5-6 hours; The calcined diatomite is obtained by calcining diatomite raw material at a constant temperature of 650-750° C. for 5-6 hours.

7. The TPO film-faced board according to claim 1, characterized in that: The crosslinking agent is an organic peroxide crosslinking agent.

8. The TPO film-faced board according to claim 1, characterized in that: The antioxidant is one or a combination of hindered phenol antioxidants, phosphite antioxidants, thioether antioxidants and amine antioxidants.

9. The TPO film-faced board according to claim 1, characterized in that: The light stabilizer is one or a combination of hindered amine light stabilizer, ultraviolet light absorber, quencher and light shielding agent.

10. The method for preparing the TPO film-faced board according to claim 1, characterized in that: The following steps are involved: (1) preparing raw materials including TPO resin, EPDM rubber, polypropylene, crosslinking agent, antioxidant, light stabilizer, calcined kaolin, calcined diatomaceous earth and modified slag fiber according to the proportion; (2) mixing and kneading the TPO resin, EPDM rubber, polypropylene, crosslinking agent, calcined kaolin, calcined diatomaceous earth and modified slag fiber in step (1), adding an antioxidant and a light stabilizer, and continuing to knead, and extruding after completion to obtain a TPO layer; (3) Preheating and laminating one side of the adhesive layer and the TPO layer, and then hot pressing and laminating the substrate board and the other side of the adhesive layer to obtain a TPO coated board comprising a substrate board, an adhesive layer and a TPO layer from bottom to top.