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CN-122013599-A - Environment-friendly waterproof flame-retardant kraft paper for high-performance packaging

CN122013599ACN 122013599 ACN122013599 ACN 122013599ACN-122013599-A

Abstract

The invention discloses environment-friendly waterproof flame-retardant kraft paper for high-performance packaging, and aims to solve the problems of poor waterproof flame retardance, insufficient environment protection and easy damage of mechanical properties of the traditional kraft paper, and can realize double-report of the invention and the invention. The kraft paper comprises base kraft paper, an environment-friendly waterproof layer and an environment-friendly flame-retardant layer, wherein the upper surface and the lower surface of the base kraft paper are sequentially compounded with sulfate wood pulp and bamboo pulp as main raw materials, the environment-friendly waterproof layer is prepared by compounding environment-friendly wax emulsion and other raw materials, the environment-friendly flame-retardant layer is prepared by compounding an inorganic flame retardant and phytic acid, and the preparation process comprises base papermaking, paint preparation and compound molding, and the flow is simple and controllable without complex equipment. The finished product has excellent environmental protection, waterproof flame retardance and mechanical property, the raw materials are biodegradable, the production and use processes are pollution-free to the environment, the production cost is low, and the waterproof flame retardant plastic composite material is suitable for various packaging scenes and has good practical value and large-scale popularization prospect.

Inventors

  • GE XIAOLEI
  • CAO LILI

Assignees

  • 江阴市东梧科技有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (7)

  1. 1. The environment-friendly waterproof flame-retardant kraft paper for high-performance packaging is characterized by comprising base kraft paper (1), wherein an environment-friendly waterproof layer (2) and an environment-friendly flame-retardant layer (3) are sequentially compounded on the upper surface and the lower surface of the base kraft paper (1); the base kraft paper (1) is prepared from the following raw materials, by weight, 60-80 parts of sulfate wood pulp, 15-25 parts of bamboo pulp, 5-10 parts of flax fiber, 3-6 parts of starch adhesive, 1-2 parts of glycerol and 100-120 parts of water; The environment-friendly waterproof layer (2) is prepared from the following raw materials, by weight, 20-30 parts of modified paraffin emulsion, 5-8 parts of chitosan, 3-5 parts of sodium alginate, 2-4 parts of polyethylene glycol and 50-60 parts of deionized water; The environment-friendly flame-retardant layer (3) is prepared from the following raw materials, by weight, 15-20 parts of magnesium hydroxide, 10-15 parts of aluminum hydroxide, 3-5 parts of phytic acid, 5-8 parts of starch, 2-4 parts of polyvinyl acetate emulsion and 40-50 parts of deionized water.
  2. 2. The environment-friendly waterproof flame-retardant kraft paper for high-performance packaging according to claim 1, wherein the coating amount of the environment-friendly waterproof layer (2) is 8-12g/m 2 , and the coating amount of the environment-friendly flame-retardant layer (3) is 10-15g/m 2 .
  3. 3. The environment-friendly waterproof flame-retardant kraft paper for high-performance packaging according to claim 1, wherein the particle size of magnesium hydroxide and aluminum hydroxide in the environment-friendly flame-retardant layer (3) is 100-200 meshes.
  4. 4. The environment-friendly waterproof flame-retardant kraft paper for high-performance packaging according to claim 1, wherein the tensile strength of the kraft paper is more than or equal to 80MPa, the tearing strength is more than or equal to 15N/mm, the water absorption rate is less than or equal to 3.2%, the flame retardant grade reaches 1 grade specified in GB/T2406-2021, and the biodegradation rate for 6 months is more than or equal to 65%.
  5. 5. The environment-friendly waterproof flame-retardant kraft paper for high-performance packaging according to claim 1, wherein the thickness of the base kraft paper (1) is 0.1-0.3mm, the thickness of the environment-friendly waterproof layer (2) is 0.01-0.03mm, and the thickness of the environment-friendly flame-retardant layer (3) is 0.02-0.04mm.
  6. 6. The environment-friendly waterproof flame-retardant kraft paper for high-performance packaging according to claim 1, wherein the modified paraffin wax emulsion is an oxidized polyethylene wax emulsion with a solid content of 30-40%.
  7. 7. A method for preparing the environment-friendly waterproof flame-retardant kraft paper for high-performance packaging according to any one of claims 1 to 6, which is characterized by comprising the following steps: The preparation of the base kraft paper comprises the steps of crushing sulfate wood pulp, bamboo pulp and flax fibers, adding the crushed sulfate wood pulp, bamboo pulp and flax fibers into water, stirring uniformly to prepare paper pulp, adding starch binder and glycerol into the paper pulp, continuously stirring for 20-30 minutes until the starch binder and the glycerol are uniformly mixed, and carrying out papermaking, squeezing, drying and calendaring treatment to prepare the base kraft paper (1); adding chitosan and sodium alginate into deionized water, heating to 50-60 ℃, stirring until the chitosan and the sodium alginate are completely dissolved, adding modified paraffin emulsion and polyethylene glycol, and stirring for 15-20 minutes to obtain the environment-friendly waterproof layer coating; Grinding magnesium hydroxide and aluminum hydroxide to a particle size of 100-200 meshes, adding into deionized water, performing ultrasonic dispersion for 10-15 minutes, adding phytic acid, starch and polyvinyl acetate emulsion, and stirring for 20-25 minutes to obtain the environment-friendly flame-retardant layer coating; the composite molding comprises the steps of uniformly coating the environment-friendly waterproof layer coating on the upper surface and the lower surface of the base kraft paper (1) by a coating process, drying for 10-15 minutes at 80-90 ℃ to form the environment-friendly waterproof layer (2), uniformly coating the environment-friendly flame-retardant layer coating on the outer surface of the environment-friendly waterproof layer (2), drying for 15-20 minutes at 100-110 ℃, cooling, and cutting to obtain the environment-friendly waterproof flame-retardant high-performance kraft paper for packaging.

Description

Environment-friendly waterproof flame-retardant kraft paper for high-performance packaging Technical Field The invention relates to the technical field of packaging materials, in particular to environment-friendly waterproof flame-retardant kraft paper for high-performance packaging. Background Kraft paper is widely used in packaging industry, such as production of paper boxes, paper bags, packaging films and other products, due to its high strength, good toughness and air permeability. However, the traditional kraft paper has obvious performance defects, has strong water absorbability, is easy to soften and damage after meeting water, and causes the reduction of packaging protective performance, meanwhile, the kraft paper belongs to inflammable materials, and has great potential safety hazards if meeting open fire or high-temperature environment in the storage and transportation processes. In order to solve the problems, kraft paper is often modified by adding chemical waterproofing agents and flame retardants in the prior art. However, most chemical reagents have the problem of poor environmental protection, such as fluorine-containing waterproofing agents, halogen flame retardants and the like, are easy to pollute the environment after production, use and discarding, and do not accord with the current development trend of green and environmental protection. In addition, although the kraft paper subjected to partial modification treatment can realize a certain waterproof or flame-retardant effect, mechanical properties such as strength, toughness and the like of the kraft paper can be reduced, the use requirement of high-performance packaging cannot be met, the modification process is complex, the production cost is high, and the large-scale production and popularization are not facilitated. Therefore, the invention provides the environment-friendly waterproof flame-retardant kraft paper for high-performance packaging, so as to solve the problems. Disclosure of Invention Aiming at the defects of the prior art, the invention provides environment-friendly waterproof flame-retardant kraft paper for high-performance packaging, which solves the problems. The environment-friendly waterproof flame-retardant high-performance kraft paper for packaging comprises base kraft paper, wherein an environment-friendly waterproof layer and an environment-friendly flame-retardant layer are sequentially compounded on the upper surface and the lower surface of the base kraft paper. Preferably, the base kraft paper is prepared from the following raw materials, by weight, 60-80 parts of sulfate wood pulp, 15-25 parts of bamboo pulp, 5-10 parts of flax fiber, 3-6 parts of starch adhesive, 1-2 parts of glycerol and 100-120 parts of water; preferably, the environment-friendly waterproof layer is prepared from the following raw materials, by weight, 20-30 parts of modified paraffin emulsion, 5-8 parts of chitosan, 3-5 parts of sodium alginate, 2-4 parts of polyethylene glycol and 50-60 parts of deionized water; Preferably, the environment-friendly flame-retardant layer is prepared from the following raw materials, by weight, 15-20 parts of magnesium hydroxide, 10-15 parts of aluminum hydroxide, 3-5 parts of phytic acid, 5-8 parts of starch, 2-4 parts of polyvinyl acetate emulsion and 40-50 parts of deionized water; Preferably, the thickness of the base kraft paper is 0.1-0.3mm, the thickness of the environment-friendly waterproof layer is 0.01-0.03mm, the thickness of the environment-friendly flame-retardant layer is 0.02-0.04mm, and the solid content of the modified paraffin emulsion is 30-40% and is oxidized polyethylene wax emulsion; the preparation method of the kraft paper comprises the following steps: the preparation of base kraft paper comprises crushing sulfate wood pulp, bamboo pulp and flax fiber, adding into water, stirring to obtain pulp, adding starch binder and glycerol into pulp, stirring for 20-30 min to obtain uniform mixture, and making paper, squeezing, drying, and calendaring to obtain base kraft paper; Adding chitosan and sodium alginate into deionized water, heating to 50-60 ℃ and stirring until the chitosan and the sodium alginate are completely dissolved, adding oxidized polyethylene wax emulsion (solid content is 30-40%) and polyethylene glycol, and stirring for 15-20 minutes to obtain the environment-friendly waterproof layer coating; Grinding magnesium hydroxide and aluminum hydroxide to a particle size of 100-200 meshes, adding into deionized water, performing ultrasonic dispersion for 10-15 minutes, adding phytic acid, starch and polyvinyl acetate emulsion, and stirring for 20-25 minutes to obtain the environment-friendly flame-retardant layer coating; The composite molding comprises the steps of uniformly coating the environment-friendly waterproof layer coating on the upper and lower surfaces of the base kraft paper by a coating process, drying for 10-15 minutes at 80-90 ℃ to form the environment-fri