Antistatic impact-resistant pet sheet and method for preparing the same

Abstract

The application relates to the technical field of PET sheets, in particular to an anti-static impact-resistant PET sheet and a preparation method thereof. The anti-static impact-resistant PET sheet of the application comprises PET resin and a modifier. The PET resin and the modifier are melt-blended, extruded and sliced to prepare the anti-static impact-resistant PET sheet. The modifier has an important influence on the anti-static performance and the impact resistance of the PET sheet. The preparation method of the modifier comprises the following steps: firstly, unsaturated glycidyl ester is reacted with amino siloxane; then, the unsaturated glycidyl ester is grafted on the POE molecular chain through melt grafting; finally, the acid-doped polyaniline layer is coated by using an in-situ polymerization method. The modifier obtained through the above preparation method has good compatibility with the PET resin, the interface bonding strength between the POE and the polyaniline is high, in addition, organic montmorillonite and nano zinc oxide can be introduced into the above modifier, and the anti-static performance and the impact resistance of the PET sheet can be further improved.

Description

Technical Field

[0001] The present application relates to the technical field of PET sheets, and in particular to an anti-static and impact-resistant PET sheet and a preparation method thereof. Background Art

[0002] PET is the most important type of thermoplastic resin. Its high crystallinity and excellent creep resistance, chemical resistance, wear resistance, and dimensional stability make it widely used in machinery, healthcare, fibers, electronics, automobiles, thin films, and other fields. However, the rigid benzene ring in PET's molecular structure, which is difficult to rotate, produces a significant steric hindrance. Furthermore, the double bond in the ester group forms a conjugated effect with the benzene ring, making it difficult for the chain segments to move. As a result, the PET molecular chain is relatively rigid and has poor flexibility, resulting in poor toughness and impact resistance. Furthermore, while PET has excellent electrical insulation properties, its high electrical resistance makes it prone to static electricity accumulation, leading to undesirable phenomena such as dust absorption and spark discharges. When used in the electronics and electrical fields, static electricity can easily damage electronic components, affecting the quality of electronic products.

[0003] The main methods for modifying the antistatic and impact resistance of PET include blending and chemical modification. Blending modification involves blending PET resin with an antistatic agent and a toughening agent. This method is simple to process and easy to adjust properties, but may present compatibility and aging issues, leading to unstable blend properties. Chemical modification involves introducing antistatic functional groups or flexible segments into the PET molecular chain, altering the PET molecular chain structure and thereby improving the antistatic and impact resistance of PET. While this method produces materials with high performance stability, it is complex, with difficult-to-control reaction conditions and difficulty adjusting properties.

[0004] The patent application document with publication number CN104419148A discloses an antistatic PBT / PET alloy toughened with core-shell particles. Antistatic masterbatch and core-shell ions are blended with the PBT / PET alloy to improve the antistatic performance and toughness of the PBT / PET alloy. The toughened core-shell particles are composed of calcium carbonate particles pretreated with maleic anhydride as the core and POE as the shell. Such hard-core and soft-shell core-shell particles are used for toughening. The soft shell layer is relatively thick. Even after modification with maleic anhydride, it may still have poor compatibility with the PBT / PET matrix. During the processing, problems such as uneven dispersion and phase separation may occur, resulting in unstable material performance. Moreover, the aging resistance of the soft shell is relatively poor compared to the hard core and PBT / PET matrix. Therefore, the toughening effect may decay over time, resulting in performance degradation of the material after a period of use. Summary of the Invention

[0005] In order to improve the antistatic and impact resistance of PET, the present application provides an antistatic and impact-resistant PET sheet and a preparation method thereof.

[0006] An antistatic and impact-resistant PET sheet comprises the following components in parts by weight: 80-95 parts of PET resin and 5-20 parts of a modifier; a method for preparing the modifier comprises the following steps:

[0007] S1: dissolving unsaturated glycidyl ester in an organic solvent, preheating the mixture, adding aminosiloxane, reacting the mixture, drying the mixture, adding an oxidant and POE, melt-extruding the mixture, cooling the mixture, and pelletizing the mixture to obtain pellets;

[0008] S2: Mix aniline and pellets, add acid solution, stir to react, add initiator, continue to react for 5-10 hours, let stand, filter, and vacuum dry.

[0009] In the above technical solution, the modifier is a soft-core hard-shell structure with modified POE as the core and acid-doped polyaniline as the shell, which has good toughening effect and anti-static performance. When the PET material is subjected to impact stress, the stress is transferred to the soft core through the hard shell. Since the soft-core POE is a thermoplastic elastomer material with good elasticity, when it receives a stress impact, it absorbs the impact energy through elastic deformation, reducing the stress further transferred to the matrix, thereby improving the impact resistance of the PET material. In addition, the soft-core hard-shell structure can act as a heterogeneous nucleating agent to promote the crystallization process of PET, shorten the crystallization time, and increase the degree of crystallinity. It will also make the crystallization more perfect, the grain size smaller, and the grain distribution more uniform, thereby reducing stress concentration and improving toughness, thereby improving the transparency and impact resistance of PET.

[0010] The modified soft core POE can improve the interface bonding strength between the soft core and the hard shell of polyaniline, thereby improving the continuity of stress transfer between the soft core and the hard shell. This is because: first, the unsaturated glycidyl ester has an epoxy group in the molecular structure, which reacts with the amino group or imino group in the amino siloxane to form a tertiary amine group. The tertiary amine group forms a quaternary ammonium salt ion under acidic conditions, which can form electrostatic adsorption with the lone pair of electrons in polyaniline, thereby improving the bonding strength with polyaniline. Second, the amino siloxane is hydrolyzed in an aqueous solution to form a silanol group, which can form a hydrogen bond with the amino group or imino group in the polyaniline molecule, thereby improving the interface bonding force between the polyaniline. Moreover, the silanol groups condense with each other to form a network structure crosslinked by silicon dioxide. Through in-situ polymerization, the rigid segments of polyaniline grow in the crosslinked network structure to form an "anchoring" structure, further improving the interface bonding force between POE and polyaniline. Therefore, when the interface bonding force between the soft core and the hard shell is strong, the soft core and the hard shell are difficult to separate, thereby improving the continuity of stress transfer between the hard shell and the soft core, and further improving the impact resistance of the PET material.

[0011] In addition, the quaternary ammonium salt formed by the tertiary amine group under acidic conditions is conducive to forming a continuous conductive network with the conductive channels of acid-doped polyaniline, thereby improving the antistatic performance.

[0012] The hard shell not only has the function of transmitting stress, but also has good mechanical properties and aging resistance, which can protect the soft core and reduce the deformation or rupture of the soft core during the processing or use of PET, thereby improving the durability of the toughening effect. In addition, the amino group or imino group in the hard shell polyaniline can form a hydrogen bond with the hydroxyl group, ester group, carboxyl group, etc. in PET, thereby improving the dispersibility of the modifier in PET, and further improving the performance stability of the PET material.

[0013] Preferably, in step S1, the unsaturated glycidyl ester is one or more of glycidyl methacrylate, glycidyl oleate, glycidyl linoleate, and glycidyl linolenate; the amino siloxane is one or more of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, and diethylenetriaminepropyltrimethoxysilane; and the mass ratio of the unsaturated glycidyl ester to the amino siloxane is 1:(0.1-0.35).

[0014] In this technical solution, aminosilicone reacts with unsaturated glycidyl esters. The epoxy groups in the unsaturated glycidyl esters react with the amino or imino groups in the aminosilicone, causing the epoxy groups to ring-open and ultimately form tertiary amine groups. These tertiary amine groups act as a bridge between the soft core and the hard shell, thereby enhancing the bonding strength between the two. Furthermore, upon hydrolysis, the aminosilicone forms a silica-crosslinked network, further enhancing the interfacial bonding strength between the soft core and the hard shell, thereby improving the impact resistance of PET.

[0015] Preferably, in step S1, the oxidant is benzoyl peroxide or dicumyl peroxide; the POE is ethylene-butene copolymer; and the mass ratio of the POE, unsaturated glycidyl ester, and oxidant is 1000:(10-50):(2-10).

[0016] In the above technical solution, under the action of an oxidant, polar groups are grafted onto the flexible molecular chain of POE through free radical polymerization, and a polyaniline shell layer is coated on the outside of POE by an in-situ polymerization method. The introduction of the polar groups is beneficial to improving the bonding strength between POE and polyaniline. When the PET material is subjected to stress shock, the stress shock can be continuously transmitted through the hard shell to the soft core and absorbed, thereby improving the impact resistance of the PET material.

[0017] Preferably, in step S1, the temperature of the melt extrusion is 160-190°C.

[0018] Preferably, in step S2, the acid is one or more of hydrochloric acid, sulfuric acid, nitric acid, citric acid and camphorsulfonic acid; the initiator is ammonium persulfate or potassium persulfate; and the mass ratio of the aniline, pellets, acid and initiator is 10:(15-30):(0.45-2.5):(2.5-5).

[0019] In the above technical solution, the organic acid or inorganic acid not only serves as a dopant for the polyaniline, but also provides an acidic environment. Therefore, the amount of acid added should be within an appropriate range. If the amount of acid added is too little, the doping effect is poor, which reduces the conductivity of the doped polyaniline. Moreover, when the acidity is weak, it is not conducive to the formation and stability of quaternary ammonium salt ions, making it difficult to form a continuous conductive network, and the interfacial force between the soft core and the hard shell is also weakened, thereby affecting the antistatic effect and impact resistance of PET. If the amount of acid added is too much, it will cause excessive doping, which will also reduce the conductivity of the polyaniline, thereby affecting the antistatic effect of PET.

[0020] Preferably, in step S2, organic montmorillonite is further added, and the mass ratio of the aniline to the organic montmorillonite is 100:(5-12); the organic montmorillonite is prepared by a method comprising the following steps:

[0021] Mix Na-montmorillonite with water, stir at 70-90°C for 2-6 hours, add cationic surfactant, react for 6-12 hours, filter, wash and dry to obtain the product.

[0022] In the above technical solution, firstly, the organic montmorillonite is dispersed in polyaniline by in-situ polymerization, which is beneficial to strengthening the interfacial bonding force between the organic montmorillonite flakes and polyaniline, reducing the agglomeration of the montmorillonite, and effectively transferring stress, thereby improving the impact resistance. Secondly, montmorillonite is a layered material. After organic modification, the interlayer spacing increases. When the PET material is subjected to stress, the organic montmorillonite flakes are prone to slippage, absorbing and dissipating part of the impact energy. Moreover, the slippage of the flakes will also force the crack path to deflect, increasing the resistance to crack propagation. At the same time, the slipping flake material can bridge the two sides of the crack to prevent further crack expansion.

[0023] In addition, cationic surfactants are not only used to intercalate between montmorillonite sheets, but also help to improve the antistatic properties.

[0024] Further preferably, the cationic surfactant is one or more of cetyltrimethylammonium bromide, tetradecyltrimethylammonium bromide and dodecyltrimethylammonium bromide; and the mass ratio of the Na-montmorillonite to the cationic surfactant is 1:(0.3-0.5).

[0025] Preferably, the organic montmorillonite is modified by a method comprising the following steps:

[0026] Dissolve the zinc salt in water, add organic montmorillonite, ethanol and emulsifier, mix well and adjust the pH value to alkaline, stir and react and age, then centrifuge, wash and dry.

[0027] In the above technical solution, firstly, nano zinc oxide is loaded on the interlayer and surface of organic montmorillonite by the sol-gel method. The vacancy defects on the surface of nano zinc oxide can be tightly combined with the organic functional groups of organic montmorillonite, so that the two have a strong affinity, which can make the nano zinc oxide more evenly dispersed on the surface and interlayer of organic montmorillonite, reducing the agglomeration of nano zinc oxide. The evenly dispersed nano zinc oxide can absorb part of the impact energy through the stress transfer effect, thereby improving the impact resistance of PET; secondly, the surface defects and oxygen vacancies of nano zinc oxide are conducive to capturing and transferring charges, forming conductive pathways, and connecting with other conductive pathways to form an effective conductive network, reducing the accumulation of charges on the surface of PET material, thereby reducing the surface resistance of PET material and improving the anti-static performance; thirdly, nano zinc oxide has an ultraviolet shielding effect, which can reduce the effect of ultraviolet rays on PET and improve the aging resistance of PET.

[0028] Preferably, the emulsifier is polyethylene glycol or polyvinyl alcohol, and the mass ratio of the zinc salt to the organic montmorillonite is 1:(5-10).

[0029] In the above technical solution, according to the embodiment of the present application, the mass ratio of the zinc salt to the organic montmorillonite is more preferably 1:(5-7), and most preferably 1:6.

[0030] A method for preparing an antistatic and impact-resistant PET sheet comprises the following steps:

[0031] Weigh the PET resin and modifier according to the formula, melt mix for 5-10 minutes, heat to 270-285℃, mix evenly, cool and solidify, grind and crush, granulate, extrude and slice.

[0032] By adopting the above technical solution, the modifier is used to modify the PET resin through melt blending, which is a simple process. In addition, the amino group or imino group of the polyaniline in the modifier can form hydrogen bonds with the hydroxyl group, carboxyl group or ester group in the PET molecule, thereby improving the compatibility of the modifier with PET, allowing the modifier to be evenly dispersed in the PET matrix, and improving the performance stability of the PET sheet.

[0033] The above technical solution of the present application has at least the following beneficial effects:

[0034] 1. This application improves the antistatic and impact resistance of PET by designing the modifier into a soft-core hard-shell structure with both toughening and antistatic effects;

[0035] 2. This application improves the interfacial bonding strength between the soft-core POE and the hard-shell polyaniline by grafting modification of the soft-core POE, thereby improving the stress transfer and continuity of the conductive network between the soft core and the hard shell, thereby improving the antistatic and impact resistance of PET;

[0036] 3. This application further improves the antistatic and impact resistance of PET by adding organic montmorillonite and zinc oxide nanoparticles during the preparation of the polyaniline hard shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the microscopic morphology of the antistatic and impact-resistant PET sheets of Comparative Example 1, Example 1, and Example 3;

[0038] Figure 2 1 is the microscopic morphology of the modifiers of Example 1 and Example 3;

[0039] Figure 3 It is the surface resistance of anti-static and impact-resistant PET sheet;

[0040] Figure 4It is the notched impact strength of antistatic and impact-resistant PET sheet. DETAILED DESCRIPTION

[0041] The present application is further described in detail below with reference to the embodiments.

[0042] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are all commercially available.

[0043] Example 1

[0044] The antistatic and impact-resistant PET sheet of this embodiment is composed of the following components in parts by weight: 95 parts of PET resin and 5 parts of modifier;

[0045] The preparation method of the modifier of this embodiment comprises the following steps:

[0046] S1: Weigh 50 g of glycidyl oleate, dissolve it in ethyl acetate, heat it to 60°C, preheat it for 30 min, slowly add 5 g of γ-aminopropyltrimethoxysilane dropwise, heat it to 75°C and react for 5 h, dry it, add 2 g of benzoyl peroxide and 1000 g of POE, mix them evenly, and pour them into a twin-screw extruder for melt grafting. The temperature of the twin-screw extruder is set to 160°C, 170°C, 170°C, 180°C, 180°C, and 180°C, and the screw speed is 100 r / min. The extruded strips are cooled in a water tank and then pelletized to obtain pellets;

[0047] S2: Weigh 100 g of aniline monomer and 150 g of pellets, stir evenly, add 90 g of 5% hydrochloric acid aqueous solution, stir at 50°C for 5 h, then add 250 g of 10% ammonium persulfate aqueous solution dropwise. After the addition is complete, continue stirring for 5 h, let it stand for 6 h, filter the product, and vacuum dry it.

[0048] The method for preparing the antistatic and impact-resistant PET sheet of this embodiment comprises the following steps:

[0049] Weigh 9.5 kg of PET resin and 0.5 kg of modifier respectively, add them into a melt mixer, stir for 5 minutes, heat to 270°C, mix evenly, gradually cool and solidify, grind and crush, granulate with a granulator, and then extrude and slice.

[0050] Example 2

[0051] The antistatic and impact-resistant PET sheet of this embodiment is composed of the following components in parts by weight: 80 parts of PET resin and 20 parts of modifier;

[0052] The preparation method of the modifier of this embodiment comprises the following steps:

[0053] S1: Weigh 30 g of glycidyl linolenate, dissolve it in ethyl acetate, heat it to 60°C, preheat it for 30 min, slowly add dropwise 10.5 g of N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, heat it to 85°C and react for 2 h, dry it, add 10 g of dicumyl peroxide and 1000 g of POE, mix them evenly, and pour them into a twin-screw extruder for melt grafting. The temperature of the twin-screw extruder is set to 170°C, 170°C, 180°C, 190°C, 185°C, and 180°C, and the screw speed is 40 r / min. The extruded strips are cooled in a water tank and then pelletized to obtain pellets;

[0054] S2: Weigh 5 g of organic montmorillonite and 500 g of deionized water, stir at 80°C for 3 h, add 100 g of aniline monomer and 300 g of pellets, stir evenly, add 500 g of a 5% by mass aqueous solution of camphorsulfonic acid, stir at 80°C for 1 h, then add dropwise 500 g of a 10% by mass aqueous solution of potassium persulfate. After the addition is complete, continue stirring for 10 h, let it stand for 12 h, filter the product, and vacuum dry it.

[0055] The preparation method of organic montmorillonite in this embodiment includes the following steps:

[0056] Weigh 25 g of Na-montmorillonite and 500 g of deionized water, stir at 70°C for 6 h, add 7.5 g of dodecyltrimethylammonium bromide, continue stirring for 6 h, filter the mixture, wash with deionized water, and dry to obtain;

[0057] The method for preparing the antistatic and impact-resistant PET sheet of this embodiment comprises the following steps:

[0058] Weigh 8kg of PET resin and 2kg of modifier respectively, add them into a melt mixer, stir for 10 minutes, heat to 285℃, mix evenly, gradually cool and solidify, grind and crush, granulate with a granulator, extrude and shape, and slice.

[0059] Example 3

[0060] The antistatic and impact-resistant PET sheet of this embodiment is composed of the following components in parts by weight: 85 parts of PET resin and 15 parts of modifier;

[0061] The preparation method of the modifier of this embodiment comprises the following steps:

[0062] S1: Weigh 10 g of glycidyl methacrylate, dissolve it in ethyl acetate, heat it to 60°C, preheat it for 30 min, slowly add 2.3 g of diethylenetriaminopropyltrimethoxysilane dropwise, heat it to 80°C and react for 3 h, dry it, add 5 g of dicumyl peroxide and 1000 g of POE, mix them evenly, and pour them into a twin-screw extruder for melt grafting. The temperature of the twin-screw extruder is set to 160°C, 170°C, 180°C, 185°C, 180°C, and 180°C, and the screw speed is 75 r / min. The extruded strips are cooled in a water tank and then pelletized to obtain pellets;

[0063] S2: Weigh 12 g of organic montmorillonite and 1000 g of deionized water, stir at 80°C for 3 h, add 100 g of aniline monomer and 225 g of pellets, stir evenly, add 300 g of 5% sulfuric acid aqueous solution, stir at 70°C for 3 h, then add 350 g of 10% potassium persulfate aqueous solution dropwise, continue stirring for 6 h after the addition is complete, let stand for 12 h, filter the product, and vacuum dry.

[0064] The preparation method of organic montmorillonite in this embodiment includes the following steps:

[0065] Weigh 25 g of Na-montmorillonite and 500 g of deionized water, stir at 90°C for 2 h, add 12.5 g of hexadecyltrimethylammonium bromide, continue stirring for 12 h, filter the mixture, wash with deionized water, and dry to obtain;

[0066] In this embodiment, the organic montmorillonite is modified by a method comprising the following steps:

[0067] Weigh 1 g of zinc nitrate hexahydrate and dissolve it in 50 g of deionized water. Add 6 g of organic montmorillonite, 30 mL of ethanol, and 0.1 g of polyethylene glycol 400. Mix well, then add ammonia water dropwise to adjust the pH to 9. Stir the mixture at room temperature for 3 h, age it for 6 h, centrifuge it, wash it with ethanol, and dry it.

[0068] The method for preparing the antistatic and impact-resistant PET sheet of this embodiment comprises the following steps:

[0069] Weigh 8.5 kg of PET resin and 1.5 kg of modifier respectively, add them into a melt mixer, stir for 10 minutes, heat to 280°C, mix evenly, gradually cool and solidify, grind and crush, granulate with a granulator, and then extrude and slice.

[0070] Comparative Example 1

[0071] The antistatic and impact-resistant PET sheet of this comparative example is composed of the following components in parts by weight: 95 parts of PET resin, 4 parts of POE, and 1 part of antistatic agent;

[0072] The preparation method of the antistatic agent of this comparative example comprises the following steps:

[0073] Weigh 100 g of aniline monomer, add 90 g of 5% hydrochloric acid aqueous solution, stir at 50 ° C for 5 hours, then add 250 g of 10% ammonium persulfate aqueous solution dropwise. After the addition is complete, continue stirring for 5 hours, let it stand for 6 hours, filter the product, and vacuum dry it.

[0074] The preparation method of the antistatic and impact-resistant PET sheet of this comparative example comprises the following steps:

[0075] Weigh 9.5 kg of PET resin, 0.4 kg of POE and 0.1 kg of antistatic agent respectively, add them into a melt mixer, stir for 5 minutes, heat to 270 ° C, mix evenly, gradually cool and solidify, grind and crush, granulate with a granulator, and then extrude and slice.

[0076] Performance testing

[0077] 1. Scanning electron microscopy observation

[0078] The antistatic and impact-resistant PET sheets prepared in Example 1, Example 3 and Comparative Example 1 were observed by scanning electron microscopy. The microscopic morphology thereof is as follows: Figure 1 The modifiers prepared in Example 1 and Example 3 were observed by scanning electron microscopy, and their microscopic morphologies were as shown in FIG. Figure 2 shown.

[0079] 2. Surface resistance test

[0080] The pure PET resin, the antistatic and impact-resistant PET sheets of Examples 1-3 and Comparative Example 1 were dried at 110°C for 12 hours, and then hot-pressed at 280°C to prepare samples with a diameter of 100 mm and a thickness of 0.5 mm. The surface resistance of the samples was tested using a digital high resistance meter. The pure PET resin was used as a blank group for comparison. The test results are shown in FIG. Figure 3 shown.

[0081] 3. Notched impact strength test

[0082] Pure PET resin, antistatic and impact-resistant PET sheets of Examples 1-3 and Comparative Example 1 were placed at 110°C and dried for 12 hours, and injection molded by an injection molding machine at an injection molding temperature of 280°C to prepare notched impact specimens. After the specimens were dried for 12 hours, they were tested according to ASTM D-256. Each group of samples was tested 5 times and the average value was taken. The size of the notched impact specimens was 64×12×3.2 mm. 3 The notch processing radius is 0.25mm, the notch depth is 2.5mm, the angle is 45°, and pure PET resin is used as a blank group for comparison. The test results are as follows Figure 4shown.

[0083] Result Analysis

[0084] from Figure 1 From the comparison, it can be seen that the antistatic and impact-resistant PET sheet of comparative example 1 has poor uniformity because POE has poor compatibility with PET and is easy to agglomerate or phase separate from the PET matrix. After POE is modified, the antistatic and impact-resistant PET sheets of Examples 1 and 3 have better uniformity, indicating that the compatibility of the modifier with the PET matrix is ​​improved.

[0085] from Figure 2 From the comparison, it can be seen that the surface of the modifier of Example 3 is rougher than that of the modifier of Example 1, indicating that organic montmorillonite and nano zinc oxide have been successfully introduced on the basis of the modifier of Example 1, which is very important for improving the antistatic performance and impact resistance of the PET sheet.

[0086] from Figure 3 From the data of Comparative Example 1 and the blank group, it can be seen that after the antistatic agent is added to the PET resin, the surface resistance decreases, indicating that the addition of the antistatic agent is beneficial to improving the antistatic performance of PET, but it may be affected by the poor compatibility, and the antistatic performance is still poor; from the data of Comparative Example 1 and Examples 1-3, it can be seen that the surface resistance of PET has been greatly reduced, indicating that the antistatic performance is improved. This may be because the modifier in Examples 1-3 has good compatibility with PET, and the cationic surfactant, quaternary ammonium salt positive charge and acid-doped polyaniline form a good conductive network, which makes it easier to transfer charge and not easy to accumulate, so the antistatic effect is better.

[0087] from Figure 4 From the data of Comparative Example 1 and the blank group, it can be seen that after POE is added to the PET resin, the notched impact strength is improved, indicating that the addition of POE is beneficial to improving the impact resistance of PET, but it may be affected by poor compatibility and the improvement is limited; from the data of Comparative Example 1 and Examples 1-3, it can be seen that the notched impact strength of the PET sheet is greatly improved. Firstly, this is because the compatibility between the modifier and the PET matrix in Examples 1-3 is good; secondly, this is because the special soft-core and hard-shell structure of the modifier in Examples 1-3, as well as the modification of organic montmorillonite and nano-zinc oxide, are beneficial to improving the impact resistance of the PET sheet.

[0088] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An antistatic and impact-resistant PET sheet, characterized in that: The invention comprises the following components in parts by weight: 80-95 parts of PET resin and 5-20 parts of modifier; the preparation method of the modifier comprises the following steps: S1: dissolving unsaturated glycidyl ester in an organic solvent, preheating, adding aminosiloxane, reacting, drying, adding an oxidant and POE, melt-extruding, cooling, and pelletizing to obtain pellets; S2: Mix aniline and pellets, add acid solution, stir to react, add initiator, continue to react for 5-10 hours, let stand, filter, and vacuum dry.

2. The antistatic and impact-resistant PET sheet according to claim 1, characterized in that: In step S1, the unsaturated glycidyl ester is one or more of glycidyl methacrylate, glycidyl oleate, glycidyl linoleate and glycidyl linolenate; the aminosilicone is one or more of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane and diethylenetriaminopropyltrimethoxysilane; the mass ratio of the unsaturated glycidyl ester to the aminosilicone is 1:(0.1-0.35).

3. The antistatic and impact-resistant PET sheet according to claim 1, characterized in that: In step S1, the oxidant is benzoyl peroxide or dicumyl peroxide; the POE is ethylene-butene copolymer; the mass ratio of the POE, unsaturated glycidyl ester, and oxidant is 1000:(10-50):(2-10).

4. The antistatic and impact-resistant PET sheet according to claim 1, characterized in that: In step S1, the temperature of the melt extrusion is 160-190°C.

5. The antistatic and impact-resistant PET sheet according to claim 1, characterized in that: In step S2, the acid is one or more of hydrochloric acid, sulfuric acid, nitric acid, citric acid and camphorsulfonic acid; the initiator is ammonium persulfate or potassium persulfate; and the mass ratio of the aniline, pellets, acid and initiator is 10:(15-30):(0.45-2.5):(2.5-5).

6. The antistatic and impact-resistant PET sheet according to claim 1, characterized in that: In step S2, organic montmorillonite is further added, and the mass ratio of aniline to organic montmorillonite is 100:(5-12); the organic montmorillonite is prepared by a method comprising the following steps: Mix Na-montmorillonite with water, stir at 70-90°C for 2-6 hours, add cationic surfactant, react for 6-12 hours, filter, wash and dry to obtain the product.

7. The antistatic and impact-resistant PET sheet according to claim 6, characterized in that: The cationic surfactant is one or more of cetyltrimethylammonium bromide, tetradecyltrimethylammonium bromide and dodecyltrimethylammonium bromide; the mass ratio of the Na-montmorillonite to the cationic surfactant is 1:(0.3-0.5).

8. The antistatic and impact-resistant PET sheet according to claim 6, characterized in that: The organic montmorillonite is modified by a method comprising the following steps: Dissolve the zinc salt in water, add organic montmorillonite, ethanol and emulsifier, mix well and adjust the pH value to alkaline, stir and react and age, then centrifuge, wash and dry.

9. The antistatic and impact-resistant PET sheet according to claim 8, characterized in that: The emulsifier is polyethylene glycol or polyvinyl alcohol, and the mass ratio of the zinc salt to the organic montmorillonite is 1:(5-10).

10. A method for preparing the antistatic and impact-resistant PET sheet according to any one of claims 1 to 9, characterized in that: The steps include: Weigh the PET resin and modifier according to the formula, melt mix for 5-10 minutes, heat to 270-285℃, mix evenly, cool and solidify, grind and crush, granulate, extrude and slice.

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