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CN-121976429-A - Heat-seal paper bag and preparation method thereof

CN121976429ACN 121976429 ACN121976429 ACN 121976429ACN-121976429-A

Abstract

The invention belongs to the technical field of packaging materials, and provides a heat-seal paper bag and a preparation method thereof, wherein the heat-seal paper bag comprises, by weight, 20-35 parts of ethylene-vinyl acetate copolymer, 8-15 parts of ethylene-acrylic ester copolymer, 3-7 parts of modified magnesium oxide, 2-5 parts of modified silicon dioxide, 1-3 parts of paraffin wax, 1-6 parts of tackifier, 0.5-1.5 parts of plasticizer and 0.2-0.5 part of antioxidant, and a sizing layer coated on the surface of the base paper. Compared with a plastic packaging bag, the heat-seal paper bag provided by the invention has excellent mechanical property and water resistance, also has stronger heat-seal strength, is environment-friendly, can reduce environmental pollution, and has good application prospect.

Inventors

  • FANG XIANG
  • FANG SHUGUANG
  • TAN YUJIE
  • YE MINGLIANG

Assignees

  • 湖南大道新材料有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The heat-seal paper bag comprises base paper and a sizing layer coated on the surface of the base paper, and is characterized by comprising the following raw materials in parts by weight: 20-35 parts of ethylene-vinyl acetate copolymer, 8-15 parts of ethylene-acrylic ester copolymer, 3-7 parts of modified magnesium oxide, 2-5 parts of modified silicon dioxide, 1-3 parts of paraffin wax, 1-6 parts of tackifier, 0.5-1.5 parts of plasticizer and 0.2-0.5 part of antioxidant.
  2. 2. A heat sealed paper bag according to claim 1, wherein the modified silica is prepared by: adding 5.0-5.5g of tridecafluorooctyl triethoxysilane into 90mL of absolute ethyl alcohol and 10mL of deionized water, stirring uniformly, adjusting the pH to 7, heating to 45-50 ℃ and stirring for 3-4h, cooling to room temperature, adding 5.0-5.5g of nano silicon dioxide, washing to neutrality, and drying in vacuum to obtain the modified silicon dioxide.
  3. 3. The heat sealed paper bag of claim 2, wherein the dosage ratio of tridecafluorooctyltriethoxysilane, absolute ethyl alcohol, deionized water and nano-silica is 5.0-5.5g:90ml:10ml:5.0-5.5g.
  4. 4. The heat sealed paper bag according to claim 1, wherein the modified magnesium oxide is prepared by: Adding 10-12g of magnesium oxide into 300mL of absolute ethyl alcohol, dispersing the magnesium oxide to be uniform by ultrasonic, regulating the pH value to 3-4, adding 10-11g of silane coupling agent KH-570, heating to 55-60 ℃, stirring for 22-25h, cooling to room temperature, washing to be neutral, and freeze-drying to obtain the modified magnesium oxide.
  5. 5. The heat-sealed paper bag according to claim 4, wherein the ratio of magnesium oxide, absolute ethyl alcohol and silane coupling agent KH-570 is 10-12 g/300 mL/10-11 g.
  6. 6. The heat sealed paper bag according to claim 1, wherein the tackifier is at least one of rosin resin, maleic anhydride modified rosin resin, terpene resin, and C9 petroleum resin.
  7. 7. The heat sealed paper bag according to claim 1, wherein the plasticizer is at least one of dioctyl terephthalate, diisooctyl adipate, dioctyl sebacate, and ethylene glycol sebacate polyester.
  8. 8. The heat-seal paper bag according to claim 1, wherein the antioxidant is compounded by an antioxidant 1010 and an antioxidant 168 in a mass ratio of 1:1.
  9. 9. The method for producing a heat-sealed paper bag according to claim 1, comprising the steps of: step 1, weighing raw materials of a sizing layer according to parts by weight, heating, stirring and mixing an ethylene-vinyl acetate copolymer, an ethylene-acrylic ester copolymer, modified magnesium oxide, modified silicon dioxide, paraffin, a tackifier, a plasticizer and an antioxidant, uniformly mixing, and filtering to obtain a glue solution; and step 2, carrying out surface sizing on the base paper by using the glue solution, drying, calendaring, cutting and folding to obtain the paper bag.
  10. 10. The method for producing a heat-sealed paper bag according to claim 9, wherein the sizing amount in step 2 is 2-3g/m2.

Description

Heat-seal paper bag and preparation method thereof Technical Field The invention belongs to the technical field of packaging materials, and particularly relates to a heat-seal paper bag and a preparation method thereof. Background The packaging bag becomes daily necessities in life of people by virtue of the advantages of gorgeous color, rich functions, various forms and the like. In general, flexible packages include plastic bags and paper bags. The plastic packaging bag has the advantages of strong corrosion resistance, durability, water resistance, light weight and the like, can effectively isolate oxygen and the like, and has remarkable advantages in the aspects of convenience, benefit and the like. However, as the problem of plastic garbage becomes serious, the plastic is not decomposed for a long time, and the garbage is micro-plasticized in the natural environment, and meanwhile, the problems of difficult classification and recycling, easy combustion, toxic gas generation during combustion and the like exist, so that serious adverse effects are caused on an ecological system. Therefore, a proposal has been made to replace plastic with paper. Although paper bags have good degradability as packaging bags relative to plastic bags, the use of paper instead of plastic still has many technical challenges, such as poor mechanical properties of paper bags, which cause the paper bags to be easily damaged during use, and the paper bags are not heat-sealable, which increases the production cost of the paper bags. The paper bags have poor moisture resistance, are easy to absorb moisture, and have obviously reduced strength once wetted, so that the paper bags are rotted or damaged, and the application of the paper bags is limited due to the problems. Disclosure of Invention The invention aims to provide the heat-seal paper bag with good heat-seal strength, high mechanical property and excellent water resistance and the preparation method thereof, so that the heat-seal paper bag can well replace a plastic bag, and is environment-friendly. The aim of the invention can be achieved by the following technical scheme: The heat-seal paper bag comprises base paper and a sizing layer coated on the surface of the base paper, wherein the raw materials of the sizing layer comprise the following components in parts by weight: 20-35 parts of ethylene-vinyl acetate copolymer, 8-15 parts of ethylene-acrylic ester copolymer, 3-7 parts of modified magnesium oxide, 2-5 parts of modified silicon dioxide, 1-3 parts of paraffin wax, 1-6 parts of tackifier, 0.5-1.5 parts of plasticizer and 0.2-0.5 part of antioxidant. As a further aspect of the present invention, the modified silica is prepared by the steps of: adding 5.0-5.5g of tridecafluorooctyl triethoxysilane into 90mL of absolute ethyl alcohol and 10mL of deionized water, stirring uniformly, adjusting the pH to 7, heating to 45-50 ℃ and stirring for 3-4h, cooling to room temperature, adding 5.0-5.5g of nano silicon dioxide, washing to neutrality, and drying in vacuum to obtain the modified silicon dioxide. By adopting the technical scheme, the nano silicon dioxide is grafted and modified, and the groups generated after the hydrolysis of the tridecyl fluorooctyl triethoxysilane can react with the groups on the surface of the silicon dioxide so as to be tightly combined to obtain the modified silicon dioxide, so that on one hand, the compatibility of the silicon dioxide and a polymer is improved, on the other hand, the modified dioxide particles can form a rough structure on the surface of the composite material, and the surface of the modified silicon dioxide is grafted with the tridecyl fluorooctyl triethoxysilane so as to control the wettability of the composite material, thereby effectively improving the hydrophobicity of the glue applying layer. As a further scheme of the invention, the dosage ratio of the tridecafluorooctyl triethoxysilane, the absolute ethyl alcohol, the deionized water and the nano silicon dioxide is 5.0-5.5g:90mL:10mL:5.0-5.5g. As a further aspect of the present invention, the modified magnesium oxide is prepared by the steps of: Adding 10-12g of magnesium oxide into 300mL of absolute ethyl alcohol, dispersing the magnesium oxide to be uniform by ultrasonic, regulating the pH value to 3-4, adding 10-11g of silane coupling agent KH-570, heating to 55-60 ℃, stirring for 22-25h, cooling to room temperature, washing to be neutral, and freeze-drying to obtain the modified magnesium oxide. By adopting the technical scheme, the magnesium oxide has certain reinforcing and toughening effects on the polymer due to the characteristics of large specific surface area, strong surface activity and the like, and the magnesium oxide is adopted as the filler, so that the peeling strength, mechanical properties and the like of the coating layer can be effectively improved. However, because the compatibility of magnesium oxide and polymer is poor, the magnesium oxide is uneve