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CN-121975274-A - Polyester pearlescent master batch, preparation method and application

CN121975274ACN 121975274 ACN121975274 ACN 121975274ACN-121975274-A

Abstract

The invention belongs to the technical field of functional material modification, and relates to a polyester pearlescent master batch, a preparation method and application thereof. The polyester pearlescent master batch is obtained by melt blending and extruding polyester resin, surface coating modified barium sulfate serving as a pearlescent agent and a dispersing agent, wherein the surface of the barium sulfate is subjected to organic coating and/or silicon aluminum coating treatment so as to improve the dispersibility and interfacial compatibility of the barium sulfate in a polyester system. And mixing the obtained polyester pearlescent master batch with matrix polyester resin in proportion, and carrying out extrusion casting and biaxial stretching to obtain the biaxial stretching polyester pearlescent film. Compared with the traditional BOPP pearlescent film and the scheme adopting the calcium carbonate pearlescent agent, the polyester pearlescent master batch and the biaxially oriented polyester pearlescent film have more excellent heat resistance, low temperature resistance and mechanical property, the master batch has excellent filtering property and good dispersibility, the pearlescent effect of the film is stable, and the trial number of times can be reduced through the prediction model, so that the rapid setting of the target light transmittance and stable mass production are realized.

Inventors

  • HE YANLI
  • TAO KANG
  • CHEN JINSONG
  • MA GUANQUN
  • LI JIANHONG

Assignees

  • 福建鹭意新材料科技有限公司
  • 苏州宝丽迪材料科技股份有限公司

Dates

Publication Date
20260505
Application Date
20251217

Claims (10)

  1. 1. A polyester pearlescent master batch is characterized by being prepared by melt blending, by weight, 100 parts of polyester resin, 100-150 parts of barium sulfate serving as a pearlescent agent and 0.25-3.75 parts of a dispersing agent.
  2. 2. The polyester pearlescent masterbatch according to claim 1, wherein the polyester resin is one of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or a combination thereof.
  3. 3. The polyester pearlescent masterbatch according to any one of claims 1-2 wherein the particle size of the barium sulphate is 0.3-3 μm.
  4. 4. The polyester pearlescent masterbatch according to any one of claims 1-3, wherein the barium sulfate is surface-coated modified barium sulfate and the surface coating is one or a combination of organic coating, silica alumina coating.
  5. 5. The polyester pearlescent masterbatch according to any one of claims 1-4 wherein the dispersant is selected from wax dispersants and/or polymeric dispersants selected from one or more of the group consisting of montan wax, polyethylenimine, polyacrylamide, polyvinyl alcohol, polypropylene ether.
  6. 6. A method of preparing the polyester pearlescent masterbatch of any one of claims 1-5 comprising the step of melt blending and extruding the polyester resin, the barium sulfate, and the dispersant; The melt blending extrusion step is carried out in a screw extruder, and the process parameters comprise the main motor rotating speed of 250-350 r/min, the feeding speed of 12-18 kg/h, and the process temperature from the screw inlet to each zone of the extruder die orifice, namely, the temperature of one zone is 260-280 ℃, the temperature of two zones is 260-280 ℃, the temperature of three zones is 260-280 ℃, the temperature of four zones is 240-280 ℃, the temperature of five zones is 240-280 ℃, the temperature of six zones is 180-220 ℃, the temperature of seven zones is 180-220 ℃, the temperature of eight zones is 180-220 ℃, the temperature of nine zones is 180-220 ℃, the temperature of ten zones is 180-220 ℃, the temperature of eleven zones is 200-240 ℃ and the die head temperature is 240-265 ℃.
  7. 7. Use of the polyester pearlescent masterbatch according to any one of claims 1-6 for preparing biaxially oriented polyester pearlescent film, comprising the steps of: (a) Mixing the polyester pearlescent masterbatch with a matrix polyester resin; extruding and casting the mixture obtained in the step (a) to prepare a casting sheet; and (3) carrying out biaxial stretching on the casting sheet to obtain the pearlescent film.
  8. 8. The use according to claim 7, wherein in the step (a), the polyester pearlescent masterbatch is mixed with the matrix polyester resin in such a ratio that the final mass content of barium sulfate in the produced pearlescent film is 15% to 25%.
  9. 9. The use according to claim 8, further comprising the step of predicting or regulating the light transmittance T of the prepared pearlescent film during the production process by the following formula: Wherein T is the predicted light transmittance of the pearlescent film, T poly is the light transmittance of the pure matrix polyester resin film without the pearlescent agent, k and p are coefficients to be fitted, C total is the total mass fraction of the pearlescent agent in the final pearlescent film, C m is the mass fraction of the pearlescent agent in the polyester pearlescent masterbatch, D m is the initial average particle size of the polyester pearlescent masterbatch, and D b is the initial raw material average particle size of the matrix polyester resin.
  10. 10. The use of claim 9, wherein C total is 10% -30%, C m is 50-65%, D m is 2.5-4.0, D b is 4.8-6.0, and k is -0.000001 To-0.00001, and the value range of p is-5.5 to-7.5.

Description

Polyester pearlescent master batch, preparation method and application Technical Field The invention belongs to the technical field of functional material modification, and particularly relates to a polyester pearlescent master batch, a preparation method and application thereof. Background The pearlescent film is widely applied to the packaging field, but the pearlescent film on the market is generally prepared by mixing polypropylene resin, calcium carbonate or pearlescent pigment and then carrying out tape casting and biaxial stretching, namely the BOPP pearlescent film, but the BOPP pearlescent film has no good printing property, and has lower heat resistance, low temperature resistance, antistatic property and thermal shrinkage than BOPET. In addition, the BOPET film has 3-5 times of impact strength in mechanical property compared with BOPP film, and has excellent wear resistance, folding resistance, pinhole resistance and tear resistance. Therefore, a BOPET pearlescent film needs to be developed to replace the existing BOPP pearlescent film so as to improve the performance of the pearlescent film and meet various performance requirements. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a preparation method and application of a polyester pearlescent master batch. A polyester pearlescent master batch is prepared by melt blending, by weight, 100 parts of polyester resin, 100-150 parts of barium sulfate serving as a pearlescent agent and 0.25-3.75 parts of a dispersing agent. The polyester resin is one or a combination of polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). The particle size of the barium sulfate is 0.3-3 mu m. The barium sulfate is modified by surface coating, and the surface coating is one or a combination of organic coating and silicon aluminum coating. The dispersing agent is selected from wax dispersing agent and/or polymer dispersing agent, and the dispersing agent is selected from one or more of montan wax, polyethyleneimine, polyacrylamide, polyvinyl alcohol and polypropylene ether. A method of preparing the polyester pearlescent masterbatch, comprising the step of melt blending and extruding the polyester resin, the barium sulfate and the dispersant. The melt blending extrusion step is carried out in a screw extruder, and the process parameters comprise the main motor rotating speed of 250-350 r/min, the feeding speed of 12-18 kg/h, and the process temperature from the screw inlet to each zone of the extruder die orifice, namely, the temperature of one zone is 260-280 ℃, the temperature of two zones is 260-280 ℃, the temperature of three zones is 260-280 ℃, the temperature of four zones is 240-280 ℃, the temperature of five zones is 240-280 ℃, the temperature of six zones is 180-220 ℃, the temperature of seven zones is 180-220 ℃, the temperature of eight zones is 180-220 ℃, the temperature of nine zones is 180-220 ℃, the temperature of ten zones is 180-220 ℃, the temperature of eleven zones is 200-240 ℃ and the die head temperature is 240-265 ℃. The application of the polyester pearlescent master batch in preparing the biaxially oriented polyester pearlescent film comprises the following steps: (b) Mixing the polyester pearlescent masterbatch with a matrix polyester resin; extruding and casting the mixture obtained in the step (a) to prepare a casting sheet; and (3) carrying out biaxial stretching on the casting sheet to obtain the pearlescent film. In the step (a), the mixing ratio of the polyester pearlescent master batch and the matrix polyester resin is such that the final mass content of the barium sulfate in the prepared pearlescent film is 15% -25%. The method also comprises the step of predicting or regulating the light transmittance T of the prepared pearlescent film in the production process through the following formula: Wherein T is the predicted light transmittance of the pearlescent film, T poly is the light transmittance of the pure matrix polyester resin film without the pearlescent agent, k and p are coefficients to be fitted, C total is the total mass fraction of the pearlescent agent in the final pearlescent film, C m is the mass fraction of the pearlescent agent in the polyester pearlescent masterbatch, D m is the initial average particle size of the polyester pearlescent masterbatch, and D b is the initial raw material average particle size of the matrix polyester resin. The beneficial effects of the invention are as follows: the polyester resin is used as the matrix of the pearlescent master batch and the pearlescent film to replace a polypropylene resin system commonly adopted in the prior art, the biaxially oriented polyester pearlescent film has remarkable advantages in heat resistance, low temperature resistance, dimensional stability and mechanical strength, and the prepared biaxially oriented polyester pearlescent film has higher wear resistance, tear resistance and folding resistance,