Search

CN-122011590-A - Preparation method of high-wear-resistance PP composite material for stationery

CN122011590ACN 122011590 ACN122011590 ACN 122011590ACN-122011590-A

Abstract

The invention discloses a preparation method of a high wear-resistant PP composite material for stationery, which designs the configuration of core-shell composite particles, wherein a coating layer can provide protection during processing, the particles are kept complete, the core layer is prevented from leaking in advance, the binding force between the coating layer and PP components is strong, the shedding phenomenon of the composite particles can be reduced, the coating layer is also helpful for promoting the composite particles to migrate to the surface layer of the material, the wear resistance is better improved, the coating layer is synchronously released when the shearing force is high, a shearing-thermal dual response mechanism is constructed under the cooperation, and an ionic liquid and a latent curing agent are contacted with moisture in the air to polymerize to form a repairing film layer after being released, and the addition of the composite particles is helpful for improving the wear resistance of the PP material.

Inventors

  • YANG SANXIAO

Assignees

  • 浙江韩韵工贸有限公司

Dates

Publication Date
20260512
Application Date
20260320

Claims (8)

  1. 1. The preparation method of the high wear-resistant PP composite material for stationery is characterized by comprising the following steps of: Preparation of first, core-shell composite particles Coating a core by a shell layer, coating a shell layer, taking an ionic liquid and a latent curing agent as the core, taking polyethylene wax as the shell layer and taking ethylene-vinyl acetate copolymer as the shell layer; secondly, mixing the core-shell composite particles with the pp component and the auxiliary agent to prepare the molding composite material.
  2. 2. The method for preparing the high abrasion-resistant PP composite material for stationery according to claim 1, wherein the preparation step of coating the core with the shell layer is characterized by mixing an ionic liquid, a latent curing agent and PE-g-MAH, shearing and stirring at a high speed at 60-70 ℃ for at least 30min to form a core precursor, dispersing hydrophobic nano silicon dioxide in a polyethylene wax solution to form a mother solution, dripping the core precursor into the mother solution, shearing at a high speed at 100-110 ℃ for 10-15min to form a micro-droplet, mixing the polyethylene wax in a molten state with the micro-droplet, shearing and stirring, extruding, granulating under water, and deep-cooling and crushing to obtain the core-type composite particles coated with the shell layer.
  3. 3. The method for preparing the high wear-resistant PP composite material for stationery according to claim 2, wherein the mass ratio of the ionic liquid to the latent curing agent is 8:2-3, the hydrophobic nano silicon dioxide is 0.3-0.8% of the mass of the ionic liquid, and the mass adding ratio of the polyethylene wax to the ionic liquid to the latent curing agent is 6:3-4.
  4. 4. The method for preparing the high-wear-resistance PP composite material for stationery according to claim 2, wherein the coating layer is coated with the coating layer, comprises the steps of modifying core-type composite particles with a silane coupling agent to obtain modified particles, adding the modified particles into a shearing mixer, preheating to 60-70 ℃, melting EVA resin, spraying the molten EVA resin on the core composite particle layer rotating at a high speed through an atomizing nozzle, stopping heating and cooling to solidify EVA on the core-type composite particles to form the coating layer, and sieving to obtain the core-shell composite particles.
  5. 5. The method for preparing the high-wear-resistance PP composite material for stationery according to claim 1, wherein zinc stearate accounting for 0.1% of the mass of the EVA resin is added when the EVA resin is melted, and the mass ratio of the EVA resin to the core type composite particles is 3-2:5.
  6. 6. The method for preparing the PP composite material with high wear resistance for stationery according to claim 1, wherein in the second step, the PP component and the auxiliary agent are mixed and injection molded, wherein parameters during injection molding are as follows, a mold-fixed mold is 60-80 ℃, a movable mold of the mold is 20-30 ℃, a front section is 225-235 ℃, a middle section is 210-220 ℃, a rear section is 190-200 ℃, a nozzle is 230-240 ℃, an injection speed is 40-60mm/s, a pressure maintaining pressure is 40-60MPa, and a pressure maintaining time is 3-5s.
  7. 7. The method for preparing the stationery high wear-resistant PP composite material according to claim 6, wherein the auxiliary agent is a mixture of PP-g-MAH, a nucleating agent and an antioxidant, the PP-g-MAH accounts for 0.3-0.8% of the composite material, the nucleating agent accounts for 0.1-0.2% of the composite material, and the antioxidant accounts for 0.2-0.3% of the composite material.
  8. 8. The method for producing a highly abrasion-resistant PP composite material for stationery according to claim 1, wherein the core-shell composite particles account for 0.6 to 3% by mass of the composite material.

Description

Preparation method of high-wear-resistance PP composite material for stationery Technical Field The invention relates to the technical field of materials, in particular to a preparation method of a high-wear-resistance PP composite material for stationery. Background The stationery is a common tool for students, such as a pen box, a writing case, a ball pen and the like which are used for accommodating, common stationery materials such as PP materials are slightly poor in wear resistance, obvious wear marks are easy to appear after the stationery is used for a long time or rubbed with a large force, the attractiveness is influenced, and the performance requirements of the existing market high-grade stationery are not met. Aiming at the problems, common solutions such as adding inorganic wear-resistant particles, the addition amount of the inorganic wear-resistant particles is larger, other performances of the PP material are easy to influence, and improvement is needed. Disclosure of Invention In order to solve at least one technical defect, the invention provides the following technical scheme: the application discloses a preparation method of a high wear-resistant PP composite material for stationery, which comprises the following steps: Preparation of first, core-shell composite particles Coating a core by a shell layer, coating a shell layer, taking an ionic liquid and a latent curing agent as the core, taking polyethylene wax as the shell layer and taking ethylene-vinyl acetate copolymer as the shell layer; secondly, mixing the core-shell composite particles with the pp component and the auxiliary agent to prepare the molding composite material. Further, the preparation method of the shell-coated core comprises the steps of mixing an ionic liquid and a latent curing agent with PE-g-MAH, shearing and stirring at a high speed at 60-70 ℃ for at least 30min to form a core precursor, dispersing hydrophobic nano silicon dioxide in a polyethylene wax solution to form a mother solution, dripping the core precursor into the mother solution, shearing at a high speed at 100-110 ℃ for 10-15min to form a micro-droplet, mixing the molten polyethylene wax with the micro-droplet, shearing and stirring, extruding, granulating under water, and deep-cooling and crushing to obtain the shell-coated core type composite particles. Further, the mass ratio of the ionic liquid to the latent curing agent is 8:2-3, the hydrophobic nano silicon dioxide is 0.3-0.8% of the mass of the ionic liquid, and the mass adding ratio of the polyethylene wax to the ionic liquid to the latent curing agent is 6:3-4. The preparation method of the coating layer coating shell layer comprises the following steps of modifying core-type composite particles by a silane coupling agent to obtain modified particles, adding the modified particles into a shearing mixer, preheating to 60-70 ℃, melting EVA resin, spraying the EVA resin on the core composite particle layer rotating at a high speed through an atomizing nozzle, stopping heating and cooling to enable the EVA to be solidified on the core-type composite particles to form the coating layer, and screening to obtain the core-shell composite particles. Further, zinc stearate accounting for 0.1% of the mass of the EVA resin is added when the EVA resin is melted, and the mass ratio of the EVA resin to the core type composite particles is 3-2:5. Further, in the second step, the pp component and the auxiliary agent are mixed and injection molded, wherein the parameters during injection molding are as follows, a mold-fixed mold is 60-80 ℃, a mold moving mold is 20-30 ℃, a front section is 225-235 ℃, a middle section is 210-220 ℃, a rear section is 190-200 ℃, a nozzle is 230-240 ℃, the injection speed is 40-60mm/s, the pressure maintaining pressure is 40-60MPa, and the pressure maintaining time is 3-5s. Further, the auxiliary agent is a mixture of PP-g-MAH, a nucleating agent and an antioxidant, the proportion of the PP-g-MAH in the composite material is 0.3-0.8%, the proportion of the nucleating agent in the composite material is 0.1-0.2%, and the proportion of the antioxidant in the composite material is 0.2-0.3% by mass. Further, the core-shell composite particles account for 0.6 to 3 percent of the composite material by mass. Compared with the prior art, the invention has the beneficial effects that: 1. The invention designs the configuration of the core-shell composite particles, wherein the coating layer can provide protection during processing, the particles are kept complete, the core layer is prevented from leaking in advance, the binding force between the coating layer and pp components is strong, the shedding phenomenon of the composite particles can be reduced, the coating layer is also helpful for promoting the composite particles to migrate to the surface layer of the material, the wear resistance is better improved, the shell layer is of a low melting point type, when stationery friction is hi