Search

CN-121975242-A - Injection molding-based light-weight plastic package for household appliances and preparation process thereof

CN121975242ACN 121975242 ACN121975242 ACN 121975242ACN-121975242-A

Abstract

The invention belongs to the technical field of packaging materials, and particularly relates to a lightweight plastic packaging piece for household appliances based on injection molding and a preparation process thereof. The plastic package for the light household appliances based on injection molding comprises, by mass, 1 (0.3-0.4) of light 303 EPS resin and self-made EPS resin, wherein the self-made EPS resin comprises, by mass, 100 parts of styrene, 0.1-0.5 part of a nucleating agent, 125-135 parts of water, 0.2-0.5 part of an initiator, 0.2-0.5 part of a mixed salt, 5-8 parts of a modified inorganic flame retardant, 0.001-0.002 part of a surfactant and 6-8 parts of a foaming agent. The package of the present invention can have excellent compressive strength, tensile strength, aging resistance and flame retardancy at the same time.

Inventors

  • YI XINRONG
  • LI ZAIYONG

Assignees

  • 青岛新海景包装制品有限公司

Dates

Publication Date
20260505
Application Date
20260226

Claims (10)

  1. 1. The plastic package for the light household appliances based on injection molding is characterized in that the package comprises, by mass, (0.3-0.4) 1 of EPS resin with the model of light 303 and self-made EPS resin, wherein the self-made EPS resin comprises, by mass, 100 parts of styrene, 0.1-0.5 part of nucleating agent, 125-135 parts of water, 0.2-0.5 part of initiator, 0.2-0.5 part of mixed salt, 5-8 parts of modified inorganic flame retardant, 0.001-0.002 part of surfactant and 6-8 parts of foaming agent, and the modified inorganic flame retardant is prepared by modifying the inorganic flame retardant by sequentially using a styrene-maleic anhydride copolymer and dodecyl trimethoxysilane.
  2. 2. The plastic package for lightweight household electrical appliances based on injection molding according to claim 1, wherein the preparation method of the modified inorganic flame retardant comprises the following steps: (1) Adding absolute ethyl alcohol into an inorganic flame retardant to obtain an inorganic flame retardant ethanol suspension, dissolving a styrene-maleic anhydride copolymer in tetrahydrofuran to obtain a solution, dripping the solution into the inorganic flame retardant ethanol suspension, heating for reaction, naturally cooling to room temperature after the reaction is finished, performing suction filtration, washing and drying to obtain a pre-modified flame retardant; (2) Mixing dodecyl trimethoxy silane, absolute ethyl alcohol and deionized water, regulating the pH value by using glacial acetic acid to obtain silane hydrolysate, adding the pre-modified flame retardant prepared in the step (1) into the silane hydrolysate, heating for reaction, cooling, filtering, washing and drying to obtain the modified inorganic flame retardant.
  3. 3. The plastic package for lightweight household appliances based on injection molding according to claim 2, wherein the inorganic flame retardant comprises magnesium hydroxide and aluminum hydroxide in a mass ratio of (2-2.5): 1.
  4. 4. The plastic package for lightweight household electrical appliances based on injection molding according to claim 3, wherein the magnesium hydroxide has a particle size ranging from 25 to 80nm, an average particle size of 50nm, and an average specific surface area of 80m 2 /g.
  5. 5. The plastic package for lightweight household electrical appliances based on injection molding according to claim 3, wherein the aluminum hydroxide has a particle size ranging from 8 to 47nm, an average particle size of 20nm, and an average specific surface area of 216m 2 /g.
  6. 6. The plastic package for lightweight household appliances based on injection molding according to claim 1, wherein the preparation method of the self-made EPS resin comprises the steps of: (1) Adding styrene, a nucleating agent, an initiator and a modified inorganic flame retardant into a reaction kettle, stirring, adding water, mixed salt and a surfactant, stirring, heating to 70-72 ℃ for heat preservation, continuously heating to 84-85 ℃ for heat preservation, and heating to 90-92 ℃ for heat preservation to obtain a mixture; (2) Charging nitrogen into the reaction kettle, adding a foaming agent, heating to 110-120 ℃, preserving heat, cooling to room temperature, drying, and screening EPS resin beads with the particle size range of 0.5-0.7mm to obtain self-made EPS resin.
  7. 7. The plastic package for lightweight household appliances based on injection molding according to claim 1, wherein the foaming agent comprises isopentane and n-pentane in a mass ratio of 1 (2-2.3).
  8. 8. The plastic package for lightweight household appliances based on injection molding according to claim 1, wherein the mixed salt comprises magnesium phosphate, calcium phosphate and sodium bisulphite in a mass ratio of (4-6): (9-11): 1.
  9. 9. The plastic package for lightweight household appliances based on injection molding according to claim 1, wherein the surfactant is sodium dodecylbenzenesulfonate.
  10. 10. A process for preparing a plastic package for lightweight household appliances based on injection molding as claimed in any one of claims 1 to 9, characterized by comprising the steps of: uniformly mixing EPS resin with a model of light grade 303 and self-made EPS resin, introducing saturated steam to saturate for heating, and performing primary expansion to obtain pre-expanded beads; Step two, conveying the pre-expanded beads to a curing bin through wind power, and standing at room temperature to obtain cured beads; Filling the cured beads into a closed mold cavity, introducing high-temperature steam, performing secondary expansion, cooling, opening the mold, taking out the product, drying, and removing flash to obtain the plastic package for the lightweight household appliance based on injection molding.

Description

Injection molding-based light-weight plastic package for household appliances and preparation process thereof Technical Field The invention belongs to the technical field of packaging materials, and particularly relates to a lightweight plastic packaging piece for household appliances based on injection molding and a preparation process thereof. Background With rapid iteration of the household appliance industry in the direction of light weight, energy saving and green, the performance requirements of plastic packages for household appliances are becoming more stringent. The injection molding process has the advantages of high molding efficiency, high product size precision, capability of realizing integrated molding of complex structures and the like, and is widely applied to the field of household appliance packaging. Expandable Polystyrene (EPS) has become one of the most widely used cushioning packaging materials in the household appliance industry due to the outstanding advantages of light weight, excellent cushioning and shock absorption, convenient molding and processing, low cost and the like, and is widely used for transportation, storage and packaging of various household appliances such as refrigerators, washing machines, air conditioners, small household appliances and the like. Chinese patent CN116622116B discloses a flame-retardant expandable polystyrene and a preparation method thereof, wherein the product powder and massive materials prepared by the invention are less, the mechanical properties are excellent after the polystyrene board is prepared, and the phenomena of foam collapse, deformation and the like still do not occur after the polystyrene board is placed for one week or even one month. However, in the scheme, a brominated flame retardant (methyl octabromoether) is used, and the methyl octabromoether is a typical halogenated flame retardant, so that hydrogen bromide toxic gas is released during combustion, the environment-friendly compliance is poor, the use safety of packaging is affected, and if open fire is encountered in logistics transportation and storage of the packaging material, the diffusion of toxic smoke is aggravated, so that the low-smoke and low-toxicity safety requirement of the packaging material is not met. Meanwhile, the compressive strength and the tensile strength of the package prepared from the expandable polystyrene are insufficient, and the use safety of the package is seriously affected. Therefore, there is a need for a packaging material having good environmental protection, flame retardancy and excellent mechanical properties. Disclosure of Invention The invention aims to provide a plastic package for light household appliances based on injection molding and a preparation process thereof, which can simultaneously improve the compression strength, tensile strength, ageing resistance and flame retardance of the package. In order to achieve the above object, the present invention provides the following technical solutions: The plastic package for the light household appliances based on injection molding comprises 100 parts of styrene, 0.1-0.5 part of nucleating agent, 125-135 parts of water, 0.2-0.5 part of initiator, 0.2-0.5 part of mixed salt, 5-8 parts of modified inorganic flame retardant, 0.001-0.002 part of surfactant and 6-8 parts of foaming agent, wherein the self-made EPS resin comprises the following components in parts by weight, and the modified inorganic flame retardant is prepared by sequentially using a styrene-maleic anhydride copolymer and dodecyl trimethoxy silane. Preferably, the preparation method of the modified inorganic flame retardant comprises the following steps: (1) Adding absolute ethyl alcohol into an inorganic flame retardant to obtain an inorganic flame retardant ethanol suspension, dissolving a styrene-maleic anhydride copolymer in tetrahydrofuran to obtain a solution, dripping the solution into the inorganic flame retardant ethanol suspension, heating for reaction, naturally cooling to room temperature after the reaction is finished, performing suction filtration, washing and drying to obtain a pre-modified flame retardant; (2) Mixing dodecyl trimethoxy silane, absolute ethyl alcohol and deionized water, regulating the pH value by using glacial acetic acid to obtain silane hydrolysate, adding the pre-modified flame retardant prepared in the step (1) into the silane hydrolysate, heating for reaction, cooling, filtering, washing and drying to obtain the modified inorganic flame retardant. In the prior art, a brominated flame retardant (methyl octabromoether) is used, so that hydrogen bromide toxic gas is released during combustion, and the environment-friendly compliance is poor. The inorganic flame retardant has the advantages of environmental protection, low smoke and no toxicity, but the compatibility and dispersibility of the inorganic flame retardant with styrene are poor when the inorganic flame retardant is directly adde