Glue-free PET composite PVC film and preparation method thereof

Abstract

The invention discloses a glue-free PET (Polyethylene Terephthalate) composite PVC (Polyvinyl Chloride) film and a preparation method thereof. The glue-free PET composite PVC film is prepared from the following components in parts by mass: 100 parts of PVC resin, 16 to 50 parts of plasticizer, 2 to 8 parts of stabilizer, 0.5 to 2 parts of processing aid, 0.5 to 2 parts of anti-ultraviolet agent and 2 to 10 parts of anti-impact modifier. According to the adhesive-free PET composite PVC film and the preparation method thereof provided by the invention, the polyester plasticizer with high molecular weight is adopted, and the anti-ultraviolet agent is compounded and added, so that the weather resistance and the ultraviolet resistance of the PVC film can be improved; and the acrylate impact modifier is adopted, so that the processability of the product and the toughness of the finished product can be improved. The PET is directly compounded in the PVC calendering production process, so that the double-sided highlight effect of the PVC film is realized, the transparency of the product is high, and the extinction problem in the industry is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical materials and relates to a PVC film, in particular to a non-adhesive PET composite PVC film and a preparation method thereof. Background Art

[0002] With the continued vigorous development of industries such as advertising, decoration, photography, and calligraphy and painting, the demand for PVC laminating films has shown a steady growth trend. There are obvious differences in the growth of different types of laminating films in the market. Among them, the market demand for high-end cold laminating film products with higher transparency, better weather resistance and scratch resistance is growing rapidly. Ordinary laminating film products have a relatively stable growth trend due to fierce market competition.

[0003] At present, the most widely used mounting films in the market are glossy films and matte films. However, in the field of glossy films, there are some problems that need to be solved urgently. First, the problem of large shrinkage is more prominent, which makes it difficult for downstream customers to ensure the stability of product size during the production process, thereby increasing the defect rate. Secondly, the defect of low transparency affects the visual effect of the product and reduces its application value in advertising, photography and other fields. Furthermore, the core matte is serious, which not only leads to a decline in product appearance quality, but also requires downstream customers to invest more resources to deal with defective products during the production process, resulting in great waste.

[0004] The conventional solutions in the industry are mainly the following: (1) By adjusting the stretching ratio of the calendering process and the process parameters of the winding process, the shrinkage and matting problems can be alleviated. However, the effect of this method is limited and the requirements for the production process are relatively high. (2) After the production is completed, the product needs to be immediately placed in a cold storage and transported through a cold chain to slow down the occurrence of shrinkage and matting. However, this method increases transportation and storage costs and does not fundamentally solve the problem. (3) The downstream industry performs a gloss-reflecting treatment on the product during the processing, but the fundamental reason for the matting is that the PVC film produced is one glossy and one matte. During the winding process, the stress in the core is relatively large, and the glossy and matte surfaces come into contact with each other, causing matting during packaging, storage, and transportation. In addition, the gloss-reflecting treatment of the downstream industry cannot make the product reach its original brightness. Therefore, the industry has not been able to completely solve the matting problem.

[0005] In view of this, there is an urgent need to design a new PVC film so as to overcome at least part of the above-mentioned defects of the existing PVC film. Summary of the invention

[0006] The invention provides a non-adhesive PET composite PVC film and a preparation method thereof, which can improve the weather resistance and ultraviolet light resistance of the PVC film.

[0007] To solve the above technical problem, according to one aspect of the present invention, the following technical solution is adopted:

[0008] A non-glue PET composite PVC film comprises: 100 parts by weight of PVC resin, 16 to 50 parts by weight of a plasticizer, 2 to 8 parts by weight of a stabilizer, 0.5 to 2 parts by weight of a processing aid, 0.5 to 2 parts by weight of an anti-ultraviolet agent and 2 to 10 parts by weight of an impact modifier.

[0009] As an embodiment of the present invention, the adhesive-free PET composite PVC film further comprises a PVC brightener. As an embodiment of the present invention, the PVC brightener is silicone powder.

[0010] As an embodiment of the present invention, the plasticizer is a polyester plasticizer with a molecular weight between 1500 and 6000, which has better oil resistance, volatility resistance and weather resistance. The use of high molecular weight polyester plasticizer and the addition of anti-ultraviolet agent significantly improves the outdoor weather resistance of the material and ensures that the material can be used outdoors for a long time.

[0011] As an embodiment of the present invention, the anti-ultraviolet agent includes 2 parts by weight of an ultraviolet absorber and 0.5 to 2 parts by weight of a hindered amine light stabilizer.

[0012] As an embodiment of the present invention, the impact-resistant agent is an acrylate modifier.

[0013] According to another aspect of the present invention, the following technical scheme is adopted: a method for preparing a non-adhesive PET composite PVC film, the preparation method comprising:

[0014] Step S1, placing the PET film on a laminating frame;

[0015] Step S2, adding PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier and processing aid into a high-speed mixer according to a set ratio, stirring, and then cooling to room temperature to obtain a premix;

[0016] Step S3, plasticizing and filtering the obtained premix;

[0017] Step S4, rolling the material processed in step S3 into a film, drawing it out through a take-up wheel, and then laminating the PET film and the PVC film;

[0018] Step S5, cooling, trimming and rolling the material processed in step S4 to obtain a non-adhesive PET composite PVC film.

[0019] As an embodiment of the present invention, the mass fractions of the PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier and processing aid are as follows:

[0020] The mass part of PVC resin is 100 parts, the mass part of plasticizer is 16-50 parts, the mass part of stabilizer is 2-8 parts, the mass part of processing aid is 0.5-2 parts, the mass part of anti-ultraviolet agent is 0.5-2 parts, and the mass part of impact modifier is 2-10 parts.

[0021] As an embodiment of the present invention, the thickness of the PET film is between 20 μm and 80 μm, and the surface glossiness is greater than or equal to 100 g.u.

[0022] As an embodiment of the present invention, the online lamination is to convey the PET film to the front section of embossing by a guide wheel to complete the lamination with PVC.

[0023] As an embodiment of the present invention, in the step S2, the raw materials added to the mixer further include PVC brightener, and the PVC brightener is silicone powder.

[0024] As an embodiment of the present invention, the five-roll calendering temperature is between 160°C and 200°C, the five-roller speed is 5 to 60 m / min, and the draw ratio between the take-up wheel and the embossing wheel is 1.2 to 1.8;

[0025] The embossing roller is a mirror roller with a temperature between 5°C and 30°C, the rubber roller is 600 mesh and the temperature is between 20°C and 40°C; the speed ratio of the embossing roller to the rubber roller is controlled between 1:0.6 and 1.2; the embossing pressure is between 40 and 70N, and the PET unwinding tension is between 6 and 30.

[0026] As an embodiment of the present invention, in step S3, the obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0027] In step S4, the material processed in step S3 is calendered into a film by a five-roll calender, drawn out by a take-up wheel, and then the PET and PVC films are bonded by an embossing roller and a rubber roller.

[0028] The beneficial effects of the present invention are as follows: the glue-free PET composite PVC film and the preparation method thereof proposed by the present invention adopt a high molecular weight polyester plasticizer and a composite anti-ultraviolet agent to improve the weather resistance and ultraviolet light resistance of the PVC film; adopt an acrylic ester impact modifier to improve the processing performance of the product and the toughness of the finished product; adopt a PVC brightener to improve the production and processing fluidity, improve surface problems, and improve the surface gloss of the PVC film.

[0029] Through the production process of the present invention, PET and PVC are compounded, and the PET film plays a protective role and fits tightly with PVC to reduce shrinkage. Since PET is a bright and high-gloss product, after compounding the PVC film, both contact surfaces of the PVC film are bright, which successfully solves the problem of the core extinction. Even in conventional storage environments, extinction will not occur. In addition, this compounding method further improves the glossiness of the product surface, achieves double-sided high gloss, and makes the product have higher transparency. During use, customers only need to peel off the PET film and use it directly without performing light-reflecting treatment on the product. By compounding a layer of protective film, the convenience of use is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flowchart of a method for preparing a non-adhesive PET composite PVC film according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0033] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced within the scope of the present invention.

[0034] Unless otherwise indicated, implied from the context, or customary in the prior art, all parts and percentages in this application are based on weight, and the test and characterization methods used are all current as of the filing date of this application. Where applicable, the contents of any patent, patent application or publication referred to in this application are fully incorporated herein by reference, and their equivalent patent families are also incorporated by reference, especially the definitions of synthesis techniques, product and processing designs, polymers, comonomers, initiators or catalysts disclosed in these documents in the art. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in this application, the definition of the term provided in this application shall prevail.

[0035] Numerical ranges in this application are approximate values, so unless otherwise specified, they may include numerical values ​​outside the range. Numerical ranges include all numerical values ​​from the lower limit to the upper limit increased by 1 unit, provided that there is an interval of at least 2 units between any lower value and any higher value. For example, if the recorded component, physical or other properties (such as molecular weight, melt index, etc.) are 100 to 1000, it means that all single values ​​are clearly listed, such as 100, 101, 102, etc., and all sub-ranges, such as 100 to 166, 155 to 170, 198 to 200, etc. For a range containing a numerical value less than 1 or containing a fraction greater than 1 (such as 1.1, 1.5, etc.), 1 unit is appropriately regarded as 0.0001, 0.001, 0.01 or 0.1. For a range containing a single digit less than 10 (such as 1 to 5), 1 unit is usually regarded as 0.1. These are only specific examples of what is intended to be expressed, and all possible combinations of values ​​between the lowest and highest values ​​listed are considered to be clearly recorded in this application. It should also be noted that the terms "first", "second", etc. in this article do not limit the order of precedence, but are only used to distinguish substances with different structures.

[0036] When used with respect to chemical compounds, unless expressly specified otherwise, the singular includes all isomeric forms and vice versa (e.g., "hexane" includes all isomers of hexane, individually or collectively). In addition, nouns using "a," "an," or "the" also include their plural forms unless expressly specified otherwise.

[0037] The terms "comprising", "including", "having" and their derivatives do not exclude the presence of any other components, steps or processes, and are irrelevant to whether these other components, steps or processes are disclosed in this application. To eliminate any doubt, unless explicitly stated, all compositions using the terms "comprising", "including", or "having" in this application may include any additional additives, adjuvants or compounds. On the contrary, except for those necessary for operating performance, the term "essentially consisting of..." excludes any other components, steps or processes from the scope of any description of the term below. The term "consisting of..." does not include any components, steps or processes that are not specifically described or listed. Unless explicitly stated, the term "or" refers to the listed individual members or any combination thereof.

[0038] The description of the steps in each embodiment in the specification is only for the convenience of explanation, and the implementation method of the present application is not limited by the order of implementation of the steps.

[0039] The invention discloses a non-glue PET composite PVC film, which comprises: 100 parts by weight of PVC resin, 16 to 50 parts by weight of a plasticizer, 2 to 8 parts by weight of a stabilizer, 0.5 to 2 parts by weight of a processing aid, 0.5 to 2 parts by weight of an anti-ultraviolet agent and 2 to 10 parts by weight of an impact modifier.

[0040] In one embodiment of the present invention, the adhesive-free PET composite PVC film may further include a PVC brightener; the PVC brightener may be silicone powder. Adding the PVC brightener can further improve the surface quality of the PVC film and increase the surface gloss.

[0041] The plasticizer can be a polyester plasticizer with a molecular weight between 1500 and 6000, which has better oil resistance, volatility resistance and weather resistance. The use of high molecular weight polyester plasticizer and the addition of anti-ultraviolet agent significantly improves the outdoor weather resistance of the material and ensures that the material can be used outdoors for a long time.

[0042] The anti-ultraviolet agent may include 2 parts by weight of an ultraviolet absorber and 0.5 to 2 parts by weight of a hindered amine light stabilizer. The anti-impact agent may be an acrylate modifier.

[0043] The present invention further discloses a method for preparing a non-adhesive PET composite PVC film. Figure 1 This is a flow chart of a method for preparing a non-adhesive PET composite PVC film according to an embodiment of the present invention; please refer to Figure 1 , the preparation method comprises:

[0044] [Step S1] Placing the PET film on a laminating frame;

[0045] The PET film can be purchased from the market. The thickness of the PET film can be between 20 μm and 80 μm, and the surface glossiness is greater than or equal to 100 g.u.

[0046] [Step S2] Add PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier and processing aid into a high-speed mixer according to a set ratio, stir, and then cool to room temperature to obtain a premix. In one embodiment, the raw materials added to the mixer also include PVC brightener; the PVC brightener can be silicone powder.

[0047] In one embodiment of the present invention, the mass parts of the PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier and processing aid are as follows: the mass part of PVC resin is 100 parts, the mass part of plasticizer is 16-50 parts, the mass part of stabilizer is 2-8 parts, the mass part of processing aid is 0.5-2 parts, the mass part of anti-ultraviolet agent is 0.5-2 parts, and the mass part of impact modifier is 2-10 parts.

[0048] [Step S3] The obtained premix is ​​plasticized and filtered. In one embodiment, the obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter.

[0049] [Step S4] The material processed in step S3 is rolled into a thin film, drawn out by a take-up wheel, and then the PET film and the PVC film are laminated. In one embodiment, the material processed in step S3 is rolled into a thin film by a five-roll calender, drawn out by a take-up wheel, and then the PET film and the PVC film are laminated by an embossing roller and a rubber roller.

[0050] The lamination can be completed by conveying the PET film to the front section of embossing through a guide wheel to complete the lamination with the PVC.

[0051] The five-roll calendering temperature is between 160°C and 200°C, the five-roll speed is 5 to 60 m / min, and the stretching ratio between the take-up wheel and the embossing wheel is 1.2 to 1.8; the embossing roller is a mirror roller with a temperature between 5°C and 30°C, the rubber roller is 600 mesh and the temperature is between 20°C and 40°C; the speed ratio between the embossing roller and the rubber roller is controlled between 1:0.6 and 1.2; the embossing pressure is between 40 and 70N, and the PET unwinding tension is between 6 and 30.

[0052] [Step S5] The material processed in step S4 is cooled, trimmed and rolled to obtain a non-glue PET composite PVC film.

[0053] Example 1

[0054] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 26 parts by weight of plasticizer, 5 parts by weight of stabilizer, 1 part by weight of processing aid, 1 part by weight of anti-ultraviolet agent, and 4 parts by weight of impact modifier.

[0055] In this embodiment, the method for preparing the adhesive-free PET composite PVC film of the present invention comprises the following steps:

[0056] The PET film is placed on a laminating frame. The thickness of the PET film is 20 μm and the surface glossiness is 120 g.u.

[0057] Add PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier and processing aid into a high-speed mixer according to the proportion, stir, and then cool to room temperature to obtain a premix;

[0058] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0059] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and the PET and PVC films are bonded by an embossing roller and a rubber roller.

[0060] The film is cooled, trimmed and rolled to obtain the adhesive-free PET composite PVC film.

[0061] The calendering temperature is controlled at 190℃ for wheel 1#, 190℃ for wheel 2#, 195℃ for wheel 3#, 183℃ for wheel 4# and 183℃ for wheel 5#. The speed of the five rollers is 8m / min for wheel 1#, 22m / min for wheel 2#, 29m / min for wheel 3#, 38m / min for wheel 4# and 42m / min for wheel 5#. The stretching ratio between the take-up wheel and the embossing wheel is 1.4. The embossing roller is a mirror roller. The temperature is controlled between 5℃ and 15℃. The temperature of the rubber wheel is controlled between 20℃ and 30℃. The speed ratio between the embossing wheel and the rubber wheel is controlled at 1:0.9. The embossing pressure is 50N and the PET unwinding tension is 8N.

[0062] Example 2

[0063] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 30 parts by weight of plasticizer, 6 parts by weight of stabilizer, 1.5 parts by weight of processing aid, 1.2 parts by weight of anti-ultraviolet agent, and 6 parts by weight of impact modifier.

[0064] In this embodiment, the method for preparing the adhesive-free PET composite PVC film of the present invention comprises the following steps:

[0065] The PET film is placed on a laminating frame. The thickness of the PET film is 20 μm and the surface glossiness is 120 g.u.

[0066] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0067] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and the PET and PVC films are bonded by an embossing roller and a rubber roller.

[0068] The film is cooled, trimmed and rolled to obtain the adhesive-free PET composite PVC film.

[0069] The calendering temperature is controlled at 190℃ for wheel 1#, 190℃ for wheel 2#, 195℃ for wheel 3#, 183℃ for wheel 4# and 183℃ for wheel 5#. The speed of the five rollers is 8m / min for wheel 1#, 22m / min for wheel 2#, 29m / min for wheel 3#, 38m / min for wheel 4# and 42m / min for wheel 5#. The stretching ratio between the take-up wheel and the embossing wheel is 1.3. The embossing roller is a mirror roller. The temperature is controlled between 5℃ and 15℃. The rubber wheel is 600 mesh and the temperature is controlled between 20℃ and 30℃. The speed ratio between the embossing wheel and the rubber wheel is controlled at 1:0.9. The embossing pressure is 50N and the PET unwinding tension is 8N.

[0070] Example 3

[0071] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 30 parts by weight of plasticizer, 6 parts by weight of stabilizer, 1.5 parts by weight of processing aid, 1.2 parts by weight of anti-ultraviolet agent, and 6 parts by weight of impact modifier.

[0072] In this embodiment, the method for preparing the adhesive-free PET composite PVC film of the present invention comprises the following steps:

[0073] The PET film is placed on a laminating frame. The thickness of the PET film is 30 μm and the surface glossiness is 150 g.u.

[0074] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0075] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and the PET and PVC films are bonded by an embossing roller and a rubber roller.

[0076] The film is cooled, trimmed and rolled to obtain the adhesive-free PET composite PVC film.

[0077] The calendering temperature is controlled at 185℃ for wheel 1#, 185℃ for wheel 2#, 188℃ for wheel 3#, 177℃ for wheel 4# and 175℃ for wheel 5#. The speed of the five rollers is 10m / min for wheel 1#, 26m / min for wheel 2#, 33m / min for wheel 3#, 38m / min for wheel 4# and 45m / min for wheel 5#. The stretching ratio between the take-up wheel and the embossing wheel is 1.3. The embossing roller is a mirror roller. The temperature is controlled between 5℃ and 15℃. The rubber wheel is 600 mesh and the temperature is controlled between 20℃ and 30℃. The speed ratio between the embossing wheel and the rubber wheel is controlled at 1:0.8. The embossing pressure is 60N and the PET unwinding tension is 12N.

[0078] Example 4

[0079] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 30 parts by weight of plasticizer, 6 parts by weight of stabilizer, 1.5 parts by weight of processing aid, 1.2 parts by weight of anti-ultraviolet agent, and 6 parts by weight of impact modifier.

[0080] In this embodiment, the method for preparing the adhesive-free PET composite PVC film of the present invention comprises the following steps:

[0081] The PET film is placed on a laminating frame. The thickness of the PET film is 40 μm and the surface glossiness is 150 g.u.

[0082] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0083] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and the PET and PVC films are bonded by an embossing roller and a rubber roller.

[0084] The film is cooled, trimmed and rolled to obtain the adhesive-free PET composite PVC film.

[0085] The calendering temperature is controlled at 185℃ for wheel 1#, 185℃ for wheel 2#, 188℃ for wheel 3#, 177℃ for wheel 4# and 175℃ for wheel 5#. The speed of the five rollers is 6m / min for wheel 1#, 15m / min for wheel 2#, 29m / min for wheel 3#, 33m / min for wheel 4# and 38m / min for wheel 5#. The stretching ratio of the take-up wheel and the embossing wheel is 1.45. The embossing roller is a mirror roller. The temperature is controlled between 15℃ and 25℃. The rubber wheel is 600 mesh and the temperature is controlled between 30℃ and 40℃. The speed ratio of the embossing wheel and the rubber wheel is controlled at 1:0.8. The embossing pressure is 50N and the PET unwinding tension is 16N.

[0086] Example 5

[0087] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 35 parts by weight of plasticizer, 6 parts by weight of stabilizer, 2 parts by weight of processing aid, 1.2 parts by weight of anti-ultraviolet agent, and 8 parts by weight of impact modifier.

[0088] In this embodiment, the method for preparing the adhesive-free PET composite PVC film of the present invention comprises the following steps:

[0089] The PET film is placed on a laminating frame. The thickness of the PET film is 50 μm and the surface glossiness is 150 g.u.

[0090] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0091] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and the PET and PVC films are bonded by an embossing roller and a rubber roller.

[0092] The film is cooled, trimmed and rolled to obtain the adhesive-free PET composite PVC film.

[0093] The calendering temperature is controlled at 180℃ for wheel 1#, 180℃ for wheel 2#, 185℃ for wheel 3#, 177℃ for wheel 4# and 175℃ for wheel 5#. The speed of the five rollers is 10m / min for wheel 1#, 26m / min for wheel 2#, 33m / min for wheel 3#, 38m / min for wheel 4# and 45m / min for wheel 5#. The stretching ratio between the take-up wheel and the embossing wheel is 1.3. The embossing roller is a mirror roller. The temperature is controlled between 5℃ and 15℃. The rubber wheel is 600 mesh and the temperature is controlled between 20℃ and 30℃. The speed ratio between the embossing wheel and the rubber wheel is controlled at 1:1. The embossing pressure is 50N and the PET unwinding tension is 16N.

[0094] Example 6

[0095] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 26 parts by weight of plasticizer, 5 parts by weight of stabilizer, 1 part by weight of processing aid, 1 part by weight of anti-ultraviolet agent, 4 parts by weight of impact modifier, and 2 parts by weight of PVC brightener.

[0096] In this embodiment, the use of PVC brightener is increased to improve the processing fluidity of PVC and increase the surface gloss of PVC.

[0097] In this embodiment, the method for preparing the adhesive-free PET composite PVC film of the present invention comprises the following steps:

[0098] The PET film is placed on a laminating frame. The thickness of the PET film is 20 μm and the surface glossiness is 120 g.u.

[0099] Add PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier, processing aid and PVC brightener into a high-speed mixer according to the proportion, stir, and then cool to room temperature to obtain a premix;

[0100] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0101] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and the PET and PVC films are bonded by an embossing roller and a rubber roller.

[0102] The film is cooled, trimmed and rolled to obtain the adhesive-free PET composite PVC film.

[0103] The calendering temperature is controlled at 190℃ for wheel 1#, 190℃ for wheel 2#, 195℃ for wheel 3#, 183℃ for wheel 4# and 183℃ for wheel 5#. The speed of the five rollers is 8m / min for wheel 1#, 22m / min for wheel 2#, 29m / min for wheel 3#, 38m / min for wheel 4# and 42m / min for wheel 5#. The stretching ratio between the take-up wheel and the embossing wheel is 1.4. The embossing roller is a mirror roller. The temperature is controlled between 5℃ and 15℃. The temperature of the rubber wheel is controlled between 20℃ and 30℃. The speed ratio between the embossing wheel and the rubber wheel is controlled at 1:0.9. The embossing pressure is 50N and the PET unwinding tension is 8N.

[0104] Comparative Example 1

[0105] The difference from the embodiment is that the preparation process and steps do not include lamination.

[0106] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 26 parts by weight of plasticizer, 5 parts by weight of stabilizer, 1 part by weight of processing aid, and 6 parts by weight of impact modifier.

[0107] The PVC film preparation method comprises the following steps:

[0108] Add PVC resin, plasticizer, stabilizer and processing aid into a high-speed mixer according to the proportion, stir, and then cool to room temperature to obtain a premix;

[0109] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0110] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and embossed by an embossing roller and a rubber roller;

[0111] The PVC film is cooled, cut and rolled up to obtain the PVC film.

[0112] The calendering temperature is controlled at 190℃ for wheel 1#, 190℃ for wheel 2#, 195℃ for wheel 3#, 183℃ for wheel 4# and 183℃ for wheel 5#. The speeds of the five rollers are 8m / min for wheel 1#, 22m / min for wheel 2#, 29m / min for wheel 3#, 38m / min for wheel 4# and 42m / min for wheel 5#. The stretching ratio between the take-off wheel and the embossing wheel is 1.4. The embossing roller is a mirror roller. The temperature is controlled between 5℃ and 15℃. The temperature of the rubber wheel is controlled between 20℃ and 30℃. The speed ratio between the embossing wheel and the rubber wheel is controlled at 1:0.9. The embossing pressure is 50N.

[0113] Comparative Example 2

[0114] The PVC film includes the following components by weight: 100 parts by weight of PVC resin, 26 parts by weight of plasticizer, 5 parts by weight of stabilizer, 1 part by weight of processing aid, and 6 parts by weight of impact modifier.

[0115] The PVC film preparation method comprises the following steps:

[0116] Add PVC resin, plasticizer, stabilizer, anti-ultraviolet agent and processing aid into a high-speed mixer according to the proportion, stir, and then cool to room temperature to obtain a premix;

[0117] The obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter;

[0118] Then it is calendered by a five-roll calender, drawn out by a take-up wheel, and embossed by an embossing roller and a rubber roller;

[0119] The PVC film is obtained by cooling, cutting and winding.

[0120] The calendering temperature is controlled at 185℃ for wheel 1#, 185℃ for wheel 2#, 190℃ for wheel 3#, 177℃ for wheel 4# and 177℃ for wheel 5#. The speed of the five rollers is 8m / min for wheel 1#, 22m / min for wheel 2#, 29m / min for wheel 3#, 38m / min for wheel 4# and 42m / min for wheel 5#. The stretching ratio between the take-off wheel and the embossing wheel is 1.5. The embossing roller is a mirror roller. The temperature is controlled between 5℃ and 15℃. The temperature of the rubber wheel is controlled between 20℃ and 30℃. The speed ratio between the embossing wheel and the rubber wheel is controlled at 1:0.9 and the embossing pressure is 60N.

[0121] Performance Testing

[0122] The mechanical properties of the materials were tested according to the standard GB / T1040.3-2006 Determination of tensile properties of plastics (Part 3); the light transmittance of the materials was tested using the LS182 solar film tester; the surface gloss of the materials was tested according to the standard GB / T8807-1988 plastic mirror gloss test method, and the film and sheet heating dimensional change rate test method was tested according to the standard GB / T12027-2004; the comprehensive properties of the PVC films of Examples 1 to 5 and Comparative Examples 1 to 2 were tested, and the PET composite PVC film was torn off before testing, and the PVC film properties were tested. The results are shown in Table 1.

[0123] Table 1 Comparison of material properties obtained in various embodiments and comparative examples

[0124]

[0125] It can be seen from Table 1 that the tensile strength and elongation at break of the PVC films prepared in Examples 1 to 6 are close to those of Comparative Examples 1 to 3, indicating that the preparation process of the glue-free PET composite PVC film does not affect the physical properties of the material.

[0126] The light transmittance of the PVC films prepared in Examples 1 to 6 is higher than that of Comparative Examples 1 to 2 because Examples 1 to 5 have high gloss on both sides, the product surface is smooth, and light scattering is less, so the light transmittance is high, while the product surface of Comparative Examples 1 to 2 is smooth on one side and rough on the other side, so light scattering is more and the light transmittance is lower. The glossiness of the front and back sides of the PVC films prepared in Examples 1 to 5 is high, and is significantly higher than that of Comparative Examples 1 to 2.

[0127] The dimensional change rate of the PVC films prepared in Examples 1 to 6 is significantly lower than that in Comparative Examples 1 to 2. The reason is that the PET material applied is dimensionally stable and can effectively control the internal stress of the PVC film and reduce shrinkage.

[0128] The PVC film prepared in Example 6 has the highest surface gloss, indicating that the PVC brightener improves the fluidity of the material and can increase the surface gloss of the PVC film.

[0129] The results in Table 1 show that the glue-free PET composite PVC film of the embodiment of the present invention has more superior light transmittance and lower shrinkage. The glue-free PET composite PVC film prepared by the present invention solves the core matting problem in the industry and has obvious market competitiveness in terms of advertising film market performance.

[0130] In summary, the glue-free PET composite PVC film and the preparation method thereof proposed in the present invention adopt a high molecular weight polyester plasticizer and a composite anti-ultraviolet agent to improve the weather resistance and ultraviolet light resistance of the PVC film; and adopt an acrylic ester impact modifier to improve the processing performance of the product and the toughness of the finished product.

[0131] Through the production process of the present invention, PET and PVC are compounded, and the PET film plays a protective role and fits tightly with PVC to reduce shrinkage. Since PET is a bright and high-gloss product, after compounding the PVC film, both contact surfaces of the PVC film are bright, which successfully solves the problem of the core extinction. Even in conventional storage environments, extinction will not occur. In addition, this compounding method further improves the glossiness of the product surface, achieves double-sided high gloss, and makes the product have higher transparency. During use, customers only need to peel off the PET film and use it directly without having to perform light-reflecting treatment on the product. By compounding a layer of protective film, the convenience of use is greatly improved.

[0132] The prior art uses a two-step method to roll up the PVC calendered film and then unroll it to bond PET. The matte contact during rolling will reduce the surface gloss of the PVC film (especially the matte core), and the high gloss will not be restored when bonding again, and the transparency is not as high as the gloss of the product made by the method of the present invention. At the same time, the PVC calendered film will shrink by itself after rolling up, and the actual film area will decrease when bonding PET. However, through the technical means of the present invention, since the product has low shrinkage characteristics and is protected by PET, the area of ​​the PVC film will not decrease. In addition, the process of the present invention can save many costs such as transportation and packaging, simplify the production and processing flow, reduce manufacturing costs, and improve production efficiency.

[0133] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0134] The description and application of the present invention here are illustrative, and it is not intended to limit the scope of the present invention to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and change of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent parts are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the present invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the present invention. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the present invention.

Claims

1. A non-adhesive PET composite PVC film, characterized in that: The adhesive-free PET composite PVC film comprises: 100 parts by weight of PVC resin, 16 to 50 parts by weight of plasticizer, 2 to 8 parts by weight of stabilizer, 0.5 to 2 parts by weight of processing aid, 0.5 to 2 parts by weight of anti-ultraviolet agent and 2 to 10 parts by weight of impact modifier.

2. The adhesive-free PET composite PVC film according to claim 1, characterized in that: The plasticizer is a polyester plasticizer with a molecular weight between 1500 and 6000; the impact-resistant agent is an acrylic ester modifier.

3. The adhesive-free PET composite PVC film according to claim 1, characterized in that: The anti-ultraviolet agent comprises 2 parts by weight of an ultraviolet absorber and 0.5-2 parts by weight of a hindered amine light stabilizer.

4. The adhesive-free PET composite PVC film according to claim 1, characterized in that: The adhesive-free PET composite PVC film also includes a PVC brightener; the PVC brightener is silicone powder.

5. A method for preparing a non-adhesive PET composite PVC film, characterized in that: The preparation method comprises: Step S1, placing the PET film on a laminating frame; Step S2, adding PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier and processing aid into a mixing device according to a set ratio, stirring, and then cooling to room temperature to obtain a premix; Step S3, plasticizing and filtering the obtained premix; Step S4, rolling the material processed in step S3 into a film, drawing it out through a drawing wheel, and then laminating the PET film and the PVC film; Step S5, cooling, trimming and rolling the material processed in step S4 to obtain a non-adhesive PET composite PVC film.

6. The method for preparing the non-adhesive PET composite PVC film according to claim 5, characterized in that: The mass fractions of the PVC resin, plasticizer, stabilizer, anti-ultraviolet agent, impact modifier and processing aid are as follows: The mass part of PVC resin is 100 parts, the mass part of plasticizer is 16-50 parts, the mass part of stabilizer is 2-8 parts, the mass part of processing aid is 0.5-2 parts, the mass part of anti-ultraviolet agent is 0.5-2 parts, and the mass part of impact modifier is 2-10 parts.

7. The method for preparing the adhesive-free PET composite PVC film according to claim 5, characterized in that: The thickness of the PET film is between 20 μm and 80 μm, and the surface glossiness is greater than or equal to 100 g.u. The online lamination is to transport the PET film to the embossing front section through a guide wheel to complete the lamination with the PVC.

8. The method for preparing the adhesive-free PET composite PVC film according to claim 5, characterized in that: In step S2, the raw materials added to the mixer further include PVC brightener, and the PVC brightener is silicone powder.

9. The method for preparing the adhesive-free PET composite PVC film according to claim 5, characterized in that: The five-roll calendering temperature is between 160°C and 200°C, the five-roll roller speed is 5 to 60 m / min, and the draw ratio between the take-up wheel and the embossing wheel is 1.2 to 1.8; The embossing roller is a mirror roller with a temperature between 5°C and 30°C, the rubber roller is 600 mesh and the temperature is between 20°C and 40°C; the speed ratio of the embossing roller to the rubber roller is controlled between 1:0.6 and 1.2; the embossing pressure is between 40 and 70N, and the PET unwinding tension is between 6 and 30N.

10. The method for preparing the adhesive-free PET composite PVC film according to claim 5, characterized in that: In step S3, the obtained premix is ​​plasticized by an internal mixer, plasticized by a double-roll mill, and filtered by a filter; In step S4, the material processed in step S3 is calendered into a film by a five-roll calender, drawn out by a take-up wheel, and then the PET and PVC films are bonded by an embossing roller and a rubber roller.

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