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CN-122011655-A - Tear-resistant low-temperature-resistant PE plastic film and preparation method thereof

CN122011655ACN 122011655 ACN122011655 ACN 122011655ACN-122011655-A

Abstract

The invention relates to the field of plastic films, in particular to a tearing-resistant low-temperature-resistant PE plastic film and a preparation method thereof, which are used for solving the problems that the traditional PE film has obvious defects in the aspects of tearing resistance and low temperature resistance and is limited to be applied in extreme environments; the PE plastic film takes the modified polyethylene as a main raw material, the modified polyethylene is modified from polyethylene, so that the flexibility and toughness of the polyethylene are improved, the PE plastic film can effectively absorb and disperse stress when stressed, the generation and development of cracks are reduced, the tear resistance of the PE plastic film is further effectively improved, the low temperature resistance of the PE plastic film can also be improved, and then modified carbon fiber is added to the PE plastic film, so that the carbon fiber effectively plays a role in enhancing the PE plastic film, the strength and impact resistance of the PE plastic film can be improved, and the mechanical property of the PE plastic film which is still good and stable under a low temperature environment is further improved.

Inventors

  • ZHANG JIANPING
  • CHEN WEIZHI
  • ZHANG HAIYANG

Assignees

  • 汕头市雅仕达包装材料有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. The tearing-resistant low-temperature-resistant PE plastic film is characterized by comprising the following components in parts by weight: 80-90 parts of modified polyethylene, 0.8-4.6 parts of modified carbon fiber, 0.5-2.5 parts of lubricant, 0.3-0.9 part of antioxidant and 0.3-0.5 part of light stabilizer; Wherein the modified polyethylene is prepared by the following steps: Stirring polyethylene, OP-10 emulsifier, deionized water and toluene for reaction, adding isooctyl methacrylate, triallyl cyanurate and benzoyl peroxide, continuously stirring for reaction, cooling the reaction product after the reaction is finished, vacuum-filtering, washing and drying a filter cake, and obtaining the modified polyethylene.
  2. 2. The tear-resistant and low temperature resistant PE plastic film according to claim 1, wherein the polyethylene, the OP-10 emulsifier, deionized water, toluene, isooctyl methacrylate, triallyl cyanurate and benzoyl peroxide are used in an amount ratio of 10g:0.03-0.05g:30-40mL:70-80mL:1-11g:0.8-2.6g:0.2-0.4G, and the polyethylene is LLDPE 2045G.
  3. 3. The tear-resistant and low temperature-resistant PE plastic film according to claim 1, wherein the modified carbon fiber is prepared by the following steps: Step S1, stirring carbon fiber and acetone for reaction, cooling a reaction product after the reaction is finished, performing vacuum suction filtration, washing and drying a filter cake to obtain pretreated carbon fiber; Step S2, stirring the pretreated carbon fiber and deionized water for reaction, then adjusting the pH value by using a sodium hydroxide solution, then adding tris (hydroxymethyl) aminomethane hydrochloride and dopamine hydrochloride for continuous stirring reaction, cooling a reaction product after the reaction is finished, centrifuging, washing and drying a precipitate to obtain the pre-modified carbon fiber; and step 3, stirring the silane coupling agent KH560, acetic acid, absolute ethyl alcohol and deionized water for reaction, then adding the pre-modified carbon fiber for continuous stirring reaction, cooling the reaction product after the reaction is finished, centrifuging, washing and drying the precipitate to obtain the modified carbon fiber.
  4. 4. The tear-resistant and low-temperature-resistant PE plastic film according to claim 3, wherein the dosage ratio of the carbon fiber to the acetone in the step s1 is 2g:25-30mL, and the carbon fiber is T700 carbon fiber with an average length of 5mm.
  5. 5. The tear-resistant and low-temperature-resistant PE plastic film according to claim 3, wherein the dosage ratio of the pretreated carbon fiber, deionized water, tris (hydroxymethyl) aminomethane hydrochloride and dopamine hydrochloride in the step s2 is 3g:70-80mL:0.9-1.1g:0.2-0.3g, and the mass fraction of the sodium hydroxide solution is 20-30%.
  6. 6. The tear-resistant and low temperature-resistant PE plastic film according to claim 3, wherein the silane coupling agent KH560, acetic acid, absolute ethyl alcohol and deionized water in the step s3 are used in a ratio of 1-5mL to 1-2mL to 80-90mL to 10-15mL.
  7. 7. A method for preparing a tear-resistant and low temperature resistant PE plastic film according to any one of claims 1 to 6, comprising the steps of: Weighing 80-90 parts of modified polyethylene, 0.8-4.6 parts of modified carbon fiber, 0.5-2.5 parts of lubricant, 0.3-0.9 part of antioxidant and 0.3-0.5 part of light stabilizer according to parts by weight for standby; adding the modified polyethylene, the modified carbon fiber, the lubricant, the antioxidant and the light stabilizer into a high-speed mixer, and stirring and mixing for 20-30min under the conditions of 70-80 ℃ and stirring speed of 800-1200r/min to obtain a mixture; Adding the mixture into a double-screw extruder, melting and blending under the conditions of 160 ℃ in a first area, 175 ℃ in a second area, 185 ℃ in a third area, 190 ℃ in a fourth area, 185 ℃ in a fifth area, 180 ℃ in a die head and 100-200r/min of screw rotating speed, and performing blow molding by a film blowing machine to obtain the tearing-resistant low-temperature-resistant PE plastic film with the thickness of 30 mu m.
  8. 8. The method for preparing a tear-resistant and low temperature resistant PE plastic film according to claim 7, wherein the lubricant is calcium stearate.
  9. 9. The method for preparing a tear-resistant and low temperature resistant PE plastic film according to claim 7, wherein the antioxidant is antioxidant 1010.
  10. 10. The method for producing a tear-resistant and low temperature resistant PE plastic film according to claim 7, wherein the light stabilizer is a light stabilizer 119.

Description

Tear-resistant low-temperature-resistant PE plastic film and preparation method thereof Technical Field The invention relates to the field of plastic films, in particular to a tearing-resistant low-temperature-resistant PE plastic film and a preparation method thereof. Background Polyethylene (PE) plastic films are widely used in packaging, agriculture and other fields due to their excellent processability, good chemical stability and lower cost. In the packaging industry, PE films are widely used as packaging materials for foods, medicines and daily necessities, and the light weight and barrier properties of the PE films effectively prolong the shelf life of the products and reduce the transportation cost. However, the conventional PE film has significant disadvantages in tear and low temperature resistance, is easily fragile in low temperature environments, has reduced flexibility, and has significantly deteriorated impact strength and tear strength, which limits its application in extreme environments. Therefore, development of the tearing-resistant low-temperature-resistant PE plastic film and the preparation method thereof have important significance. Disclosure of Invention In order to overcome the technical problems, the invention aims to provide the tearing-resistant low-temperature-resistant PE plastic film and the preparation method thereof, which solve the problems that the traditional PE film has obvious defects in the aspects of tearing resistance and low temperature resistance and is limited to be applied in extreme environments. The aim of the invention can be achieved by the following technical scheme: In a first aspect, the application provides a tearing-resistant low-temperature-resistant PE plastic film, which comprises the following components in parts by weight: 80-90 parts of modified polyethylene, 0.8-4.6 parts of modified carbon fiber, 0.5-2.5 parts of lubricant, 0.3-0.9 part of antioxidant and 0.3-0.5 part of light stabilizer; Wherein the modified polyethylene is prepared by the following steps: Adding polyethylene, OP-10 emulsifier, deionized water and toluene into a three-neck flask provided with a stirrer, a thermometer and an air duct, introducing nitrogen for protection, stirring and reacting for 10-20min under the conditions of 20-25 ℃ and stirring speed of 200-300r/min, heating to 70-75 ℃ and continuing stirring and reacting for 30-40min, adding isooctyl methacrylate, triallyl cyanurate and benzoyl peroxide and continuing stirring and reacting for 2-4h under the conditions of heating to 80-90 ℃, cooling the reaction product to room temperature after the reaction is finished, vacuum filtering, washing a filter cake with acetone for 2-3 times, and then placing in a vacuum drying box and drying for 2-3h under the conditions of 50-60 ℃ to obtain the modified polyethylene. As a preferred embodiment of the invention, the dosage ratio of polyethylene, OP-10 emulsifier, deionized water, toluene, isooctyl methacrylate, triallyl cyanurate and benzoyl peroxide is 10g:0.03-0.05g:30-40mL:70-80mL:1-11g:0.8-2.6g:0.2-0.4g. As a preferred embodiment of the present invention, the polyethylene is LLDPE 2045G. As a preferred embodiment of the present invention, the modified carbon fiber is prepared by the steps of: Step S1, adding carbon fiber and acetone into a three-neck flask provided with a stirrer, a thermometer and an air duct, introducing nitrogen for protection, stirring and reacting for 10-20min under the conditions of 20-25 ℃ and stirring speed of 200-300r/min, heating to 60-70 ℃ and continuously stirring and reacting for 2-4h, cooling a reaction product to room temperature after the reaction is finished, performing vacuum suction filtration, washing a filter cake with ethanol and deionized water for 2-3 times, and then placing the filter cake in a vacuum drying oven, and drying for 2-3h under the conditions of 80-90 ℃ to obtain pretreated carbon fiber; Step 2, adding pretreated carbon fiber and deionized water into a three-neck flask provided with a stirrer, a thermometer and an air duct, introducing nitrogen for protection, stirring and reacting for 20-30min under the conditions of 10-15 ℃ and stirring speed of 200-300r/min, then adjusting pH to 8.5-9 by using sodium hydroxide solution, heating to 40-45 ℃ and adding tris (hydroxymethyl) aminomethane hydrochloride and dopamine hydrochloride for continuous stirring and reacting for 5-6h, cooling the reaction product to room temperature after the reaction is finished, centrifuging, washing the precipitate with distilled water for 2-3 times, and then placing in a vacuum drying oven, and drying for 2-3h under the conditions of 70-80 ℃ to obtain the pre-modified carbon fiber; Step 3, adding a silane coupling agent KH560, acetic acid, absolute ethyl alcohol and deionized water into a three-neck flask provided with a stirrer, a thermometer and an air duct, introducing nitrogen for protection, stirring and reacting for 30-40min under the cond