A preparation method of a flexible decorative film and its product

Abstract

The invention discloses a preparation method of a flexible decorative film and a product thereof. Wood pulp is made into wood fiber paper, which is then impregnated with an adhesive to obtain impregnated fiber paper; decorative base paper is first impregnated with urea-formaldehyde resin, and then modified amine-formaldehyde resin is coated on both sides to obtain impregnated decorative paper; impregnated decorative paper is laid on the impregnated fiber paper, and then hot-pressed to obtain a film, and a softener is sprayed to obtain the product. The invention improves the flexibility and strength of the impregnated fiber paper by increasing the proportion of bleached needle pulp, and performs flexibility modification on melamine resin, and hot-presses the combination of high-toughness and high-strength impregnated fiber paper and impregnated decorative paper with excellent flexibility. The finally prepared flexible decorative film has high flatness, good softness, and does not break when bent. The film can be used for coating special-shaped substrates and can be laminated with various substrates to form high-grade decorative panels. The invention has a simple production process and low cost, and can meet the personalized and diversified finishing effect requirements of customized furniture.

Description

Technical Field

[0001] The invention belongs to the technical field of decorative films, and in particular relates to a preparation method of a flexible decorative film and a product thereof. Background Art

[0002] Traditional plastic coating materials such as PVC and PP as the finishing of artificial boards have poor wear resistance, scratch resistance, weather resistance, heat resistance and other properties. The use of melamine impregnated paper laminated materials as the finishing of artificial boards can solve the above problems. It can also be laminated with various substrates to solve the problems of unstable board quality and poor physical and chemical properties. It is increasingly used in the covering and finishing of special-shaped furniture table tops and door panels, and is gradually favored by the market.

[0003] However, the cross-linked melamine resin molecules in melamine impregnated paper show obvious rigidity, and the resin has high hardness after curing. Therefore, conventional melamine impregnated paper can only be pressed onto flat board surfaces, countertops, etc., and is not suitable for special-shaped curved substrates. It is prone to chipping and cracking, and its application has certain limitations.

[0004] At present, the coating or facing of special-shaped substrates is mostly made of high-pressure laminates (HPL) in sheets or continuous pressed laminates (CPL) in rolls. However, at home and abroad, whether it is HPL produced by low temperature, high pressure and long cycle or CPL products produced by continuous pressing, due to the influence of their production equipment and production process, HPL and CPL can only be suitable for single model and large-scale product production, resulting in high product costs, making it difficult to meet the personalized and diversified finishing effect requirements of customized furniture. The popularization of the product is very slow, and the melamine impregnated paper pressing technology can just meet the needs of multi-variety, small-batch personalized customized products.

[0005] The applicant and the inventor have long been committed to the research and development and improvement in the field of melamine finishing, and have made great achievements in this regard, with multiple authorized invention patents. Based on the above analysis, the inventors have developed a flexible decorative film suitable for special-shaped substrates and a preparation method thereof based on melamine hot pressing technology and research and development improvements on various material properties and process parameters. Summary of the invention

[0006] In view of the problems in the related art, the present invention provides a method for preparing a flexible decorative film and a product thereof to overcome the above technical problems existing in the existing related art.

[0007] The technical solution of the present invention is achieved in this way:

[0008] A method for preparing a flexible decorative film and a product thereof, comprising the following steps:

[0009] (1) putting wood pulp into a pulping machine, adding water to dilute and beat the pulp, and then making a pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 45-55 parts by weight of bleached broadleaf pulp and 35-45 parts by weight of bleached needle pulp, and then making a pulp by an inclined wire paper machine and drying it for the first time to obtain wood fiber paper, and then impregnating it with an adhesive, the impregnation amount of which is 7-15%, and then drying it for the second time, calendering, and winding it to obtain an impregnated fiber paper;

[0010] (2) firstly immersing the decorative base paper in a urea-formaldehyde resin impregnation liquid, wherein the molar ratio of formaldehyde to urea in the urea-formaldehyde resin is 0.9 to 1.0, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.4 to 0.5:1, performing a first drying, and then coating the double sides with a modified amine-formaldehyde resin coating liquid, performing a second drying, cooling, and then cutting to obtain an impregnated decorative paper;

[0011] The modified amine-formaldehyde resin coating liquid comprises a modified amine-formaldehyde resin;

[0012] The modified amine-aldehyde resin comprises the following raw materials in parts by mass: 100 parts of melamine, 100 parts of formaldehyde, 15-20 parts of diethylene glycol, 15-20 parts of propylene glycol, 6-10 parts of tris(2-hydroxyethyl)isocyanurate, and 30-40 parts of water;

[0013] (3) laying a mirror template on a hot press, laying the impregnated decorative paper on the impregnated fiber paper, and then placing it on the mirror template for hot pressing to obtain a film;

[0014] (4) After the film obtained in step (3) is demoulded from the hot press, a softener is sprayed on the impregnated fiber paper surface of the film to obtain a flexible decorative film.

[0015] Firstly, the present invention improves the flexibility and strength of the impregnated fiber paper by increasing the proportion of bleached needle pulp, adding polymer additives and impregnating adhesives. Secondly, adding acrylic emulsion to urea-formaldehyde resin can not only improve the bonding performance but also improve the flexibility and tensile strength of the impregnated decorative paper. At the same time, the melamine resin is modified. Tris (2-hydroxyethyl) isocyanurate as a modifier has multiple active hydroxyl groups, which can react with hydroxymethyl, amino groups, etc. on melamine, and then added to the resin cross-linking system, thereby improving the adhesion and flexibility of the modified amine-formaldehyde resin coating liquid. The improvement of adhesion enables the impregnated decorative paper to be tightly compounded with the impregnated fiber paper, and the improvement of flexibility can reduce the hardness of the melamine resin after curing. The combination of diethylene glycol and propylene glycol can further enhance the flexibility of the impregnated decorative paper to achieve coating and bonding of special-shaped curved substrates.

[0016] Secondly, the present invention combines high-toughness, high-strength impregnated fiber paper with impregnated decorative paper with excellent flexibility by hot pressing, and sprays softener to further enhance the flexibility of the product. The finally obtained flexible decorative film has good softness, does not break when bent, is thin, light and has high flatness, can be rolled up for easy transportation, has excellent use characteristics, can be used for coating special-shaped substrates, and can be laminated with various substrates to form high-end decorative panels, so that the flexible decorative film has the product advantages of wide application range and strong product competitiveness.

[0017] Finally, the present invention has a simple production process and low cost, and can meet the personalized and diversified finishing effect requirements of customized furniture.

[0018] Preferably, in the step (1), the beating degree of the slurry is 18-20°SR, the slurry is added with a batching aid and stirred and mixed before being sent to the inclined wire paper machine;

[0019] The compounding auxiliary agent comprises the following raw materials in parts by weight: 10 to 20 parts of polyethylene terephthalate and 3 to 5 parts of auxiliary agents, wherein the auxiliary agents comprise cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:1. The addition of high polymer polyethylene terephthalate and auxiliary agents makes the fiber arrangement more regular and the combination more compact, thereby enhancing the bonding force between the fibers and making the impregnated fiber paper have higher strength.

[0020] Preferably, in step (1), the first drying temperature is 120-140° C., and the drying time is 2-6 seconds; the second drying temperature is 130-150° C., and the drying time is 3-5 seconds.

[0021] Preferably, the adhesive is a mixture of melamine and polyvinyl alcohol in a mass ratio of 1:2. The adhesive is designed to contain melamine and fully impregnate the wood fiber paper, which can make the impregnated fiber paper and the impregnated decorative paper more tightly compounded. Polyvinyl alcohol can enhance the toughness and strength of the impregnated fiber paper.

[0022] In step (1), the impregnated fiber paper has a porous three-dimensional structure, which ensures the permeability and structural strength of the wood fiber paper. The adhesive can fully penetrate into the wood fiber paper and is subsequently compounded with the impregnated decorative paper without being easily delaminated. At the same time, the main component of the wood fiber paper is the organic component wood pulp, which can also be better combined with the decorative paper impregnated with organic resin.

[0023] Specifically, the gram weight of the impregnated fiber paper is 35 to 55 g / m 2 If the weight is too high, it will easily delaminate, and if the weight is too low, the applicability will be poor; the moisture content is 2.0-3.0%, too high or too low moisture content will affect the later processing and use.

[0024] Preferably, in step (2), the modified amine-formaldehyde resin coating liquid comprises the following raw materials in parts by mass: 100 parts of modified amine-formaldehyde resin, 2-5 parts of polyethylene emulsion, 0.5-0.7 parts of curing agent, 0.1-0.3 parts of penetrant and 0.1-0.3 parts of release agent. The coating liquid composed of the modified amine-formaldehyde resin and polyethylene emulsion can further improve the flexibility of the impregnated decorative paper.

[0025] Preferably, in step (2), the first drying temperature is 110-130° C., and the drying time is 25-35 seconds; the second drying temperature is 100-110° C., and the drying time is 20-30 seconds.

[0026] Preferably, the weight of the impregnated decorative paper obtained in step (2) is 70 to 90 g / m 2 If the weight is too large, it will be easy to deform, and if the weight is too small, the covering power will be insufficient;

[0027] The impregnation amount of the impregnated decorative paper is 120-160%. If the impregnation amount is too low, the impregnated fiber paper and the impregnated decorative paper will not be firmly bonded. If the impregnation amount is too high, high pressure pasting will cause delamination and glue penetration. At the same time, the difference in the amount of glue on the front and back sides does not exceed 30%. If the difference in the amount of glue on the front and back sides is too large, it will cause deformation.

[0028] The volatile content of the impregnated decorative paper is 6-8%. If the volatile content is too low, the paper will turn white easily during pressing. If the volatile content is too high, the paper will bubble easily during pressing.

[0029] The estimated curing degree is 35-55%. If the pre-curing degree is too low, the pressing time needs to be extended, thereby reducing production efficiency. If the pre-curing degree is too high, pinholes are easily generated during pressing. The formaldehyde release amount is ≤0.5mg / L.

[0030] Preferably, in step (3), the hot pressing pressure is 10-20 MPa, the temperature is 170-190° C., and the pressing time is 10-20 seconds.

[0031] Specifically, the operation of step (3) is as follows: the steel template is boiled in boiling water for 24 hours and then cleaned, a release agent is coated on its surface, and then the heat conduction plate is installed on the hot press, and a copper pad, a felt cloth and a mirror template are laid on the lower heat conduction plate from bottom to top in sequence, and the thickness ratio of the copper pad, the felt cloth and the mirror template is 1:2:1. The glossiness of the mirror template is 600-750°, and the surface is flat and defect-free, so as to ensure that the film is smooth and flat after hot pressing and will not stick to the template.

[0032] Preferably, the softener contains the following raw materials in weight percentage: acetic acid 20-25%, glycerol 5-10%, diethylene glycol 5-10% and the rest is made up to 100% by pure water; the spraying amount of the softener is 10-20g / m 2 .

[0033] Specifically, the obtained flexible decorative film comprises a strong and tough layer and an impregnated decorative layer pressed on the surface of the strong and tough layer, with a thickness of 0.1 to 0.3 mm. The strong and tough layer is mainly the impregnated fiber paper obtained in step (1), and the impregnated decorative layer is mainly the impregnated decorative paper obtained in step (2). BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the product of the present invention.

[0035] Reference numerals:

[0036] 11. Strengthening layer; 12. Impregnation decorative layer. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The raw materials used in the examples and comparative examples are all commercially available conventional materials in the field of board materials.

[0039] Example 1

[0040] A method for preparing a flexible decorative film and a product thereof, comprising the following steps:

[0041] (1) putting wood pulp into a pulper, adding water to dilute and beat the pulp, and then making a pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 45 kg of bleached broadleaf pulp and 35 kg of bleached needle pulp, and adding a batching auxiliary agent to the pulp and stirring and mixing, wherein the batching auxiliary agent includes the following raw materials: 10 kg of polyethylene terephthalate and 3 kg of an auxiliary agent, wherein the auxiliary agent includes cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:1, and the beating degree of the pulp is 18°SR;

[0042] It is made by oblique wire paper machine and dried for the first time at a temperature of 120°C and a drying time of 2S;

[0043] Then, the adhesive is impregnated with 7% of the impregnation amount. The adhesive is a mixture of melamine and polyvinyl alcohol with a mass ratio of 1:2. The second drying is performed at a temperature of 130°C and a drying time of 3S. After calendering and winding, the impregnated fiber paper is obtained. The impregnated fiber paper has a porous three-dimensional structure and a gram weight of 35g / m 2 , moisture content 2.0%.

[0044] (2) firstly immersing the decorative base paper in a urea-formaldehyde resin impregnation solution, wherein the molar ratio F / U of formaldehyde to urea in the urea-formaldehyde resin is 0.9, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.4:1, and then performing a first drying at a temperature of 110° C. for a drying time of 25 seconds;

[0045] Then, a modified amine-formaldehyde resin coating liquid is applied on both sides, wherein the modified amine-formaldehyde resin coating liquid comprises the following raw materials: 100 kg of modified amine-formaldehyde resin, 2 kg of polyethylene emulsion, 0.5 kg of curing agent, 0.1 kg of penetrant and 0.1 kg of release agent;

[0046] The modified amine-aldehyde resin comprises the following raw materials in parts by mass: 100 parts of melamine, 100 parts of formaldehyde, 15 parts of diethylene glycol, 15 parts of propylene glycol, 6 parts of tris(2-hydroxyethyl)isocyanurate, and 30 parts of water;

[0047] The second drying was carried out at a temperature of 100°C for 20 seconds. After cooling, the impregnated decorative paper was cut to obtain a gram weight of 70 g / m 2 , impregnation amount 120%, volatile matter content 6%, estimated degree of chemistry 35%, formaldehyde release ≤0.5mg / L.

[0048] (3) The steel template is boiled in boiling water for 24 hours and then cleaned, and then a release agent is applied on its surface, and then installed on the heat conducting plate of the hot press. The lower heat conducting plate is laid with a copper pad, a felt cloth and a mirror template from bottom to top. The thickness ratio of the copper pad, the felt cloth and the mirror template is 1:2:1. The glossiness of the mirror template is 600°, and the surface is flat and defect-free;

[0049] The impregnated decorative paper is laid on the impregnated fiber paper, and then placed on the mirror template for hot pressing at a pressure of 10 MPa, a temperature of 170° C., and a pressing time of 20 seconds to obtain a film.

[0050] (4) After the film obtained in step (3) is demoulded from the hot press, a softener is sprayed on the impregnated fiber paper surface of the film, wherein the softener comprises the following raw materials: 20 kg of acetic acid, 5 kg of glycerol, 5 kg of diethylene glycol and 70 kg of purified water; the spraying amount of the softener is 10 g / m 2 , that is, a flexible decorative film is obtained;

[0051] The obtained flexible decorative film comprises a strong and tough layer and an impregnated decorative layer pressed on the surface of the strong and tough layer, with a thickness of 0.1 mm. The strong and tough layer is mainly the impregnated fiber paper obtained in step (1), and the impregnated decorative layer is mainly the impregnated decorative paper obtained in step (2).

[0052] Example 2

[0053] A method for preparing a flexible decorative film and a product thereof, comprising the following steps:

[0054] (1) putting wood pulp into a pulping machine, adding water to dilute and beat the pulp, and then making a pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 50 kg of bleached broadleaf pulp and 40 kg of bleached needle pulp, and the pulp is then added with a batching auxiliary and stirred and mixed, wherein the batching auxiliary includes the following raw materials: 15 kg of polyethylene terephthalate and 4 kg of an auxiliary, wherein the auxiliary includes cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:1, and the beating degree of the pulp is 19°SR;

[0055] It is made by oblique wire paper machine and dried for the first time at a temperature of 130°C and a drying time of 4 seconds;

[0056] Then, the adhesive is impregnated with an amount of 11%, wherein the adhesive is a mixture of melamine and polyvinyl alcohol, and the mass ratio of the two is 1:2. Then, the second drying is performed at a temperature of 140°C and a drying time of 4S. Then, the impregnated fiber paper is obtained after calendering and winding. The impregnated fiber paper has a porous three-dimensional structure and a gram weight of 45g / m 2 , moisture content 1.5%.

[0057] (2) firstly immersing the decorative base paper in a urea-formaldehyde resin impregnation solution, wherein the molar ratio of formaldehyde to urea in the urea-formaldehyde resin is 0.95, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.45:1, and then performing a first drying at a temperature of 120° C. for a drying time of 30 seconds;

[0058] Then, a modified amine-formaldehyde resin coating liquid is applied on both sides, wherein the modified amine-formaldehyde resin coating liquid comprises the following raw materials: 100 kg of modified amine-formaldehyde resin, 3.5 kg of polyethylene emulsion, 0.6 kg of curing agent, 0.2 kg of penetrant and 0.2 kg of release agent;

[0059] The modified amine-aldehyde resin comprises the following raw materials in parts by mass: 100 parts of melamine, 100 parts of formaldehyde, 18 parts of diethylene glycol, 18 parts of propylene glycol, 8 parts of tris(2-hydroxyethyl)isocyanurate, and 35 parts of water;

[0060] The second drying was carried out at a temperature of 105°C and a drying time of 25 seconds. After cooling, the impregnated decorative paper was cut to obtain a gram weight of 80 g / m 2 , impregnation volume 140%, volatile matter content 7%, estimated degree of chemistry 45%, formaldehyde release ≤0.5mg / L.

[0061] (3) The steel template is boiled in boiling water for 24 hours and then cleaned, and then a release agent is applied on its surface, and then installed on the heat conducting plate of the hot press. The lower heat conducting plate is laid with a copper pad, a felt cloth and a mirror template from bottom to top. The thickness ratio of the copper pad, the felt cloth and the mirror template is 1:2:1. The glossiness of the mirror template is 700°, and the surface is flat and defect-free;

[0062] The impregnated decorative paper is laid on the impregnated fiber paper, and then placed on the mirror template for hot pressing at a pressure of 15 MPa, a temperature of 180° C., and a pressing time of 15 seconds to obtain a film.

[0063] (4) After the film obtained in step (3) is demoulded from the hot press, a softener is sprayed on the impregnated fiber paper surface of the film. The softener comprises the following raw materials: 22.5 kg of acetic acid, 7.5 kg of glycerol, 7.5 kg of diethylene glycol and 62.5 kg of purified water; the spraying amount of the softener is 15 g / m 2 , that is, a flexible decorative film is obtained;

[0064] The obtained flexible decorative film comprises a strong and tough layer and an impregnated decorative layer pressed on the surface of the strong and tough layer, with a thickness of 0.2 mm. The strong and tough layer is mainly the impregnated fiber paper obtained in step (1), and the impregnated decorative layer is mainly the impregnated decorative paper obtained in step (2).

[0065] Example 3

[0066] A method for preparing a flexible decorative film and a product thereof, comprising the following steps:

[0067] (1) putting wood pulp into a pulping machine, adding water to dilute and beat the pulp, and then making a pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 55 kg of bleached broadleaf pulp and 45 kg of bleached needle pulp, and the pulp is added with a batching auxiliary and stirred and mixed, wherein the batching auxiliary includes the following raw materials in parts by weight: 20 kg of polyethylene terephthalate and 5 kg of an auxiliary, wherein the auxiliary includes cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:1, and the beating degree of the pulp is 20°SR;

[0068] It is made by oblique wire paper machine and dried for the first time at a temperature of 140°C and a drying time of 6 seconds;

[0069] Then, the adhesive is impregnated with 15% of the impregnation amount. The adhesive is a mixture of melamine and polyvinyl alcohol with a mass ratio of 1:2. The second drying is performed at a temperature of 150°C and a drying time of 5S. After calendering and winding, the impregnated fiber paper is obtained. The impregnated fiber paper has a porous three-dimensional structure and a gram weight of 55g / m 2 , moisture content 3.0%.

[0070] (2) firstly immersing the decorative base paper in a urea-formaldehyde resin impregnation solution, wherein the molar ratio F / U of formaldehyde to urea in the urea-formaldehyde resin is 1.0, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.5:1, and then performing a first drying at a temperature of 130° C. for a drying time of 35 seconds;

[0071] Then, a modified amine-formaldehyde resin coating liquid is applied on both sides, wherein the modified amine-formaldehyde resin coating liquid comprises the following raw materials: 100 kg of modified amine-formaldehyde resin, 5 kg of polyethylene emulsion, 0.7 kg of curing agent, 0.3 kg of penetrant and 0.3 kg of release agent;

[0072] The modified amine-aldehyde resin comprises the following raw materials in parts by weight: 100 parts of melamine, 100 parts of formaldehyde, 20 parts of diethylene glycol, 20 parts of propylene glycol, 10 parts of tris(2-hydroxyethyl)isocyanurate, and 40 parts of water;

[0073] The second drying was carried out at a temperature of 110°C for 30 seconds. After cooling, the impregnated decorative paper was cut to obtain a gram weight of 90g / m 2 , impregnation volume 160%, volatile matter content 8%, estimated degree of chemistry 55%, formaldehyde release ≤0.5mg / L.

[0074] (3) The steel template is boiled in boiling water for 24 hours and then cleaned. A release agent is then applied on the surface of the steel template. The steel template is then installed on a heat conducting plate on a hot press. A copper pad, a felt cloth and a mirror template are laid on the lower heat conducting plate from bottom to top. The thickness ratio of the copper pad, the felt cloth and the mirror template is 1:2:1. The glossiness of the mirror template is 750°, and the surface is flat and has no defects.

[0075] The impregnated decorative paper is laid on the impregnated fiber paper, and then placed on the mirror template for hot pressing at a pressure of 20 MPa, a temperature of 190° C., and a pressing time of 10 seconds to obtain a film.

[0076] (4) After the film obtained in step (3) is demoulded from the hot press, a softener is sprayed on the impregnated fiber paper surface of the film. The softener comprises the following raw materials: 25 kg of acetic acid, 10 kg of glycerol, 10 kg of diethylene glycol and 55 kg of purified water; the spraying amount of the softener is 20 g / m 2 , that is, a flexible decorative film is obtained;

[0077] The obtained flexible decorative film comprises a strong and tough layer and an impregnated decorative layer pressed on the surface of the strong and tough layer, with a thickness of 0.3 mm. The strong and tough layer is mainly the impregnated fiber paper obtained in step (1), and the impregnated decorative layer is mainly the impregnated decorative paper obtained in step (2).

[0078] Comparative Example 1

[0079] Commercially available CPL with the same thickness as Example 2.

[0080] Comparative Example 2

[0081] The preparation method of this comparative example comprises the following steps:

[0082] (1) putting wood pulp into a pulping machine, adding water to dilute and beat the pulp, and then making a pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 50 kg of bleached broadleaf pulp and 40 kg of bleached needle pulp, and the pulp is then added with a batching auxiliary and stirred and mixed, wherein the batching auxiliary includes the following raw materials: 15 kg of polyethylene terephthalate and 4 kg of an auxiliary, wherein the auxiliary includes cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:1, and the beating degree of the pulp is 19°SR;

[0083] It is made by oblique wire paper machine and dried for the first time at a temperature of 130°C and a drying time of 4 seconds;

[0084] Then, the adhesive is impregnated with an amount of 11%, wherein the adhesive is a mixture of melamine and polyvinyl alcohol, and the mass ratio of the two is 1:2. Then, the second drying is performed at a temperature of 140°C and a drying time of 4S. Then, the impregnated fiber paper is obtained after calendering and winding. The impregnated fiber paper has a porous three-dimensional structure and a gram weight of 45g / m 2 , moisture content 1.5%.

[0085] (2) firstly immersing the decorative base paper in a urea-formaldehyde resin impregnation solution, wherein the molar ratio of formaldehyde to urea in the urea-formaldehyde resin is 0.95, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.45:1, and then performing a first drying at a temperature of 120° C. for a drying time of 30 seconds;

[0086] Then, a modified amine-formaldehyde resin coating liquid is applied on both sides, wherein the modified amine-formaldehyde resin coating liquid comprises the following raw materials: 100 kg of modified amine-formaldehyde resin, 3.5 kg of polyethylene emulsion, 0.6 kg of curing agent, 0.2 kg of penetrant and 0.2 kg of release agent;

[0087] The modified amine-aldehyde resin comprises the following raw materials in parts by mass: 100 parts of melamine, 100 parts of formaldehyde, 18 parts of diethylene glycol, 18 parts of propylene glycol, 8 parts of tris(2-hydroxyethyl)isocyanurate, and 35 parts of water;

[0088] The second drying was carried out at a temperature of 105°C and a drying time of 25 seconds. After cooling, the impregnated decorative paper was cut to obtain a gram weight of 80 g / m 2 , impregnation volume 140%, volatile matter content 7%, estimated degree of chemistry 45%, formaldehyde release ≤0.5mg / L.

[0089] (3) The steel template is boiled in boiling water for 24 hours and then cleaned, and then a release agent is applied on its surface, and then installed on the heat conducting plate of the hot press. The lower heat conducting plate is laid with a copper pad, a felt cloth and a mirror template from bottom to top. The thickness ratio of the copper pad, the felt cloth and the mirror template is 1:2:1. The glossiness of the mirror template is 700°, and the surface is flat and defect-free;

[0090] The impregnated decorative paper is laid on the impregnated fiber paper, and then placed on the mirror template for hot pressing at a pressure of 15 MPa, a temperature of 180° C., and a pressing time of 15 seconds to obtain a film.

[0091] (4) After the film obtained in step (3) is demoulded from the hot press, the comparative example is obtained.

[0092] Comparative Example 3

[0093] The preparation method of this comparative example comprises the following steps:

[0094] (1) putting wood pulp into a pulping machine, adding water to dilute and beat the pulp, and then making a pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 50 kg of bleached broadleaf pulp and 40 kg of bleached needle pulp, and the pulp is then added with a batching auxiliary and stirred and mixed, wherein the batching auxiliary includes the following raw materials: 15 kg of polyethylene terephthalate and 4 kg of an auxiliary, wherein the auxiliary includes cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:1, and the beating degree of the pulp is 19°SR;

[0095] It is made by oblique wire paper machine and dried for the first time at a temperature of 130°C and a drying time of 4 seconds;

[0096] Then, the adhesive is impregnated with an amount of 11%, wherein the adhesive is a mixture of melamine and polyvinyl alcohol, and the mass ratio of the two is 1:2. Then, the second drying is performed at a temperature of 140°C and a drying time of 4S. Then, the impregnated fiber paper is obtained after calendering and winding. The impregnated fiber paper has a porous three-dimensional structure and a gram weight of 45g / m 2 , moisture content 1.5%.

[0097] (2) firstly immersing the decorative base paper in a urea-formaldehyde resin impregnation solution, wherein the molar ratio of formaldehyde to urea in the urea-formaldehyde resin is 0.95, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.45:1, and then performing a first drying at a temperature of 120° C. for a drying time of 30 seconds;

[0098] Then, a modified amine-formaldehyde resin coating liquid is applied on both sides, wherein the modified amine-formaldehyde resin coating liquid comprises the following raw materials: 100 kg of modified amine-formaldehyde resin, 3.5 kg of polyethylene emulsion, 0.6 kg of curing agent, 0.2 kg of penetrant and 0.2 kg of release agent;

[0099] The modified amine-aldehyde resin comprises the following raw materials in parts by weight: 100 parts of melamine, 100 parts of formaldehyde, 18 parts of diethylene glycol, 18 parts of propylene glycol, and 35 parts of water;

[0100] The second drying was carried out at a temperature of 105°C and a drying time of 25 seconds. After cooling, the impregnated decorative paper was cut to obtain a gram weight of 80 g / m 2, impregnation volume 140%, volatile matter content 7%, estimated degree of chemistry 45%, formaldehyde release ≤0.5mg / L.

[0101] (3) The steel template is boiled in boiling water for 24 hours and then cleaned, and then a release agent is applied on its surface, and then installed on the heat conducting plate of the hot press. The lower heat conducting plate is laid with a copper pad, a felt cloth and a mirror template from bottom to top. The thickness ratio of the copper pad, the felt cloth and the mirror template is 1:2:1. The glossiness of the mirror template is 700°, and the surface is flat and defect-free;

[0102] The impregnated decorative paper is laid on the impregnated fiber paper, and then placed on the mirror template for hot pressing at a pressure of 15 MPa, a temperature of 180° C., and a pressing time of 15 seconds to obtain a film.

[0103] (4) After the film obtained in step (3) is demoulded from the hot press, a softener is sprayed on the impregnated fiber paper surface of the film. The softener comprises the following raw materials: 22.5 kg of acetic acid, 7.5 kg of glycerol, 7.5 kg of diethylene glycol and 62.5 kg of purified water; the spraying amount of the softener is 15 g / m 2 , that is, to obtain this comparative example.

[0104] Comparative Example 4

[0105] The preparation method of this comparative example comprises the following steps:

[0106] (1) putting wood pulp into a pulping machine, adding water to dilute and beat the pulp, and then making a pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 50 kg of bleached broadleaf pulp and 40 kg of bleached needle pulp, and the pulp is then added with a batching auxiliary and stirred and mixed, wherein the batching auxiliary includes the following raw materials: 15 kg of polyethylene terephthalate and 4 kg of an auxiliary, wherein the auxiliary includes cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:1, and the beating degree of the pulp is 19°SR;

[0107] It is made by oblique wire paper machine and dried for the first time at a temperature of 130°C and a drying time of 4 seconds;

[0108] Then, the paper is impregnated with adhesive at an amount of 11%, wherein the adhesive is polyvinyl alcohol, and then dried for a second time at a temperature of 140°C for a drying time of 4 seconds. Then, the impregnated fiber paper is obtained after calendering and winding. The impregnated fiber paper has a porous three-dimensional structure and a gram weight of 45 g / m 2 , moisture content 1.5%.

[0109] (2) firstly immersing the decorative base paper in a urea-formaldehyde resin impregnation solution, wherein the molar ratio of formaldehyde to urea in the urea-formaldehyde resin is 0.95, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.45:1, and then performing a first drying at a temperature of 120° C. for a drying time of 30 seconds;

[0110] Then, a modified amine-formaldehyde resin coating liquid is applied on both sides, wherein the modified amine-formaldehyde resin coating liquid comprises the following raw materials: 100 kg of modified amine-formaldehyde resin, 3.5 kg of polyethylene emulsion, 0.6 kg of curing agent, 0.2 kg of penetrant and 0.2 kg of release agent;

[0111] The modified amine-aldehyde resin comprises the following raw materials in parts by mass: 100 parts of melamine, 100 parts of formaldehyde, 18 parts of diethylene glycol, 18 parts of propylene glycol, 8 parts of tris(2-hydroxyethyl)isocyanurate, and 35 parts of water;

[0112] The second drying was carried out at a temperature of 105°C and a drying time of 25 seconds. After cooling, the impregnated decorative paper was cut to obtain a gram weight of 80 g / m 2 , impregnation volume 140%, volatile matter content 7%, estimated degree of chemistry 45%, formaldehyde release ≤0.5mg / L.

[0113] (3) The steel template is boiled in boiling water for 24 hours and then cleaned, and then a release agent is applied on its surface, and then installed on the heat conducting plate of the hot press. The lower heat conducting plate is laid with a copper pad, a felt cloth and a mirror template from bottom to top. The thickness ratio of the copper pad, the felt cloth and the mirror template is 1:2:1. The glossiness of the mirror template is 700°, and the surface is flat and defect-free;

[0114] The impregnated decorative paper is laid on the impregnated fiber paper, and then placed on the mirror template for hot pressing at a pressure of 15 MPa, a temperature of 180° C., and a pressing time of 15 seconds to obtain a film.

[0115] (4) After the film obtained in step (3) is demoulded from the hot press, a softener is sprayed on the impregnated fiber paper surface of the film. The softener comprises the following raw materials: 22.5 kg of acetic acid, 7.5 kg of glycerol, 7.5 kg of diethylene glycol and 62.5 kg of purified water; the spraying amount of the softener is 15 g / m 2 , a flexible decorative film is obtained.

[0116] Performance Testing

[0117]

[0118] As can be seen from the above table, the formability, wear resistance, scratch resistance, weather resistance and environmental protection of the flexible decorative film produced by the present invention are better than those of the decorative films on the market, and it has excellent use characteristics and can be widely used in various decorative places. Therefore, the flexible decorative film provided by the present invention is particularly suitable for wide promotion and application. From the test results of Comparative Examples 2, 3 and 4, it can be seen that not spraying a softener, not using a modifier tris (2-hydroxyethyl) isocyanurate and not containing melamine in the fiber paper impregnation adhesive will have different degrees of influence on the performance of the final product, resulting in it being unable to meet the use requirements.

[0119] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A method for preparing a flexible decorative film, characterized in that: The steps include: (1) putting wood pulp into a pulping machine, adding water to dilute and beat the pulp, and then making pulp by high-speed rotation and friction of a grinding plate, wherein the wood pulp includes 45-55 parts by weight of bleached broadleaf pulp and 35-45 parts by weight of bleached needle pulp, and then making pulp by an inclined wire paper machine and drying it for the first time to obtain wood fiber paper, and then impregnating it with an adhesive, and then drying it for the second time, calendering, and winding it to obtain impregnated fiber paper; The adhesive is a mixture of melamine and polyvinyl alcohol; (2) The decorative base paper is first impregnated with a urea-formaldehyde resin impregnation liquid, dried for the first time, then coated on both sides with a modified amine-formaldehyde resin coating liquid, dried for a second time, cooled, and then cut to obtain an impregnated decorative paper, wherein the impregnation amount of the impregnated decorative paper is 120-160% and the difference in the amount of glue on the front and back sides does not exceed 30%; The molar ratio F / U of formaldehyde to urea in the urea-formaldehyde resin is 0.9-1.0, and the mass ratio of acrylic emulsion to urea in the urea-formaldehyde resin is 0.4-0.5:1; The modified amine-formaldehyde resin coating liquid comprises a modified amine-formaldehyde resin; The modified amine-aldehyde resin comprises the following raw materials in parts by mass: 100 parts of melamine, 100 parts of formaldehyde, 15-20 parts of diethylene glycol, 15-20 parts of propylene glycol, 6-10 parts of tris(2-hydroxyethyl)isocyanurate, and 30-40 parts of water; (3) laying a mirror template on a hot press, laying the impregnated decorative paper on the impregnated fiber paper, and then placing it on the mirror template for hot pressing to obtain a film; The hot pressing pressure is 10-20 MPa, the temperature is 170-190°C, and the pressing time is 10-20S; (4) after demoulding the film obtained in step (3) from the hot press, spraying a softener on the impregnated fiber paper surface of the film, thereby obtaining a flexible decorative film; The softener contains the following raw materials in percentage by weight: acetic acid 20-25%, glycerol 5-10%, diethylene glycol 5-10% and the rest is made up to 100% by pure water; the spraying amount of the softener is 10-20g / m 2 .

2. The method for preparing the flexible decorative film according to claim 1, characterized in that: In the step (1), the beating degree of the slurry is 18-20°SR, the slurry is added with a batching aid and stirred and mixed before being sent to the inclined wire paper machine; The compounding auxiliary comprises the following raw materials in parts by weight: 10 to 20 parts of polyethylene terephthalate and 3 to 5 parts of auxiliary agents, wherein the auxiliary agents comprise cationic starch and polyamide epichlorohydrin resin, and the mass ratio of the two is 1:

1.

3. The method for preparing the flexible decorative film according to claim 1 or 2, characterized in that: In the step (1), the temperature of the first drying is 120-140° C., and the drying time is 2-6 seconds; The second drying temperature is 130-150° C., and the drying time is 3-5 seconds.

4. The method for preparing the flexible decorative film according to claim 3, characterized in that: In step (1), the impregnated fiber paper is a porous three-dimensional structure with a gram weight of 35 to 55 g / m 2 , moisture content 2.0~3.0%.

5. The method for preparing a flexible decorative film according to claim 1, characterized in that: In the step (2), the modified amine-formaldehyde resin coating liquid comprises the following raw materials in parts by weight: 100 parts of modified amine-formaldehyde resin, 2 to 5 parts of polyethylene emulsion, 0.5 to 0.7 parts of curing agent, 0.1 to 0.3 parts of penetrant, and 0.1 to 0.3 parts of release agent.

6. The method for preparing a flexible decorative film according to claim 1, characterized in that: In step (2), the first drying temperature is 110-130° C., and the drying time is 25-35 seconds; The second drying temperature is 100-110° C., and the drying time is 20-30 seconds.

7. The method for preparing the flexible decorative film according to claim 6, characterized in that: The weight of the impregnated decorative paper obtained in step (2) is 70 to 90 g / m 2 ; The impregnated decorative paper has a volatile matter content of 6-8%, an estimated degree of chemistry of 35-55%, and a formaldehyde release of ≤0.5 mg / L.

8. The method for preparing a flexible decorative film according to claim 1, characterized in that: The prepared flexible decorative film comprises a strong and tough layer and an impregnated decorative layer pressed on the surface of the strong and tough layer, and has a thickness of 0.1 to 0.3 mm.

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