An environment-friendly automotive interior ceiling and its preparation method

Abstract

This application relates to the field of processing of laminated interior ceilings, and specifically discloses an environmentally friendly automotive interior ceiling and its preparation method. An environmentally friendly automotive interior ceiling comprises, from bottom to top, a base fabric, a coated PET fiber felt, a base fabric, an adhesive, and a surface decorative layer; the base fabric is any one of non-woven fabric, film-coated non-woven fabric, or laminated non-woven fabric; its preparation method is as follows: polyurethane glue is coated on both the upper and lower surfaces of the PET fiber felt to obtain a coated PET fiber felt; after the coated PET fiber felt is sprayed with water, it is bonded to the base fabric, and then hot-pressed at a temperature of 100°C - 140°C for 40 - 120 s and cooled to obtain a semi-finished product; an adhesive is sprayed on the semi-finished product, the surface decorative layer is laid, and hot-pressed at 90°C - 120°C for 20 - 100 s. After cooling, it is cut, edge-bonded, and post-treated to obtain a finished product; it has the advantages of being green and environmentally friendly, having no pollution in the production process, not affecting the human health of users, being conducive to recycling, and having a long service life.

Description

Technical Field

[0001] The present application relates to the field of processing of laminated interior ceilings, and more specifically, to an environment-friendly automotive interior ceiling and a preparation method thereof. Background Art

[0002] The automotive interior ceiling is an important part of the interior space of a vehicle, usually located at the top inside the carriage and connected to the roof part. It is mainly composed of materials such as fabric, base material, and filler, and has multiple functions such as decoration, sound absorption, heat insulation, sunshading, and safety.

[0003] Currently, there are mainly two production processes for automotive ceilings in the market: the dry process and the wet process. Their structures are non-woven fabric / glass fiber / PE powder / adhesive film / PU foam sheet (33 - 40 kg / m 3 ), or glass fiber / PE powder and non-woven fabric / glass fiber felt / adhesive / PU foam sheet (16 - 26 kg / m 3 ) / adhesive / glass fiber felt / non-woven fabric. During the production process, glass fiber and glass fiber felt cause certain harm to the human skin, PE powder pollutes the environment, and the PU foam sheet is prone to volatilize odoriferous volatile substances. The produced interior products not only affect the air quality inside the vehicle, but also affect the driving experience and physical and mental health of consumers; at the same time, they also affect the surrounding environment during the manufacturing process.

[0004] Therefore, how to prepare a new automotive interior ceiling with the advantages of being green and environmentally friendly, pollution-free in the production process, not affecting the human health of users, being conducive to recycling, and having a long service life is a problem to be solved. Summary of the Invention

[0005] In order to prepare a new automotive interior ceiling with the advantages of being green and environmentally friendly, pollution-free in the production process, not affecting the human health of users, being conducive to recycling, and having a long service life, the present application provides an environment-friendly automotive interior ceiling and a preparation method thereof.

[0006] In a first aspect, the present application provides an environment-friendly automotive interior ceiling, adopting the following technical solution:

[0007] An environment-friendly automotive interior ceiling, wherein the interior ceiling sequentially comprises a base cloth, a coated PET fiber felt, a base cloth, an adhesive, and a surface decoration layer from bottom to top; the base cloth is any one of non-woven fabric, coated non-woven fabric, or laminated non-woven fabric; the coated PET fiber felt is obtained by coating both sides of a PET fiber felt with polyurethane glue.

[0008] By adopting the above technical scheme, non-woven fabric is used as the base fabric and distributed on both sides of the glue-coated PET fiber felt, and then the adhesive is bonded, and finally the surface decorative layer is attached. By utilizing the good adhesion effect of polyurethane glue and its own good elastic effect, a car interior ceiling with good flexibility can be prepared. In addition, polyurethane glue, non-woven fabric and other materials are green and environmentally friendly, and are not easy to cause pollution during the production process, and are not easy to affect the health of users. At the same time, the stable bonding between the layers can avoid the problem of layer peeling as much as possible, thereby extending the service life of the interior ceiling, and it also has the advantage of being easy to recycle.

[0009] Preferably, the PET fiber felt is mixed with 10%-20% by weight of low-melting point polyester fibers and 80%-90% by weight of conventional polyester fibers, and is subjected to opening, carding, web laying, hot pressing, qualitative analysis, ironing, and slicing to obtain a PET fiber felt blank; the PET fiber felt blank is treated with a citric acid solution, drained, air-dried, then treated with a polyethylene glycol ethanol solution, and finally washed and dried.

[0010] By adopting the above technical scheme, low-melting point polyester fiber and conventional polyester fiber are matched. The low-melting point polyester fiber can reduce energy consumption and improve processing effect during the hot melt molding process. At the same time, the low-melting point polyester fiber can be used as a binder to improve the bonding stability of the PET fiber felt, while the conventional polyester fiber has higher strength and wear resistance, which can improve the durability of the PET fiber felt, thereby ensuring that the finished interior ceiling has a longer service life.

[0011] After the PET fiber felt blank is treated with citric acid solution, on the one hand, it is easy to remove impurities, and on the other hand, it can improve the hydrophilicity of the fiber felt blank. The carboxyl group in citric acid can form hydrogen bonds with the polar groups of PET fiber, such as carboxyl and hydroxyl, to form more hydrophilic groups on the fiber surface, thereby introducing more hydrophilic groups to the fiber surface, making it easier to absorb polyurethane glue and improving the adhesion stability and fastness of polyurethane glue on the surface of PET fiber felt. Moreover, the PET fiber felt treated with citric acid has a good antistatic effect, which improves the antistatic effect of the interior ceiling, reduces the adsorption of dust, and ensures the quality of the interior ceiling.

[0012] After the citric acid solution treatment, the polyethylene glycol ethanol solution treatment is used. The polyethylene glycol ethanol solution has a good flow dispersion effect, so that the fibers on the surface of the PET fiber felt can be evenly dispersed and not stick to each other, ensuring that the PET fiber felt can contact the polyurethane glue with a larger contact area, thereby improving the bonding stability of the polyurethane glue on the surface of the PET fiber felt, extending the service life of the automobile interior ceiling, and preventing layer peeling problems from occurring.

[0013] Preferably, the polyethylene glycol ethanol solution is prepared from a 1% polyethylene glycol 1000 ethanol solution, cetearyl alcohol, and chitosan microspheres with a mass ratio of 1:0.1 - 0.15:0.05 - 0.1.

[0014] By adopting the above technical solution, using the flow lubrication effect of cetearyl alcohol and cooperating with a polyethylene glycol ethanol solution with a lower mass fraction and a lower molecular weight, it is not only convenient for the chitosan microspheres to uniformly contact the filaments of the PET fiber felt, but also can improve the smoothness effect of the polyurethane glue during the gluing process, reduce the coating resistance, and ensure the coating uniformity.

[0015] The amino and carboxyl groups in the chitosan microparticles can be adsorbed and connected to the carboxyl groups on the filaments on the surface of the PET fiber felt; the chitosan microparticles have good hydrophilic and adsorption effects. When the chitosan microparticles come into contact with the polyurethane glue, by using the hydroxyl groups of polyethylene glycol, the hydroxyl groups of cetearyl alcohol, and the amino and carboxyl groups of the chitosan microparticles in combination with the porous adsorption effect of the chitosan microparticles, while adsorbing the polyurethane glue, they can crosslink with the hydroxyl groups and isocyanate groups in the polyurethane glue, further improving the adsorption effect and adhesion fastness of the polyurethane glue on the surface of the PET fiber felt.

[0016] Preferably, the chitosan microspheres are prepared from chitosan microsphere particles loaded with fucoidan solution with a mass ratio of 1:0.1 - 0.2.

[0017] By adopting the above technical solution, after the chitosan microsphere particles are loaded with fucoidan, since the chitosan microspheres and fucoidan are insoluble in ethanol, it is convenient for the chitosan microspheres to adhere to the surface of the filaments of the PET fiber felt; after coating the polyurethane glue, by using the hydrophilic viscosity of fucoidan and the crosslinking effect between the chitosan microspheres and the polyurethane, the adhesion stability of the polyurethane glue on the surface of the PET fiber felt is further improved, and the service life of the interior ceiling is extended.

[0018] Preferably, the polyurethane glue comprises the following raw materials in parts by weight:

[0019] 30 - 50 parts of polyester polyol, 40 - 60 parts of polyether polyol, 0.2 - 0.8 part of catalyst, 50 - 90 parts of isocyanate, 0.5 - 1 part of crosslinking agent, 1 - 3 parts of flow promoter, 1 - 3 parts of styrene-butadiene rubber-coated sodium alginate, 1 - 2 parts of shellac-loaded microcrystalline cellulose.

[0020] By adopting the above technical solutions, styrene-butadiene rubber-coated sodium alginate and shellac-loaded microcrystalline cellulose are combined. During the preparation of polyurethane glue, the sodium alginate and microcrystalline cellulose blocked by styrene-butadiene rubber and shellac do not affect the viscosity of the polyurethane glue during the gluing process, ensuring that the polyurethane glue can be evenly and stably coated on the surface of the PET fiber felt. In the thermal curing stage of the polyurethane glue, styrene-butadiene rubber and shellac can crosslink with substances such as polyester polyol, polyether polyol, and isocyanate, increasing the viscosity of the polyurethane glue, thereby improving the bonding effect between the polyurethane glue and the PET fiber felt, enabling the base fabric and the PET fiber felt to have good adhesion stability, and extending the service life of the interior ceiling.

[0021] Preferably, the styrene-butadiene rubber-coated sodium alginate is prepared from a styrene-butadiene rubber solution and sodium alginate particles with a mass ratio of 1:0.5 - 1.

[0022] By adopting the above technical solutions, the sodium alginate particles blocked by styrene-butadiene rubber, in the thermal curing stage, after the styrene-butadiene rubber melts, sodium alginate can adsorb the sprayed moisture and crosslink with other components in the polyurethane glue containing carboxyl, hydroxyl and other substances, increasing the viscosity of the polyurethane glue after coating, ensuring the bonding effect between the base fabric and the PET fiber felt, not easily having delamination problems, and extending the service life of the interior ceiling.

[0023] Preferably, the shellac-loaded microcrystalline cellulose is prepared from a shellac-loaded polyvinyl alcohol solution and microcrystalline cellulose with a mass ratio of 1:0.5 - 1:1 - 1.5.

[0024] By adopting the above technical solutions, microcrystalline cellulose is loaded on the surface of shellac using the viscosity of the polyvinyl alcohol solution. In the water spraying stage, microcrystalline cellulose absorbs water, increasing the viscosity of the polyurethane. And in the thermal curing process, shellac melts to increase viscosity, while the hydroxyl groups in polyvinyl alcohol and microcrystalline cellulose further improve the crosslinking density, thereby further increasing the viscosity of the polyurethane glue, ensuring the stable bonding of the polyurethane glue on the surface of the PET fiber felt, enabling the stable bonding between the base fabric and the PET fiber felt, not easily having delamination problems, and extending the service life of the interior ceiling.

[0025] Preferably, the polyester polyol is one or more of 205U, 205UC, 210CP, 220UA; the polyether polyol is one or more of DL-2000, 210, diethylene glycol, ethylene glycol, glycerol, 330N; the isocyanate is one or more of PM200, PM400, PM600, M20S; the catalyst is one or more of T12, T120, A33, DE0A, TE0A.

[0026] By adopting the above technical solutions, the polyurethane glue has good adhesion and coating effects.

[0027] In a second aspect, the present application provides a method for preparing an environment-friendly automotive interior ceiling, adopting the following technical solutions:

[0028] A method for preparing an environment-friendly automotive interior ceiling includes the following steps:

[0029] S1. Uniformly coat polyurethane glue on both the upper and lower surfaces of the PET fiber felt to obtain a glue-coated PET fiber felt;

[0030] S2. After uniformly spraying water on both the upper and lower surfaces of the glue-coated PET fiber felt, bond the base fabric, then hot press and form at a temperature of 100°C - 140°C for 40 - 120 s, and then cool to obtain a semi-finished product;

[0031] S3. Uniformly spray adhesive on the upper surface of the semi-finished product, then lay the surface decorative layer, hot press at a temperature of 90°C - 120°C for 20 - 100 s, and after cooling, cut, edge-wrap, and post-treat to obtain the finished automotive ceiling.

[0032] By adopting the above technical solutions, after coating the polyurethane glue and cooperating with the water spraying treatment, the bonding effect between the polyurethane glue and the chitosan microspheres on the surface of the PET fiber felt, as well as the hydroxyl and carboxyl groups on the surface of the fiber filaments, is further improved, facilitating the tight bonding of the embryo fabric and the PET fiber felt, and having certain water resistance and moisture resistance, as well as good flexibility and strength, which can improve the service life of the interior ceiling.

[0033] Hot press and form under relatively high temperature conditions. While ensuring the curing of the polyurethane glue, it can also promote the cross-linking of the polyurethane glue with substances such as hydroxyl groups, carboxyl groups, and chitosan microspheres on the surface of the PET fiber felt. At the same time, styrene-butadiene rubber and shellac in the polyurethane glue can be melted during the curing process, further increasing the viscosity, ensuring the structural stability of the interior ceiling, not easily having delamination problems, and extending the service life of the interior ceiling.

[0034] Preferably, the polyurethane glue is prepared by the following method:

[0035] Heat polyester polyol and polyether polyol under negative pressure at 60 - 80°C and a vacuum degree of 0.05 - 0.1 MPa for 1 - 3 h, then add isocyanate, catalyst, cross-linking agent, and flow promoter, react at 80 - 90°C for 1 - 4 h, add sodium alginate coated with styrene-butadiene rubber, microcrystalline cellulose loaded with shellac, and water at a temperature of 80 - 85°C, mix and stir for 20 - 30 min, and finally vacuum for 1 - 2 h to obtain the finished polyurethane glue.

[0036] By adopting the above technical solution, the reaction is carried out at 80-90 °C to ensure the cross-linking effect of the polyurethane. Under the action of the flow promoter, the polyurethane glue has a smooth coating effect on the surface of the PET fiber felt. While ensuring the production effect, the coating uniformity is guaranteed. Then, at 80-85 °C, sodium alginate coated with styrene-butadiene rubber and microcrystalline cellulose with shellac carrier are added. Styrene-butadiene rubber and shellac are not easily melted by heat and affect the coating fluidity of the polyurethane. During the subsequent heating and curing process, styrene-butadiene rubber and shellac gradually soften and melt, ensuring the bonding effect of the polyurethane glue and improving the adhesion stability between the base fabric and the PET fiber felt, thereby extending the service life of the interior ceiling.

[0037] In summary, the present application has the following beneficial effects:

[0038] 1. The non-woven fabric is used as the base fabric and distributed on both sides of the coated PET fiber felt, then the adhesive is bonded, and finally the surface decorative layer is laminated. Utilizing the good adhesion effect of the polyurethane glue and its own good elastic effect, a car interior ceiling with good flexibility can be prepared. Moreover, materials such as polyurethane glue and non-woven fabric have the characteristics of environmental protection, are not easily polluted during the production process, do not easily affect the health of users, and have the advantage of being conducive to recycling.

[0039] 2. The cooperation of sodium alginate coated with styrene-butadiene rubber, microcrystalline cellulose with shellac carrier, and flow promoter in the polyurethane glue and the treatment with polyethylene glycol ethanol solution and citric acid solution on the surface of the PET fiber felt result in a good flow effect during the coating process of the polyurethane glue, and it is not easy to have too high viscosity to affect the coating uniformity and fluidity. After the coating is completed, during the hot pressing process, styrene-butadiene rubber and shellac gradually melt. The melted liquid can not only improve the adhesion of the polyurethane glue, but also sodium alginate and microcrystalline cellulose can further cross-link with the polyurethane glue. Combining with the water sprayed on the surface of the polyurethane glue, the polyurethane glue not only has a good bonding effect with the PET fiber felt, but also has a good bonding property with base fabric materials such as non-woven fabric, ensuring the adhesion stability of each layer of the interior ceiling, not easily having the problem of layer peeling, and extending the service life of the interior ceiling.

[0040] 3. The cooperation of the PET fiber felt and the polyurethane glue, utilizing the cross-linked three-dimensional network structure and the strength and flexibility of substances such as styrene-butadiene rubber and shellac, improves the strength and flexibility of the interior ceiling, thereby extending the service life of the interior ceiling.

[0041] 4. The glue has a low viscosity, which is convenient for coating but has a poor adhesion effect. If the viscosity of the glue is too high, although it has a good bonding effect, there are problems such as difficulty in coating and uneven coating. In the polyurethane glue, styrene-butadiene rubber and shellac are insoluble in water. After blocking sodium alginate and microcrystalline cellulose, they are not easy to affect the viscosity of the polyurethane glue, thus ensuring the coating effect of the polyurethane glue. During the heating and thermal curing process, the viscosity of the polyurethane glue on the surface of the PET fiber felt is increased, thereby ensuring the bonding effect.

[0042] 5. Cetearyl alcohol and shellac can improve the water resistance, wear resistance and stability of the polyurethane glue, and extend the service life of the interior ceiling. Specific embodiments

[0043] The following further elaborates on this application in conjunction with examples.

[0044] Preparation examples of PET fiber felt

[0045] The following raw materials are all commercially available.

[0046] Preparation example 1: The PET fiber felt was prepared by the following method:

[0047] Take 10% by mass of low-melting polyester fiber and 95% of conventional polyester fiber and mix them. The melting point of the low-melting polyester fiber is 130 °C, and the melting point of the conventional polyester fiber is 250 °C. After opening, carding, web-forming, hot pressing, sizing, calendering, and slicing, a PET fiber felt with an average thickness of 20 mm and a gram weight of 300 g / m 2 is obtained.

[0048] Preparation example 2: The PET fiber felt was prepared by the following method:

[0049] Take 20% by mass of low-melting polyester fiber and 80% of conventional polyester fiber and mix them. After opening, carding, web-forming, hot pressing, sizing, calendering, and slicing, a PET fiber felt with an average thickness of 25 mm and a gram weight of 350 g / m 2 is obtained.

[0050] Preparation example 3: The PET fiber felt was prepared by the following method:

[0051] Take 20% by mass of low-melting polyester fiber and 80% of conventional polyester fiber and mix them. The melting point of the low-melting polyester fiber is 130 °C, and the melting point of the conventional polyester fiber is 250 °C. After opening, carding, web-forming, hot pressing, sizing, calendering, and slicing, a PET fiber felt blank is obtained;

[0052] Spray 0.2 kg of fucoidan solution evenly on the surface of 1 kg of chitosan microspheres. The average particle size of the chitosan microspheres is 5 μm, and the fucoidan solution is an aqueous solution of fucoidan with a mass fraction of 0.5%. After drying and dispersing, the chitosan microspheres do not adhere to each other, and chitosan microspheres are obtained.

[0053] Add 0.15 kg of cetearyl alcohol and 0.1 kg of chitosan microspheres to 1 kg of polyethylene glycol 1000 ethanol solution with a mass fraction of 1%, and mix and stir evenly to obtain a polyethylene glycol ethanol solution; the mass fraction of ethanol is 75%.

[0054] After the PET fiber felt blank is completely immersed in the citric acid solution for 20 min, wash it once with water, air-dry it, then completely immerse it in the polyethylene glycol ethanol solution for 20 min, and finally drain the excess liquid on the surface. After drying, a PET fiber felt is prepared.

[0055] Preparation Example 4: The difference between this preparation example and Preparation Example 3 is as follows:

[0056] Mix 20% by mass of low-melting polyester fiber and 80% of conventional polyester fiber, and through opening, carding, web-forming, hot pressing, setting, calendering, and slicing, obtain a PET fiber felt blank with an average thickness of 25 mm and a grammage of 350 g / m 2 of.

[0057] Spray 0.1 kg of fucoidan solution evenly on the surface of 1 kg of chitosan microspheres to obtain chitosan microspheres.

[0058] Add 0.1 kg of cetearyl alcohol and 0.05 kg of chitosan microspheres to 1 kg of polyethylene glycol 1000 ethanol solution with a mass fraction of 1%, and mix and stir evenly to obtain a polyethylene glycol ethanol solution.

[0059] After the PET fiber felt blank is completely immersed in the citric acid solution for 20 min, wash it once with water, air-dry it, then completely immerse it in the polyethylene glycol ethanol solution for 20 min, and finally drain the excess liquid on the surface. After drying, a PET fiber felt is prepared.

[0060] Preparation Example of Polyurethane Adhesive

[0061] Among the following raw materials, polyester polyols 205U, 205UC, 210CP, and 220UA are purchased from Asahi Kasei Chemicals (Suzhou) Co., Ltd.; polyether polyol DL-2000 is purchased from Shandong Bluestar Dongda Chemical Co., Ltd.; polyether polyol 210 is purchased from Jurong Ningwu New Materials Co., Ltd.; isocyanates PM200, PM400, PM600, and M20S are purchased from BASF SE; catalysts T12, T120, A33, DE0A, and TE0A are purchased from Evonik Degussa (Shanghai) Co., Ltd.; other raw materials are all commercially available.

[0062] Preparation Example 5: The polyurethane glue was prepared by the following method:

[0063] 80 kg of polyester polyol, 10 kg of polyether polyol, 0.3 kg of catalyst, and 60 kg of isocyanate; the polyester polyol was 205U, the polyether polyol was DL-2000; the catalyst was T12; the isocyanate was PM200;

[0064] The preparation method was as follows:

[0065] The polyester polyol and polyether polyol were heated under negative pressure at 60 °C and a vacuum degree of 0.06 MPa for 2.5 h for dehydration to remove small molecule substances, then the catalyst and isocyanate were added, and the reaction was carried out at 90 °C for 3 h. Finally, small molecule substances were removed under vacuum for 2 h to obtain the polyurethane glue.

[0066] Preparation Example 6: The polyurethane glue was prepared by the following method:

[0067] 70 kg of polyester polyol, 10 kg of polyether polyol, 0.4 kg of catalyst, and 70 kg of isocyanate; the polyester polyol was 205UC, the polyether polyol was 210; the catalyst was T120; the isocyanate was PM400;

[0068] The preparation method was as follows:

[0069] The polyester polyol and polyether polyol were heated under negative pressure at 60 °C and a vacuum degree of 0.06 MPa for 2 h for dehydration to remove small molecule substances, then the catalyst and isocyanate were added, and the reaction was carried out at 90 °C for 3.5 h. Finally, small molecule substances were removed under vacuum for 3 h to obtain the polyurethane glue.

[0070] Preparation Example 7: The polyurethane glue was prepared by the following method:

[0071] The styrene-butadiene rubber was heated to 100 °C for complete melting to obtain a styrene-butadiene rubber solution, which was then evenly sprayed onto the surface of 1 kg of sodium alginate microparticles with an average particle size of 10 μm. After drying and dispersion, styrene-butadiene rubber-coated sodium alginate was obtained; the finished product was sieved through a 600-mesh sieve;

[0072] 1 kg of polyvinyl alcohol solution was evenly sprayed onto the surface of 1 kg of shellac with an average particle size of 20 μm. The polyvinyl alcohol solution was an aqueous solution of polyvinyl alcohol with a mass fraction of 1%. Then, 1.5 kg of microcrystalline cellulose with an average particle size of 3 μm was added, and the addition rate of microcrystalline cellulose was 30 g / min. During the addition process, the shellac was continuously stirred at a rotation speed of 80 r / min. After mixing evenly, it was dried and dispersed to obtain shellac-loaded microcrystalline cellulose; the finished product was sieved through a 500-mesh sieve;

[0073] 40 kg of polyester polyol, 50 kg of polyether polyol, 0.5 kg of catalyst, 80 kg of isocyanate, 1 kg of crosslinking agent, 2 kg of flow promoter, 2 kg of styrene-butadiene rubber-coated sodium alginate, 2 kg of shellac-loaded microcrystalline cellulose; the polyester polyol has a viscosity of 210 CP; the polyether polyol is ethylene glycol; the crosslinking agent is ethylenediamine; the flow promoter is polyethylene glycol 600; the isocyanate is PM600; the catalyst is A33;

[0074] The preparation method is as follows:

[0075] The polyester polyol and the polyether polyol are heated under negative pressure for 3 h at 70 °C and a vacuum degree of 0.1 MPa, then the isocyanate, catalyst, crosslinking agent, and flow promoter are added, and the reaction is carried out at 90 °C for 2 h. At a temperature of 80 °C, the styrene-butadiene rubber-coated sodium alginate and the shellac-loaded microcrystalline cellulose are added, and the mixture is stirred for 30 min. Finally, it is vacuumed for 2 h to obtain the finished polyurethane glue.

[0076] Preparation Example 8: The difference between this preparation example and Preparation Example 7 is that:

[0077] The styrene-butadiene rubber is heated to 100 °C until completely melted to obtain a styrene-butadiene rubber solution, which is then evenly sprayed on the surface of 0.5 kg of sodium alginate particles. After drying and dispersing, the styrene-butadiene rubber-coated sodium alginate is obtained;

[0078] 0.5 kg of polyvinyl alcohol solution is evenly sprayed on the surface of 1 kg of shellac, and then 1 kg of microcrystalline cellulose is added. The addition rate of the microcrystalline cellulose is 30 g / min. During the addition process, the shellac is continuously stirred at a rotation speed of 80 r / min. After mixing evenly, it is dried and dispersed to obtain the shellac-loaded microcrystalline cellulose;

[0079] 30 kg of polyester polyol, 40 kg of polyether polyol, 0.2 kg of catalyst, 50 kg of isocyanate, 0.5 kg of crosslinking agent, 1 kg of flow promoter, 1 kg of styrene-butadiene rubber-coated sodium alginate, 1 kg of shellac-loaded microcrystalline cellulose; the polyester polyol is 220 UA; the polyether polyol is glycerol; the isocyanate is M20S; the catalyst is TEOA;

[0080] The preparation method is as follows:

[0081] The polyester polyol and the polyether polyol are heated under negative pressure for 3 h at 60 °C and a vacuum degree of 0.05 MPa, then the isocyanate, catalyst, crosslinking agent, and flow promoter are added, and the reaction is carried out at 80 °C for 1 h. At a temperature of 80 °C, the styrene-butadiene rubber-coated sodium alginate and the shellac-loaded microcrystalline cellulose are added, and the mixture is stirred for 20 min. Finally, it is vacuumed for 1 h to obtain the finished polyurethane glue.

[0082] Preparation Example 9: The difference between this preparation example and Preparation Example 7 is that:

[0083] 50 kg of polyester polyol, 60 kg of polyether polyol, 0.8 kg of catalyst, 90 kg of isocyanate, 1 kg of crosslinking agent, 3 kg of flow promoter, 3 kg of styrene-butadiene rubber-coated sodium alginate, 2 kg of shellac-loaded microcrystalline cellulose;

[0084] The preparation method is as follows:

[0085] The polyester polyol and polyether polyol are heated under negative pressure for 1 h at 80°C and a vacuum degree of 0.1 MPa, and then isocyanate, catalyst, crosslinking agent, and flow promoter are added and reacted at 90°C for 1 h. Styrene-butadiene rubber-coated sodium alginate and shellac-loaded microcrystalline cellulose are added at 85°C, and the mixture is stirred for 30 min. Finally, it is vacuumed for 2 h to obtain the finished polyurethane glue. Example

[0086] Among the following raw materials, the adhesive is purchased from Yantai Yunlong Chemical Products Co., Ltd. and is ZH-P2240.0; other raw materials are all commonly sold in the market.

[0087] Example 1: An environment-friendly automotive interior ceiling:

[0088] The interior ceiling from bottom to top is successively a base cloth, a coated PET fiber felt, a base cloth, an adhesive, and a surface decoration layer; the surface decoration layer is a PVC layer;

[0089] The preparation method is as follows:

[0090] S1. The polyurethane glue of Preparation Example 5 is evenly coated on both sides of the PET fiber felt by a roller coater, and the coating amount is 160 g / m 2 , to obtain a coated PET fiber felt; the PET fiber felt is the PET fiber felt prepared in Preparation Example 1;

[0091] S2. Water is evenly sprayed on one side surface of the coated PET fiber felt, and the water spraying amount is 40 g / m 2 . The water-sprayed side of the coated PET fiber felt is adhered to the base cloth, and the base cloth is a non-woven fabric of 60 g / m 2 . Then, with the other side of the coated PET fiber felt facing up, after evenly spraying water on the other side, the water spraying amount is 40 g / m 2 , and it is adhered to the base cloth, and the base cloth is a non-woven fabric of 45 g / m 2 . Then, it is hot-pressed and formed at 120°C for 80 s and then cooled to obtain a semi-finished product;

[0092] S3. The adhesive is evenly sprayed on the surface of the semi-finished product, and then the surface decoration layer is laid. It is hot-pressed at 110°C for 60 s, and after cooling, it is subjected to post-treatment such as cutting, edge wrapping, and grinding to obtain the finished automotive ceiling.

[0093] Embodiment 2: This embodiment differs from Embodiment 1 in that:

[0094] The preparation method is as follows:

[0095] S1. The upper and lower surfaces of the PET fiber felt are evenly coated with the polyurethane glue of Preparation Example 6 by a roller glue machine, and the coating amount is 160g / m 2 , obtaining a rubber-coated PET fiber felt; the PET fiber felt is the PET fiber felt prepared in Preparation Example 2;

[0096] S2. Spray water evenly on one side of the rubber-coated PET fiber felt. The amount of water sprayed is 40g / m2. Put the water-sprayed side of the rubber-coated PET fiber felt on the base fabric. The base fabric is 70g / m 2 The non-woven fabric is then coated with the PET fiber felt with the other side facing upwards, and the other side is evenly sprayed with water at a rate of 40g / m 2 , laminated base fabric, base fabric is 45g / m 2 The non-woven fabric is then heat-pressed at 100°C for 120s and then cooled to obtain a semi-finished product;

[0097] S3. Spray adhesive evenly on the surface of the semi-finished product, then lay the surface decoration layer, hot press at 90°C for 100s, and after cooling, cut, hem and polish to obtain a finished car roof.

[0098] Embodiment 3: An environmentally friendly automobile interior ceiling:

[0099] The interior ceiling is composed of base fabric, PET fiber felt coated with glue, base fabric, adhesive, and surface decoration layer from bottom to top; the surface decoration layer is PVC layer;

[0100] The preparation method is as follows:

[0101] S1. The upper and lower surfaces of the PET fiber felt are evenly coated with the polyurethane glue of Preparation Example 7 by a roller glue machine, and the coating amount is 160g / m 2 , obtaining a rubber-coated PET fiber felt; the PET fiber felt is the PET fiber felt prepared in Preparation Example 3;

[0102] S2. Spray water evenly on one side of the PET fiber felt coated with glue, with a water spray volume of 40g / m 2 , stick the water-sprayed side of the coated PET fiber felt to the base fabric, the base fabric is 60g / m 2 The non-woven fabric is then coated with the PET fiber felt with the other side facing upwards, and the other side is evenly sprayed with water at a rate of 40g / m 2 , laminated base fabric, base fabric is 45g / m 2 The non-woven fabric is then heat-pressed at 120°C for 80 seconds and then cooled to obtain a semi-finished product;

[0103] S3. Uniformly spray adhesive on the surface of the semi-finished product, then lay the surface decorative layer, and hot press at 110 °C for 60 s. After cooling, through post-treatments such as cutting, edge wrapping, and grinding, the finished car roof lining is obtained.

[0104] Example 4: The difference between this example and Example 3 is that:

[0105] The interior roof lining from bottom to top is successively a base fabric, a coated PET fiber felt, a base fabric, an adhesive, and a surface decorative layer; the base fabric is a film-coated non-woven fabric; the surface decorative layer is a PVC layer;

[0106] The preparation method is as follows:

[0107] S1. Uniformly coat the polyurethane glue of Preparation Example 8 on both sides of the PET fiber felt through a roller gluing machine, and the glue coating amount is 160 g / m 2 , to obtain a coated PET fiber felt; the PET fiber felt is the PET fiber felt prepared in Preparation Example 4;

[0108] S2. Uniformly spray water on one side surface of the coated PET fiber felt, and the water spraying amount is 40 g / m 2 , attach the water-sprayed side of the coated PET fiber felt to the base fabric, then turn the other side of the coated PET fiber felt upwards, and after uniformly spraying water on the other side, the water spraying amount is 40 g / m 2 , attach the base fabric, then hot press and form at 140 °C for 40 s, and then cool to obtain a semi-finished product;

[0109] S3. Uniformly spray adhesive on the surface of the semi-finished product, then lay the surface decorative layer, and hot press at 120 °C for 20 s. After cooling, through post-treatments such as cutting, edge wrapping, and grinding, the finished car roof lining is obtained.

[0110] Example 5: The difference between this example and Example 3 is that:

[0111] The polyurethane glue is the polyurethane glue prepared in Preparation Example 9.

[0112] Example 6: The difference between this example and Example 3 is that:

[0113] During the treatment process of the PET fiber felt, cetearyl alcohol and chitosan microspheres are not added to the polyethylene glycol ethanol solution.

[0114] Example 7: The difference between this example and Example 3 is that:

[0115] During the preparation process of the polyurethane glue, sodium alginate of the same mass is used to replace sodium alginate coated with styrene-butadiene rubber, and microcrystalline cellulose of the same mass is used to replace microcrystalline cellulose as the shellac carrier.

[0116] Example 8: The difference between this example and Example 3 is that:

[0117] In the preparation process of the shellac carrier microcrystalline cellulose of the polyurethane glue, no polyvinyl alcohol solution was added.

[0118] Example 9: The difference between this example and Example 3 is that:

[0119] In the preparation process of the PET fiber felt, it was not treated with a citric acid solution.

[0120] Example 10: The difference between this example and Example 3 is that:

[0121] In the preparation process of the PET fiber felt, it was not treated with a polyethylene glycol ethanol solution.

[0122] Performance detection test

[0123] 1. Adhesion effect detection

[0124] The interior roof linings were prepared by the methods of Examples 1-10 respectively. An electronic universal testing machine was used to test the peel strength between the base fabric and the PET fiber felt on the interior roof lining with reference to GB / T7122-1996, and the data was recorded.

[0125] 2. Bending strength detection

[0126] The interior roof linings were prepared by the methods of Examples 1-10 respectively. An electronic universal testing machine was used to test the bending strength of the interior roof lining with reference to SMTC 5330 007-2019, and the data was recorded.

[0127] 3. Viscosity detection

[0128] The interior roof linings were prepared by the methods of Examples 1-5 and 7 respectively. A viscometer was used to test the viscosity of the polyurethane glue with reference to GB / T2794-2013, and the data was recorded.

[0129] Table 1 Performance test table (in the table, " / " represents that the corresponding example did not detect this item, so there is no data)

[0130]

[0131] Combined with Examples 1-2 and Table 1, it can be seen that the interior roof lining prepared in this application has a high peel strength and bending strength, can extend the service life of the interior roof lining, and the viscosity of the glue is moderate, which can ensure the uniformity and fluidity of glue application.

[0132] Combined with Example 1 and Examples 3-5 and in conjunction with Table 1, it can be seen that the treated PET fiber felt, when combined with the polyurethane glue containing sodium alginate coated with styrene-butadiene rubber and microcrystalline cellulose loaded with shellac, ensures good coating fluidity and uniformity of the glue. Moreover, during the curing process after coating, it can improve the bonding effect between the polyurethane glue and the base fabric, enhance the bonding fastness, thereby increasing the peel strength and bending strength, and thus extending the service life of the interior ceiling.

[0133] Combined with Example 3 and Examples 6-10 and in conjunction with Table 1, it can be seen that during the treatment process of the PET fiber felt in Example 6, cetearyl alcohol and chitosan microspheres were not added to the polyethylene glycol ethanol solution. Compared with Example 3, the peel strength of Example 6 is lower than that of Example 3, and the bending strength is lower than that of Example 3. This shows that cetearyl alcohol and chitosan microspheres can improve the bonding effect between the polyurethane glue and the non-woven fabric and PET fiber felt, thereby enhancing the bonding effect of the polyurethane glue and extending the service life of the interior ceiling.

[0134] During the preparation of the polyurethane glue in Example 7, sodium alginate coated with styrene-butadiene rubber was replaced with sodium alginate of the same mass, and microcrystalline cellulose loaded with shellac was replaced with microcrystalline cellulose of the same mass. Compared with Example 3, the peel strength of Example 7 is lower than that of Example 3, the bending strength is lower than that of Example 3, and the viscosity is higher than that of Example 3. This indicates that sodium alginate and microcrystalline cellulose without coating treatment can increase the viscosity of the polyurethane glue, which easily affects the coating effect of the polyurethane glue. And styrene-butadiene rubber and shellac can improve the crosslinking bonding effect between the polyurethane glue and the PET fiber felt and non-woven fabric, thereby further enhancing the adhesion fastness between the layers of the interior ceiling, and thus extending the service life of the interior ceiling.

[0135] During the preparation of the microcrystalline cellulose loaded with shellac in the polyurethane glue of Example 8, the polyvinyl alcohol solution was not added. Compared with Example 3, the peel strength of Example 8 is lower than that of Example 3, and the bending strength is lower than that of Example 3. This shows that the hydroxyl groups in the polyvinyl alcohol solution can crosslink with the carboxyl and hydroxyl groups on the surface of the PET fiber felt, and during the curing stage, further improve the bonding effect between the polyurethane glue and the PET fiber felt and non-woven fabric, thereby extending the service life of the interior ceiling.

[0136] During the preparation of the PET fiber felt in Example 9, it was not treated with the citric acid solution. Compared with Example 3, both the peel strength and bending strength of Example 9 are lower than those of Example 3. This shows that after treating the PET fiber felt with the citric acid solution, it can not only remove the impurities on the surface of the PET fiber felt, increase the contact area between the fiber filaments and the polyurethane glue, but also increase the carboxyl content on the surface of the fiber filaments, further improving the bonding effect between the PET fiber felt and the polyurethane glue, thereby enhancing the adhesion stability of each layer and enabling the interior ceiling to have a longer service life.

[0137] In Example 10, during the preparation of the PET fiber felt, it was not treated with a polyethylene glycol ethanol solution. Compared with Example 3, the peel strength of Example 10 was lower than that of Example 3, and the flexural strength was lower than that of Example 3. This shows that after treating the PET fiber felt with a polyethylene glycol ethanol solution, the hydroxyl content on the surface of the fiber filaments can be further increased, the tight bonding between the PET fiber felt and the polyurethane glue can be improved, thereby increasing the peel strength and flexural strength, enabling better adhesion effects between the layers of the interior ceiling, and extending the service life of the interior ceiling.

[0138] 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 they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An environmentally friendly automobile interior ceiling, characterized in that: The interior ceiling comprises, from bottom to top, a base fabric, a rubber-coated PET fiber felt, a base fabric, an adhesive, and a surface decorative layer; the base fabric is any one of a non-woven fabric, a coated non-woven fabric, or a film-coated non-woven fabric; the rubber-coated PET fiber felt is made by coating polyurethane glue on both sides of the PET fiber felt; The PET fiber felt is mixed with 10%-20% by mass of low-melting point polyester fiber and 80%-90% by mass of conventional polyester fiber, and is subjected to opening, carding, web laying, hot pressing, qualitative, ironing, and slicing to obtain a PET fiber felt blank; the PET fiber felt blank is treated with a citric acid solution, drained, air-dried, then treated with a polyethylene glycol ethanol solution, and finally washed and dried; the polyethylene glycol ethanol solution is prepared from a 1% polyethylene glycol 1000 ethanol solution, cetearyl alcohol, and chitosan microspheres in a mass ratio of 1:0.1-0.15:0.05-0.1; the chitosan microspheres are prepared from chitosan microspheres loaded with fucoidan liquid in a mass ratio of 1:0.1-0.2; The polyurethane glue comprises the following raw materials in parts by weight: 30-50 parts of polyester polyol, 40-60 parts of polyether polyol, 0.2-0.8 parts of catalyst, 50-90 parts of isocyanate, 0.5-1 parts of cross-linking agent, 1-3 parts of flow promoter, 1-3 parts of styrene-butadiene rubber coated sodium alginate, 1-2 parts of shellac-loaded microcrystalline cellulose.

2. The environmentally friendly automobile interior ceiling according to claim 1, characterized in that: The styrene-butadiene rubber coated sodium alginate is prepared from styrene-butadiene rubber liquid and sodium alginate particles in a mass ratio of 1:0.5-1.

3. The environmentally friendly automobile interior ceiling according to claim 1, characterized in that: The shellac-loaded microcrystalline cellulose is prepared from a shellac-loaded polyvinyl alcohol solution and microcrystalline cellulose in a mass ratio of 1:0.5-1:1-1.

5.

4. The environmentally friendly automobile interior ceiling according to claim 1, characterized in that: The polyester polyol is one or more of 205U, 205UC, 210CP, and 220UA; the polyether polyol is one or more of DL-2000, 210, and 330N; the isocyanate is one or more of PM200, PM400, PM600, and M20S; and the catalyst is one or more of T12, T120, A33, DEOA, and TEOA.

5. The method for preparing an environmentally friendly automobile interior ceiling according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, evenly coating the upper and lower surfaces of the PET fiber felt with polyurethane glue to obtain a glue-coated PET fiber felt; S2. After spraying water evenly on the upper and lower surfaces of the coated PET fiber felt, the base fabric is attached, and then hot-pressed at a temperature of 100°C-140°C for 40-120s, and then cooled to obtain a semi-finished product; S3. Spray adhesive evenly on the upper surface of the semi-finished product, then lay the surface decoration layer, hot press at 90℃-120℃ for 20-100s, and after cooling, cut, hem and post-process to obtain the finished car roof.

6. The method for preparing an environmentally friendly automobile interior ceiling according to claim 5, characterized in that: The polyurethane glue is prepared by the following method: Heat the polyester polyol and the polyether polyol under negative pressure at 60-80°C and vacuum degree of 0.05-0.1MPa for 1-3h, then add isocyanate, catalyst, cross-linking agent, flow promoter, and react at 80-90°C for 1-4h, add styrene-butadiene rubber coated sodium alginate, shellac-loaded microcrystalline cellulose, and water at 80-85°C, mix and stir for 20-30min, and finally vacuum for 1-2h to obtain the finished polyurethane glue.

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