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CN-122011936-A - Release agent preparation method and release agent

CN122011936ACN 122011936 ACN122011936 ACN 122011936ACN-122011936-A

Abstract

The invention relates to the technical field of organic silicon materials. The invention discloses a preparation method of a release agent and the release agent, which comprises the steps of weighing main organic silicon resin, a cross-linking agent, a catalyst, an adhesion promoter, a leveling agent, a heat-resistant stabilizer and a mixed solvent according to weight percentage, adding the main organic silicon resin and part of the mixed solvent into a reaction kettle, stirring to obtain a premix, adding the cross-linking agent and the adhesion promoter into the premix, heating, stirring, adding the catalyst, stirring to form a modified organic silicon prepolymer, adding the leveling agent and the heat-resistant stabilizer into the prepolymer, performing ultrasonic dispersion, heating and pre-curing the mixed system in a segmented mode, adding the rest of the mixed solvent, regulating the solid content, and filtering to obtain a release agent finished product. According to the release agent, the modified polysiloxane main body is matched with the compound auxiliary agent, so that the interface binding force with the PET base film, the heat-resistant stability and the coating uniformity are improved. The preparation process is adapted to conventional equipment, and the product batch stability is ensured by sectional pre-curing and ultrasonic dispersion.

Inventors

  • Cheng Jiechi

Assignees

  • 天宫光电科技(嘉兴)有限公司

Dates

Publication Date
20260512
Application Date
20260311

Claims (10)

  1. 1. The preparation method of the parting agent is characterized by comprising the following steps: weighing the raw materials, namely weighing main organic silicon resin, a cross-linking agent, a catalyst, an adhesion promoter, a leveling agent, a heat-resistant stabilizer and a mixed solvent according to weight percentage; Adding the main organic silicon resin and part of the mixed solvent into a reaction kettle, and stirring to obtain a premix; the construction of a modified crosslinking system, namely adding a crosslinking agent and an adhesion promoter into the premix, heating and stirring, and then adding a catalyst for continuous stirring to form a modified organosilicon prepolymer; compounding a functional auxiliary agent, namely adding a flatting agent and a heat resistant stabilizer into the modified organosilicon prepolymer, and performing ultrasonic dispersion; and (3) pre-curing treatment, namely carrying out sectional heating pretreatment on the obtained mixed system, then adding the rest mixed solvent to adjust the solid content, and filtering to obtain a release agent finished product.
  2. 2. The method for preparing a release agent according to claim 1, wherein: The main organic silicon resin is modified polysiloxane containing vinyl and phenyl, the molecular weight is 5000-15000, the phenyl molar content is 10-30%, the viscosity at 25 ℃ is 500-2000 mPas, and the vinyl mass content is 0.5-2wt%.
  3. 3. The method for preparing a release agent according to claim 2, wherein: Based on the total weight of the raw materials, the weight percentages of the components are as follows: 40-58wt% of main organic silicon resin; 28-45wt% of mixed solvent; 2-8wt% of cross-linking agent; 1-6wt% of adhesion promoter; 0.5-3wt% of heat stabilizer; 0.1-3wt% of leveling agent; 0.1-2wt% of catalyst; And the sum of the contents of the components is 100wt%.
  4. 4. The method for preparing a release agent according to claim 1, wherein: The cross-linking agent is at least one of hydrogen silicone oil, tetraethoxysilane and methyltrimethoxysilane; when the cross-linking agent is hydrogen-containing silicone oil, the hydrogen content is 0.5-1.5wt% and the viscosity at 25 ℃ is 100-500 mPa.s.
  5. 5. The method for preparing a release agent according to claim 1, wherein: the catalyst is a platinum catalyst or an organotin compound; The platinum catalyst has platinum content of 500-2000ppm and additive amount of 0.1-0.5wt% and the organic tin compound is at least one selected from dibutyl tin dilaurate and stannous octoate and has additive amount of 0.5-2wt%.
  6. 6. The method for preparing a release agent according to claim 1, wherein: the adhesion promoter is a compound of an epoxy silane coupling agent and an amino silane coupling agent, and the mass ratio of the epoxy silane coupling agent to the amino silane coupling agent is 1:1-3:1; The leveling agent is polyether modified polysiloxane.
  7. 7. The method for preparing a release agent according to claim 1, wherein: The heat stabilizer is a compound of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and phosphite antioxidants, and the mass ratio of the pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate to the phosphite antioxidants is 1:1-2:1.
  8. 8. The method for preparing a release agent according to claim 1, wherein: The technological parameters of premixing and dispersing are that mixed solvent with the dosage of 50-70% is added, the stirring speed is 300-600r/min, the temperature is 40-60 ℃, and the stirring time is 20-40min; The ultrasonic dispersion power is 200-400W, the frequency is 20-40kHz, and the ultrasonic time is 15-25min; the pre-curing treatment process comprises treating at 40-50deg.C for 1-2 hr, and heating to 50-60deg.C for 1-4 hr; The filtering precision of the filtering is less than or equal to 5 mu m; the solid content of the finished release agent is 15-30%, and the viscosity at 25 ℃ is 80-150 mPa.s.
  9. 9. A mold release agent, comprising: a process according to any one of claims 1 to 8.
  10. 10. A mold release according to claim 9, wherein: after the release agent forms a dry film on the PET base film, the interface bonding strength of the release agent and the base film is more than or equal to 1.5N/25mm.

Description

Release agent preparation method and release agent Technical Field The invention relates to the technical field of organic silicon materials, in particular to a release agent preparation method and a release agent. Background The release agent is a functional material coated on the surface of the base film and is widely applied to a plurality of fields such as gold stamping foil, self-adhesive labels, flexible circuit boards and the like. The release agent for the polyester base film has higher requirements on interface binding force, heat-resistant stability and coating uniformity of the coating and the base film because of adapting to special processes such as high-temperature gold stamping and the like. At present, the conventional release agent on the market mostly adopts common unmodified polysiloxane as a main raw material, and in the practical application process, the release agent has insufficient bonding strength with a polyester base film, and the problems of coating falling off, decomposition and the like easily occur under a high-temperature working condition, so that incomplete gold stamping pattern transfer is directly caused, and the yield of a terminal product is reduced. The existing release agent has a plurality of short plates in the formula design, most of the crosslinking agent and the adhesion promoter are compounded in a single component, a stable three-dimensional crosslinked network structure is difficult to form, and the mechanical strength and the wear resistance of the coating are poor. The proportion of the auxiliary agent is not reasonably regulated and controlled during the preparation of the partial parting agent, the synergistic effect of the leveling agent and the heat stabilizer is not fully exerted, defects such as coating pinholes, sagging and the like are easy to occur, and the performance fluctuation among product batches is large. The parameter setting of the traditional preparation process is not accurate enough, the pre-curing treatment link lacks a step of sectional temperature control, the instability of the release agent performance is further aggravated, and the large-scale application requirement of high-end gold stamping foil production cannot be met. Disclosure of Invention In order to solve the defects in the prior art, the invention discloses a release agent preparation method and a release agent which have stable performance and can meet the large-scale application requirements of high-end gold stamping foil production. The invention discloses a preparation method of a release agent, which comprises the following steps: weighing the raw materials, namely weighing main organic silicon resin, a cross-linking agent, a catalyst, an adhesion promoter, a leveling agent, a heat-resistant stabilizer and a mixed solvent according to weight percentage; Adding the main organic silicon resin and part of the mixed solvent into a reaction kettle, and stirring to obtain a premix; the construction of a modified crosslinking system, namely adding a crosslinking agent and an adhesion promoter into the premix, heating and stirring, and then adding a catalyst for continuous stirring to form a modified organosilicon prepolymer; compounding a functional auxiliary agent, namely adding a flatting agent and a heat resistant stabilizer into the modified organosilicon prepolymer, and performing ultrasonic dispersion; and (3) pre-curing treatment, namely carrying out sectional heating pretreatment on the obtained mixed system, then adding the rest mixed solvent to adjust the solid content, and filtering to obtain a release agent finished product. Further, the main organic silicon resin is modified polysiloxane containing vinyl and phenyl, the molecular weight is 5000-15000, the phenyl molar content is 10-30%, the viscosity at 25 ℃ is 500-2000 mPas, and the vinyl mass content is 0.5-2wt%. Further, based on the total weight of the raw materials, the weight percentages of the components are as follows: 40-58wt% of main organic silicon resin; 28-45wt% of mixed solvent; 2-8wt% of cross-linking agent; 1-6wt% of adhesion promoter; 0.5-3wt% of heat stabilizer; 0.1-3wt% of leveling agent; 0.1-2wt% of catalyst; And the sum of the contents of the components is 100wt%. Further, the cross-linking agent is at least one of hydrogen-containing silicone oil, tetraethoxysilane and methyltrimethoxysilane; when the cross-linking agent is hydrogen-containing silicone oil, the hydrogen content is 0.5-1.5wt% and the viscosity at 25 ℃ is 100-500 mPa.s. Further, the catalyst is a platinum catalyst or an organotin compound; The platinum catalyst has platinum content of 500-2000ppm and additive amount of 0.1-0.5wt% and the organic tin compound is at least one selected from dibutyl tin dilaurate and stannous octoate and has additive amount of 0.5-2wt%. Further, the adhesion promoter is a compound of an epoxy silane coupling agent and an amino silane coupling agent, and the mass ratio of the epoxy silane couplin