Preparation method and application of composite material

Abstract

The invention discloses a preparation method and application of a composite material, according to the preparation method, non-woven flame-retardant polyester is subjected to PE lamination, then electron radiation is carried out in a salicylate ultraviolet absorbent, the ultraviolet absorbent can be grafted with a polyester layer and a PE layer in the radiation process to improve the binding force, and on the premise that the ductility is guaranteed, the tensile strength of the composite material is improved. Meanwhile, the tearing strength and the aging resistance of the composite material are improved; in addition, the material is endowed with water repellency, oil repellency and the like based on the characteristics of the lamination layer, can be widely applied to paint surface protection, such as automobile paint surface protection as an automobile cover, and has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of surface protective film materials, and specifically relates to a preparation method and application of a composite material. Background Art

[0002] Polymer composite protective film materials are widely used in many fields such as ocean, energy, construction, transportation, aerospace and military equipment. During use and transportation, the surface of equipment or components will inevitably be damaged by various external conditions, resulting in scratches and damage. With the development of polymer materials, various forms or functional coating materials have given protective films many functions, which have great economic value and development space.

[0003] Take car covers as an example. With the rapid development of the automobile industry, car paint protection has become an issue of increasing concern to car owners. Car covers are invisible films that are applied to the surface of a car to protect its paint. They can isolate the paint from the air and prevent it from contacting with rain, dust and some impurities, which may lead to corrosion, aging or cracking. In addition, invisible car covers can also protect the car from damage and scratches while it is in motion, while ensuring the appearance of the car body.

[0004] Nowadays, invisible car covers are generally made of polyurethane (PU) or polyvinyl chloride (PVC) materials. Although they can provide a certain degree of protection for the car paint, the material has weak tearing properties, low ductility under low temperature conditions, and poor weather resistance, which is not conducive to the promotion and popularization of car cover products.

[0005] Therefore, it is necessary to design a new type of composite material to improve tear resistance and ductility for use in invisible car cover products to more effectively protect the car paint. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a method for preparing a composite material, which has at least solved one of the many defects of the prior art materials, such as tearing performance, low ductility under low temperature conditions, and poor weather resistance.

[0007] To solve the above problems, the scheme of the present invention is as follows: The first aspect of the present invention is to provide a method for preparing a composite material, the steps comprising: S1. coating the surface of non-woven flame-retardant polyester with a PE layer and drying; S2. Immerse the material obtained in step S1 in a solution containing a salicylate ultraviolet absorber, perform electron irradiation, and then obtain a composite material after washing and drying; the radiation dose of the electron irradiation process is 60-180 kGy.

[0008] Furthermore, in step S2, the concentration of the ultraviolet absorber in the solution is 5-20wt%, and the mass ratio of the solution to the material obtained in step S1 is (10-50):1.

[0009] Preferably, in step S2, the soaking time is 10-60 minutes.

[0010] Preferably, in step S2, the ultraviolet absorber is selected from one or more of ethylhexyl salicylate, trimethylol salicylate, octyl salicylate, phenyl salicylate, isohexadecanyl salicylate, hexyl salicylate, ethylene glycol salicylate and benzyl salicylate.

[0011] Furthermore, in step S2, the solvent used in the ultraviolet absorber solution is alcohol and / or ether; and the washing process uses a washing liquid containing alcohol and / or ether.

[0012] Furthermore, in step S1, the coating process is performed on both sides of the polyester layer.

[0013] Furthermore, in step S1, the thickness of the coated PE layer is 0.1-0.6 mm.

[0014] Furthermore, the preparation of the nonwoven flame-retardant polyester adopts the commonly used non-woven fabric preparation method in the art, and the steps include flame-retardant polyester fiber selection → fiber opening and mixing → carding and laying → pre- and main needling → raising → gluing → drying.

[0015] Furthermore, the "flame retardant" in the non-woven flame retardant polyester refers to modified polyester whose limiting oxygen index LOI meets the national standard, and the modification methods include but are not limited to copolymerization flame retardant modification, blending flame retardant modification, and flame retardant finishing using phosphorus-containing compounds or halogen-containing olefin monomers.

[0016] Furthermore, in step S1, the mass per square meter of the material obtained in step S1 is 800-1000 g / m 2 .

[0017] The second object of the present invention is to provide a paint protection film, comprising a composite material obtained by the preparation method described in the first aspect above.

[0018] Furthermore, the paint protection film is coated with an adhesive layer on the back of the composite material for bonding with the paint surface.

[0019] The third object of the present invention is to propose the application of the composite material obtained by the preparation method described in the first aspect in paint surface protection. Furthermore, the paint protection includes but is not limited to paint protection of equipment and articles that are often placed outdoors but does not affect their use, such as being used as car covers.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The preparation method of the composite material proposed in the present invention comprises the following steps: PE coating is performed on non-woven flame-retardant polyester, and then electron irradiation is performed in a salicylate ultraviolet absorber. During the irradiation process, the ultraviolet absorber can be grafted with the polyester layer and the PE layer to enhance the bonding strength. While ensuring the ductility, the tear strength and aging resistance of the composite material are improved at the same time.

[0021] The composite material obtained by the preparation method of the present invention can also give the material water-repellent, oil-repellent and other properties based on the characteristics of the coating layer, and can be widely used for paint protection, such as car cover for automobile paint protection, and has a wide range of application prospects. In addition, the preparation method is simple in process, the material is easily available, and it is suitable for industrial production. DETAILED DESCRIPTION

[0022] The following examples are used to illustrate the present invention, but do not limit the scope of the present invention. Without departing from the spirit and essence of the present invention, modifications or substitutions made to the methods, steps or conditions of the present invention are within the scope of the present invention.

[0023] The nonwoven flame-retardant polyester used in the following examples is obtained by copolymerization modification with phosphorus-based flame retardant 2-carboxyethylphenylphosphinic acid (CEPPA), and the flame retardant addition amount is 10 wt %. Unless otherwise specified, the experimental means used are methods known in the art.

[0024] Example 1 1) Coat the non-woven flame-retardant polyester with a PE layer on both sides and dry it; control the coating thickness to 0.6mm and the material weight per square meter to 1000g / m 2 ; 2) 100 g of the material obtained in step 1) was rolled up and immersed in 5000 g of an ethanol solution containing 5 wt% ethylhexyl salicylate as a UV absorber for 60 min, irradiated with electrons at a dose of 80 kGy, washed twice with ethanol, and dried to obtain a composite material.

[0025] Example 2 1) Coat the non-woven flame-retardant polyester with a PE layer on both sides and dry it; control the coating thickness to 0.3mm and the material weight per square meter to 900g / m 2 ; 2) 100 g of the material obtained in step 1) was curled and immersed in 3000 g of an ethanol solution containing 10 wt % isocetyl salicylate as a UV absorber for 45 min, and then irradiated with electrons at a radiation dose of 100 kGy, and then washed twice with ethanol and dried to obtain a composite material.

[0026] Example 3 1) Coat the non-woven flame-retardant polyester with a PE layer on both sides and dry it; control the coating thickness to 0.1mm and the material weight per square meter to 800g / m 2 ; 2) 100 g of the material obtained in step 1) was curled and immersed in 1500 g of an ethanol solution containing 25 wt% octyl salicylate as a UV absorber for 30 min, and then irradiated with electrons at a radiation dose of 180 kGy, and then washed twice with ethanol and dried to obtain a composite material.

[0027] Comparative Example 1 The preparation method and conditions of the composite material are the same as those of Example 1, except that step 2) is not included.

[0028] Comparative Example 2 The preparation method and conditions of the composite material are the same as those of Example 1, except that the nonwoven flame-retardant polyester is first subjected to electron irradiation, washed and dried; and then coated with a PE layer on both sides and dried.

[0029] Comparative Example 3 The preparation method and conditions of the composite material are the same as those of Example 1, except that the electron radiation dose in step 2) is 30 kGy.

[0030] Experimental Example Performance Test The mechanical properties and aging resistance of the composite materials obtained in the above examples 1-3 and comparative examples 1-3 were tested respectively. During the experiment, three portions of the prepared material with a size of 10 cm×20 cm were taken, and the three portions were tested and the average value was taken.

[0031] 1) Tensile strength test: The tensile strength was tested in accordance with the standard GB / T 3923.1-2013. Among the tensile performance indicators, the longitudinal elongation at break of the composite materials obtained in Examples 1-3 was 71.1%-71.8%, and the transverse breaking strength reached 1568.3 N-1572.1 N, which showed both outstanding strength and excellent ductility.

[0032] 2) Tear strength test: Tear strength is in accordance with GB / T 3923.1-2013.

[0033] 2) Aging resistance test: Use an aging tester to test, spread the composite material flat on the sample plate and stretch it naturally, set the temperature to 50℃, and the light intensity to 0.90W / m 2 , 1 hour of illumination can be converted into 24 hours of direct sunlight at noon in summer. The aging resistance is evaluated by the strength retention rate under different illumination durations.

[0034] The tear strength test and aging resistance test results are shown in Table 1 and Table 2 respectively.

[0035] Table 1: Tear strength test results Table 2: Aging resistance test results From the above results, it can be seen that Examples 1-3 have better performance in tensile strength, tear strength and aging resistance, indicating that the use of PE coating combined with impregnation of ultraviolet absorbers and electron irradiation can significantly improve the comprehensive performance of composite materials to meet the wide range of requirements for the use of paint protection films. The possible reason is that after the coating material is impregnated with salicylate ultraviolet absorbers, a certain amount of electron irradiation is applied, which helps the chemical grafting of each layer of the material with the salicylate ultraviolet absorbers, thereby synergistically improving the mechanical properties and aging resistance of the material. Comparative Example 1 was not subjected to electron irradiation, and Comparative Example 2 only subjected the polyester layer to ultraviolet absorption, impregnation and electron irradiation, and the related properties were significantly reduced; in addition, the performance of Comparative Example 3 was relatively severely reduced due to the small amount of radiation, which shows that the amount of electron radiation has an effect on the grafting between the layers of ultraviolet absorbers.

[0036] The present invention is not limited to what is described in the specification and implementation modes, and therefore, additional advantages and improvements can be easily realized by those familiar with the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details, representative schemes and described embodiments.

Claims

1. A method for preparing a composite material, characterized in that the steps include: S1. coating the surface of non-woven flame-retardant polyester with a PE layer and drying; S2. Immerse the material obtained in step S1 in a solution containing a salicylate ultraviolet absorber, perform electron irradiation, and then obtain a composite material after washing and drying; the radiation dose of the electron irradiation process is 60-180 kGy.

2. The preparation method according to claim 1, characterized in that: In step S2, the concentration of the ultraviolet absorber in the solution is 5-20wt%, and the mass ratio of the solution to the material obtained in step S1 is (10-50):

1.

3. The preparation method according to claim 2, characterized in that: In step S2, the soaking time is 10-60 minutes.

4. The preparation method according to claim 1, characterized in that: In step S2, the ultraviolet absorber is selected from one or more of ethylhexyl salicylate, trimethylol salicylate, octyl salicylate, phenyl salicylate, isohexadecanyl salicylate, hexyl salicylate, ethylene glycol salicylate and benzyl salicylate.

5. The preparation method according to claim 1, characterized in that: In step S2, the solvent used in the ultraviolet absorber solution is alcohol and / or ether; and the washing process uses a washing liquid containing alcohol and / or ether.

6. The preparation method according to claim 1, characterized in that: In step S1, the coating process is performed on both sides of the polyester layer.

7. The preparation method according to claim 1, characterized in that: In step S1, the thickness of the coating PE layer is 0.1-0.6 mm.

8. The preparation method according to claim 1, characterized in that: In step S1, the mass per square meter of the material obtained in step S1 is 800-1000 g / m 2 .

9. Paint protection film, characterized in that: A composite material obtained by the preparation method according to any one of claims 1 to 8.

10. Use of the composite material obtained by the preparation method according to any one of claims 1 to 8 in paint surface protection.

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