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CN-121975283-A - PET composite master batch and preparation method and application thereof

CN121975283ACN 121975283 ACN121975283 ACN 121975283ACN-121975283-A

Abstract

The invention relates to a PET composite master batch, a preparation method and application thereof, and relates to the field of PET composite master batch preparation. The PET composite master batch comprises, by weight, 65-75 parts of PET resin, 20-30 parts of TPEE, 3-5 parts of MBS resin, 4-8 parts of nucleating agent, 2-5 parts of lubricant, 0.3-0.6 part of chain extender and 0.2-0.5 part of antioxidant. The invention realizes the synergy of the PET resin, the TPEE and the MBS resin by limiting the specific weight proportion of the PET resin, the TPEE and the MBS resin, and finally ensures that the PET composite master batch has excellent heat resistance, impact resistance and transparency, and solves the technical problem that the existing PET material is difficult to balance the three simultaneously.

Inventors

  • ZHAO CHENYUE
  • Qian Jinghai
  • LING FENG
  • PU XINMING
  • HUANG SHIYI
  • YANG LIPING

Assignees

  • 万凯新材料股份有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The PET composite master batch is characterized by comprising, by weight, 65-75 parts of PET resin, 20-30 parts of TPEE, 3-5 parts of MBS resin, 4-8 parts of nucleating agent, 2-5 parts of lubricant, 0.3-0.6 part of chain extender and 0.2-0.5 part of antioxidant.
  2. 2. The PET composite master batch according to claim 1, wherein the nucleating agent comprises an inorganic nucleating agent and a Surlyn nucleating agent in a mass ratio of (3-6) (1-2), the inorganic nucleating agent comprises nano silicon dioxide, and the Surlyn nucleating agent comprises at least one of Surlyn 8920, surlyn 8940 and Surlyn 8945.
  3. 3. The PET composite master batch according to claim 2, wherein the nano silicon dioxide is subjected to surface modification by a silane coupling agent KH560, and the grafting rate of the modifier is 3-8%.
  4. 4. The PET composite master batch of claim 1, wherein the antioxidant comprises at least one of antioxidant 1010, antioxidant 1076, antioxidant 1315, antioxidant 168, antioxidant 618, and/or, The lubricant comprises pentaerythritol stearate or stearyl stearate, and/or The mass ratio of the core shell of the MBS resin is (60-70): 30-40), and/or The chain extender comprises an epoxy type chain extender.
  5. 5. The PET composite masterbatch according to claim 4, wherein the epoxy chain extender comprises ADR4400.
  6. 6. The PET composite master batch according to any one of claims 1 to 5, wherein the intrinsic viscosity of the PET resin is >0.78dL/g, and the Shore hardness of the TPEE is D50-D60.
  7. 7. A preparation method of a PET composite master batch, which is applied to the PET composite master batch of any one of claims 1-6, and is characterized by comprising the following steps: Weighing the components according to the proportion of the PET composite master batch according to any one of claims 1-6; Drying the PET resin to obtain dried PET resin; Mixing the dried PET resin, the TPEE, the MBS resin, the lubricant, the nucleating agent, the chain extender and the antioxidant to obtain a mixture; granulating the mixture to obtain the PET composite master batch for the target.
  8. 8. The method for producing a PET composite master batch according to claim 7, wherein in the step of drying the PET resin, the drying is performed at 140 to 160 ℃ for 4 to 6 hours; Mixing the dried PET resin, the TPEE, the MBS resin, the lubricant, the nucleating agent, the chain extender and the antioxidant at a stirring rotation speed of 300-500 rpm; during granulation of the mixture, the feed section screw temperature was 210-230 ℃, the melt section screw temperature was 260-290 ℃, and the homogenization section screw temperature was 275-285 ℃.
  9. 9. The PET composite master batch disclosed in any one of claims 1 to 6 or the PET composite master batch prepared by the method disclosed in any one of claims 7 to 8 is applied to preparation of PET lamp shade composite materials with strong heat resistance, excellent impact resistance and high transparency.
  10. 10. A PET lamp shade composite material is characterized by comprising the following components, by mass, 10-30% of the PET composite master batch according to any one of claims 1-5 and 70-90% of PET resin.

Description

PET composite master batch and preparation method and application thereof Technical Field The invention relates to the field of PET composite master batch preparation, in particular to a PET composite master batch, a preparation method and application thereof. Background The lamp shade is the protection accessory of light, except playing physical protection effect, can also make light dizzy through modes such as surface treatment, promotion haze. General-purpose polystyrene (GPPS) is a common lampshade material, and has good transparency, high heat distortion temperature, good rigidity, poor toughness and easy fracture and damage in the loading and unloading process. To solve this problem, polyethylene terephthalate (PET) may be used as a lamp cover material. PET is a polymer resin material with wide application fields, has excellent comprehensive mechanical properties, low price, good toughness and transparency, and can be recycled through degradation, but has poor heat resistance, thermal deformation temperature of only 70 ℃, and is easy to have the problems of difficult demolding and gate fracture. Accordingly, the conventional technology is in need of improvement. Disclosure of Invention Aiming at the technical problems, the invention aims to provide a PET composite master batch, a preparation method and application thereof, which are used for overcoming the defects of poor heat resistance and poor toughness. In order to achieve the aim, in a first aspect, the invention provides a PET composite master batch, which comprises, by weight, 65-75 parts of PET resin, 20-30 parts of TPEE, 3-5 parts of MBS resin, 4-8 parts of nucleating agent, 2-5 parts of lubricant, 0.3-0.6 part of chain extender and 0.2-0.5 part of antioxidant. Compared with the prior art, the invention realizes the synergy of the PET resin, the TPEE and the MBS resin by limiting the specific weight ratio of the PET resin, the TPEE and the MBS resin, wherein the TPEE is used as an elastomer component to play a core toughening effect, the soft section in the molecular chain can absorb impact energy, the impact resistance of the PET material is obviously improved, the MBS resin is used as a compatilizer, the interfacial bonding force of the PET and the TPEE is effectively improved by virtue of the characteristics of the affinity of a shell layer in a core-shell structure and the PET resin and the compatibility of the core layer and the TPEE, the two-phase separation is avoided, the transparency of the material is ensured, and particularly, the TPEE is strictly limited in a specific range of 10-35 parts, the TPEE can form a stable microstructure with the PET, the heat resistance of the material is greatly improved by molecular chain entanglement and crystallization regulation, once the TPEE ratio exceeds the range (the toughening and the heat resistance is insufficient, the crystallization order of the PET is destroyed if the temperature is higher than 35 parts), the heat resistance of the material is sharply reduced, and the reasonable ratio of the nucleating agent, the lubricant, the chain extender and the antioxidant is further assisted to optimize the final processing performance and the comprehensive processing performance and the transparency of the PET material are difficult to solve the problem of the prior art. Further, the nucleating agent comprises an inorganic nucleating agent and a Surlyn nucleating agent in a mass ratio of (3-6) (1-2), wherein the inorganic nucleating agent comprises nano silicon dioxide, and the Surlyn nucleating agent comprises at least one of Surlyn 8920, surlyn 8940 and Surlyn 8945. Compared with the prior art, the invention further optimizes the transparency and the heat resistance by limiting the nucleating agent to a compound system of nano silicon dioxide (inorganic nucleating agent) and Surlyn nucleating agent in mass ratio (1-2), wherein the nano silicon dioxide can provide a large amount of heterogeneous nucleation sites for PET crystallization by virtue of the high specific surface area of nano size, refine the crystal size, avoid scattering of large crystal grains on light, improve the transparency of the material, the Surlyn nucleating agent is used as an ionic polymer, has good compatibility with PET resin, can regulate and control the crystallization rate and the crystallinity of PET, further enhances the heat resistance and the mechanical stability of the material on the premise of not damaging a PET-TPEE-MBS synergistic system, and the specific proportion of the two ensures the balance of the nucleation efficiency and the compatibility, thereby not only avoiding the reduction of the transparency caused by uneven dispersion of a single inorganic nucleating agent, but also avoiding the limited improvement of the heat resistance by a single Surlyn nucleating agent, and finally ensuring the excellent stability and the synergistic optimization of the heat resistance. Further, the nano silicon dioxide i