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CN-121991326-A - Processing technology of flame-retardant color-changing unsaturated polyester resin

CN121991326ACN 121991326 ACN121991326 ACN 121991326ACN-121991326-A

Abstract

The invention relates to the technical field of polyester resin materials, and discloses a processing technology of flame-retardant color-changing unsaturated polyester resin, which comprises the following steps: the method comprises the steps of preparing an unsaturated polyester resin base material, blending powder materials, blending flame-retardant aluminum hydroxide powder, fumed silica, photochromic glass micropowder and a release agent, mixing, blending the unsaturated polyester resin base material prepared in the step with the powder materials prepared in the step, stirring, adding chopped glass fibers, and changing the stirring direction. The unsaturated polyester resin has good thixotropic and curing effects, simultaneously has excellent mechanical properties, weather resistance, water resistance and corrosion resistance, can solve the problem of illumination in a building, changes along with illumination change, can better meet the illumination requirement in the building, has better flame retardance, and remarkably improves the safety of the building.

Inventors

  • FAN HAIBO
  • CHE LI
  • TANG XIAOLEI
  • LI CHUJIANG

Assignees

  • 新疆亿贝森新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260122

Claims (8)

  1. 1. The processing technology of the flame-retardant color-changing unsaturated polyester resin is characterized by comprising the following steps of: in a first step, an unsaturated polyester resin base material is prepared, comprising the steps of: Step S1, adding dihydric alcohol, saturated dibasic acid or anhydride and unsaturated dibasic acid or anhydride into a reaction kettle, and heating to 190-220 ℃ for polycondensation and dehydration reaction to obtain resin A; Step S2, adding styrene and an acrylic ester or methacrylic ester crosslinking monomer into the resin A, and uniformly mixing; Secondly, powder blending: Blending flame-retardant aluminum hydroxide powder, fumed silica, photochromic glass micropowder and a release agent, wherein the addition of the flame-retardant aluminum hydroxide powder is 1.5-2.0% of the total mass of the resin A, the addition of the fumed silica is 0.5-2.0% of the total mass of the resin A, the particle size of the photochromic glass micropowder is 80-100 meshes, and the addition of the photochromic glass micropowder is 10-15% of the total mass of the resin A; Thirdly, mixing: Blending the unsaturated polyester resin base material prepared in the first step with the powder material prepared in the first step, stirring for 20-25min at the rotating speed of 800-1000r/min, adding the chopped glass fibers while stirring, changing the stirring direction, and continuously stirring for 20-25min at the rotating speed of 800-1000 r/min.
  2. 2. The process for preparing flame-retardant color-changing unsaturated polyester resin according to claim 1, wherein in the second step, the release agent is zinc stearate, and the addition amount of the release agent is 0.5-1.5% of the total mass of the resin A.
  3. 3. The process for preparing flame-retardant color-changing unsaturated polyester resin according to claim 1 or 2, wherein in the step S2, the sum of the addition of styrene and the addition of acrylate or methacrylate crosslinking monomers is 25-50% of the total mass of the resin A, and the addition of the acrylate or methacrylate crosslinking monomers is more than or equal to 5% of the total mass of the resin A.
  4. 4. A process for preparing a flame retardant color-changing unsaturated polyester resin according to claim 3, wherein in said step S2, said acrylic or methacrylic ester crosslinking monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, butyl acrylate, propylene diacrylate, pentaerythritol triacrylate, 1, 4-butylene diacrylate, hydroxyethyl methacrylate, methyl methacrylate, and ethylene dimethacrylate.
  5. 5. The processing technology of the flame-retardant color-changing unsaturated polyester resin is characterized in that in the step S1, the reaction is carried out until the acid value is less than or equal to 30mgKOH/g, in the step S2, the temperature is reduced to 130-180 ℃, and hydroquinone with the mass of 100-300 ppm of the total mass of the resin A is added.
  6. 6. The process for preparing flame retardant color-changing unsaturated polyester resin according to claim 5, wherein the dihydric alcohol is one or more of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol and neopentyl glycol.
  7. 7. The process for producing a flame retardant color-changing unsaturated polyester resin according to claim 5, wherein said saturated dibasic acid or anhydride is one or more of phthalic anhydride, isophthalic acid, terephthalic acid and tetrahydrophthalic anhydride.
  8. 8. The process for producing a flame retardant color-changing unsaturated polyester resin according to claim 5, wherein said unsaturated dibasic acid or anhydride is one or both of maleic anhydride and fumaric acid.

Description

Processing technology of flame-retardant color-changing unsaturated polyester resin Technical Field The invention relates to the technical field of polyester resin materials, in particular to a processing technology of flame-retardant color-changing unsaturated polyester resin. Background Unsaturated Polyester Resin (UPR) is the most common type in thermosetting resin, and is usually formed by polycondensation of saturated dibasic acid, unsaturated dibasic acid and polyhydric alcohol to form linear polymer, and the linear polymer can be cured and formed at room temperature after being diluted by a crosslinking monomer or an active solvent, and the cured resin has good comprehensive performance, high tensile, bending and compressive strength, strong chemical corrosion resistance and good dielectric property, and is particularly suitable for the production of glass fiber reinforced plastic products with large-scale and large-scale requirements. However, conventional unsaturated polyester resins themselves have flammability, and their limiting oxygen index is usually only 18-20%, and they release a lot of heat and smoke during combustion, which brings about serious fire safety hazards. The current popular outdoor travel "starry sky" has transparent dome made of common glass or organic glass material. Common glass has fragile safety risk, organic glass has large brittleness, is easy to crack and scratch, has general impact resistance, has potential fire risk in a relatively complex electricity or open flame environment in the field, does not have dimming or color changing functions, can rapidly raise indoor temperature under strong sunlight in the daytime, generates serious 'greenhouse effect', and leads to rapid increase of energy consumption (such as cooling by a high-power air conditioner) and reduction of user experience. The existing preparation technology of flame-retardant unsaturated polyester resin is to realize the fireproof function by flame-retardant modification on the basis of common unsaturated polyester resin, but in practical application, the flame-retardant unsaturated polyester resin material still has the problem of poor stability, so that the flame-retardant capability of the material can be obviously reduced in a long-term use or high-temperature environment, and the problem that the mechanical property and the curing capability of the material can be obviously reduced after flame-retardant components are added, meanwhile, the total amount of the added flame-retardant components is higher, although the flame-retardant efficiency is improved, the processing fluidity of the resin and the light transmittance of a final product are seriously deteriorated. The existing preparation technology of the color-changing unsaturated polyester resin mainly introduces thermochromic microcapsules, photochromic dyes and the like into an Unsaturated Polyester Resin (UPR) matrix in a physical blending mode, the thermal stability of the color-changing materials (especially microcapsules and organic dyes) is generally poor, and the curing process of the UPR usually involves a free radical polymerization exothermic reaction at a higher temperature, so that the deactivation or the color-changing performance attenuation of the color-changing materials is very easy to cause. Secondly, the interfacial compatibility of the color-changing material and the UPR matrix is a key difficulty, poor compatibility can lead to uneven dispersion and agglomeration of the color-changing material, so that the uniformity and sensitivity of the color-changing effect are affected, stress defect points can be formed at the interface, and the color-changing material becomes a short plate with mechanical properties of the material. Disclosure of Invention The invention aims to solve the technical problems of providing a processing technology of flame-retardant color-changing unsaturated polyester resin, which overcomes the defects of the prior art, and can effectively solve the problems that the existing flame-retardant unsaturated polyester resin material still has poor stability of flame retardance, poor mechanical property and poor curing capability and cannot give consideration to color changing performance, and the existing color-changing unsaturated polyester resin material cannot ensure the flame retardance and the mechanical property of the material while solving uniform and sensitive color changing. The invention adopts the technical scheme that the processing technology of the flame-retardant color-changing unsaturated polyester resin comprises the following steps: in a first step, an unsaturated polyester resin base material is prepared, comprising the steps of: Step S1, adding dihydric alcohol, saturated dibasic acid or anhydride and unsaturated dibasic acid or anhydride into a reaction kettle, and heating to 190-220 ℃ for polycondensation and dehydration reaction to obtain resin A; Step S2, adding styrene and an acrylic est