Search

CN-121975291-A - High-performance flame-retardant weather-resistant smoke-suppression PC composite material and preparation method thereof

CN121975291ACN 121975291 ACN121975291 ACN 121975291ACN-121975291-A

Abstract

The application relates to the technical field of high polymer materials, in particular to a high-performance flame-retardant weather-resistant smoke-suppression PC composite material and a preparation method thereof. The ultraviolet shielding, energy quenching and surface protection weather-proof synergy are realized through siloxane bridging nano titanium dioxide and an organic weather-proof agent, a phosphorus flame retardant is used for providing a flame retardant function through chemical bonding PC, a phosphorus-silicon ceramic layer is formed by the phosphorus flame retardant and polysilicobubalite to strengthen flame retardance, a boron-zinc-molybdenum smoke suppressant is introduced, a glass sealing layer is formed on the basis of catalytic carbonization, and laser engraving smoke is effectively restrained. The components are anchored and crosslinked through an interface to realize functional integration, and finally the PC composite material with flame retardance, weather resistance and smoke suppression is obtained.

Inventors

  • CHEN ZHISHUN
  • LIN ZHIYUAN
  • ZHONG ZIBIN

Assignees

  • 厦门永晋鸿塑胶工业有限公司

Dates

Publication Date
20260505
Application Date
20260210

Claims (10)

  1. 1. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material is characterized by comprising, by weight, 100-110 parts of polycarbonate resin, 5-8 parts of phosphorus flame-retardant synergist, 1-4 parts of silicon flame-retardant synergist, 1.5-4 parts of smoke suppressor, 1-4 parts of opacifier, 0.5-2 parts of weather-resistant agent, 0.2-0.8 part of antioxidant and 0.2-0.5 part of lubricant; The opacifier is nano titanium dioxide grafted with active amino on the surface of siloxane, and the weather-proof agent comprises organic titanate light stabilizer and hydroxyl end-capped polysiloxane.
  2. 2. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material according to claim 1, wherein the organic titanate light stabilizer is diisopropyl di (acetylacetonate) titanate, and the viscosity of the hydroxyl-terminated polysiloxane is 1000-5000 mPa.s.
  3. 3. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material as set forth in claim 1, wherein the phosphorus flame retardant is DOPO with carboxyl introduced into the surface.
  4. 4. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material of claim 1, wherein the silicon flame-retardant synergist is polysilicobuxine.
  5. 5. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material according to claim 1, wherein the smoke suppressing agent is a compound of zinc borate and zinc molybdate, and the mass ratio of the zinc borate to the zinc molybdate is 1:1-4.
  6. 6. The high performance flame retardant weatherable smoke suppressant PC composite of claim 1, wherein said antioxidant comprises one or more of antioxidant 1010 and antioxidant 168.
  7. 7. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material of claim 1, wherein the lubricant comprises one or more of pentaerythritol stearate, ethylene bis-stearamide and montan wax derivatives.
  8. 8. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material as set forth in claim 1, wherein the preparation method of the opacifier comprises the following steps: s1, mixing absolute ethyl alcohol and nano titanium dioxide according to a volume ratio of 4-8:1, and stirring for 30min; S2, mixing 3-aminopropyl triethoxysilane accounting for 2% of TiO 2 with an ethanol solution according to a volume ratio of 1:1-3, and stirring for 5 minutes; S3, mixing the S1 mixture and the S2 mixture, heating to 70-90 ℃, and stirring for 4 hours; and S4, filtering and washing the mixture after stirring in the step S3, and drying in vacuum for 12 hours.
  9. 9. The high-performance flame-retardant weather-resistant smoke-suppressing PC composite material as set forth in claim 3, wherein the preparation method of DOPO with carboxyl introduced into the surface comprises the following steps: s1, adding DOPO and itaconic acid with equal molar ratio into n-propyl ether serving as a solvent, and placing the mixture into a reaction kettle for reaction for 8 hours at 150-170 ℃; s2, placing the S1 mixture after the reaction in a4 ℃ environment, standing for 12 hours, cooling and crystallizing; S3, washing and filtering the S2 mixture after standing, and drying at 80 ℃ for 6h.
  10. 10. The method for preparing the high-performance flame-retardant weather-resistant smoke-suppressing PC composite material according to any one of claims 1 to 9, which is characterized by comprising the following steps: S1, uniformly mixing polycarbonate resin, a phosphorus flame retardant, a silicon flame retardant synergist, a smoke suppressant, a light shielding agent, a weather resistant agent, an antioxidant and a lubricant according to a proportion; s2, melting and blending the mixed raw materials at 220-260 ℃ through a double screw extruder; s3, cooling and granulating to obtain the final granular material.

Description

High-performance flame-retardant weather-resistant smoke-suppression PC composite material and preparation method thereof Technical Field The application relates to the technical field of high polymer materials, in particular to a high-performance flame-retardant weather-resistant smoke-suppression PC composite material and a preparation method thereof. Background Polycarbonate (PC) plates are widely applied to the fields of electronic appliances, automobile parts, building lighting, outdoor equipment and the like due to the excellent performances of high transparency, high impact strength, heat resistance, electric insulation and the like. However, the inherent problems of flammability, easy ultraviolet aging, smoke generated in processing and the like severely restrict the application of the material in high-end scenes. At present, PC materials are low in limiting oxygen index, belong to inflammable materials, and can generate molten dripping during combustion, so that potential safety hazards exist. Traditional flame-retardant modification methods, such as adding brominated flame retardants, are limited due to environmental protection and toxicity problems, and most of common non-halogen phosphorus flame retardants (such as BDP) are physically added, have poor compatibility with a matrix, are easy to migrate and separate out, not only lead to insufficient flame-retardant durability, but also seriously degrade the mechanical properties of materials, in particular the impact strength. Similarly, PC molecular chains are sensitive to uv light and are susceptible to photo-oxidative degradation by long-term outdoor exposure, leading to yellowing, chalking and reduced mechanical properties. Although the polymer can be improved by adding a light stabilizer, the traditional small molecule auxiliary agent also has the problems of easy migration and poor durability. Particularly in flame retardant systems, the interaction between the flame retardant and the weathering agent often results in performance cancellation, which is difficult to cooperate. In addition, in the laser engraving identification process, the PC material is easy to generate a large amount of smoke at the instantaneous high temperature of laser, so that the environment is polluted and equipment is damaged. Therefore, developing a PC composite material which can simultaneously realize high-efficiency flame retardance, super weather resistance, low laser carving smoke and excellent mechanical properties becomes a technical bottleneck in the field which needs to be broken through. Disclosure of Invention The application provides a high-performance flame-retardant weather-resistant smoke-suppressing PC composite material and a preparation method thereof, which are capable of achieving the effects of high-efficiency flame retardance, super weather resistance and low laser carving smoke. The PC composite material comprises, by weight, 100-110 parts of polycarbonate resin, 5-8 parts of phosphorus flame retardants, 1-4 parts of silicon flame retardant synergists, 1.5-4 parts of smoke suppressors, 1-4 parts of opacifiers, 0.5-2 parts of weather-resistant agents, 0.2-0.8 part of antioxidants and 0.2-0.5 part of lubricants; The opacifier is nano titanium dioxide grafted with active amino on the surface of siloxane, and the weather-proof agent comprises organic titanate light stabilizer and hydroxyl end-capped polysiloxane. By adopting the technical scheme, the nano titanium dioxide is used as a key opacifier, and the primary function of the nano titanium dioxide is to provide an excellent ultraviolet shielding function, and a physical defense line against photodegradation is constructed for the material by reflecting and scattering ultraviolet light. In order to solve the problems of easy agglomeration and poor compatibility with an organic matrix, the surface pretreatment of the nano particles is carried out by adopting siloxane with amino groups. The siloxane end group is hydrolyzed and then subjected to condensation reaction with hydroxyl on the surface of titanium dioxide to form a firm Si-O-Ti covalent bond, so that reactive amino groups are successfully introduced on the surface of the siloxane end group, and the amino groups become anchor points for connecting the organic titanate light stabilizer and the hydroxyl-terminated polysiloxane. Further, the flame retardant performance of the polycarbonate resin is improved by the combination of the phosphorus flame retardant and the silicon flame retardant in the components. And the problem of smoke generation of the polycarbonate in laser processing is relieved by the action of the smoke inhibitor. Optionally, the organic titanate light stabilizer is diisopropyl di (acetylacetonate) titanate, and the viscosity of the hydroxyl-terminated polysiloxane is 1000-5000 mPa s. By adopting the above technical scheme, diisopropyl di (acetylacetonate) titanate and hydroxyl-terminated polydimethylsiloxane are subseque