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CN-121991327-A - Unsaturated polyester resin for artificial stone and artificial stone thereof

CN121991327ACN 121991327 ACN121991327 ACN 121991327ACN-121991327-A

Abstract

The application discloses an unsaturated polyester resin for artificial stone and an artificial stone thereof, which are prepared from the following raw materials, by mass, 20-30 parts of dihydric alcohol containing neopentyl glycol and dimeric acid-based polyester dihydric alcohol, 28-35 parts of acid/anhydride mixture containing isophthalic acid, maleic anhydride, hexahydrophthalic anhydride and itaconic acid, and 30-35 parts of functional diluent containing styrene, methyl methacrylate and isobornyl acrylate, so that the low-viscosity, low-shrinkage and high-mechanical properties are realized, and the requirements of high-end artificial stone on production resin are met.

Inventors

  • CHEN SHUWEN
  • Xie Haizhi
  • LU SHIWEN

Assignees

  • 云浮晨宝新材料有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (8)

  1. 1. An unsaturated polyester resin for artificial stone is characterized by being prepared from the following raw materials in parts by mass: 20-30 parts of glycol comprising neopentyl glycol and dimer acid based polyester glycol; 28-35 parts of an acid/anhydride mixture comprising isophthalic acid, maleic anhydride, hexahydrophthalic anhydride and itaconic acid; 30-35 parts of functional diluent, which comprises styrene, methyl methacrylate and isobornyl acrylate.
  2. 2. An unsaturated polyester resin for artificial stone according to claim 1, further comprising a phosphate flame retardant in an amount of 2 to 6 parts.
  3. 3. An unsaturated polyester resin for artificial stone according to claim 2, wherein said phosphate flame retardant is pentaerythritol phosphate.
  4. 4. An unsaturated polyester resin for artificial stone according to claim 1, further comprising 3-7 parts of hyperbranched polyester.
  5. 5. An unsaturated polyester resin for artificial stone according to claim 4, characterized in that the hyperbranched polyester has a hydroxyl number of 280-320mg KOH/g.
  6. 6. An unsaturated polyester resin for artificial stone according to claim 1, further comprising 1-2 parts of a vinyl silane coupling agent.
  7. 7. An unsaturated polyester resin for artificial stone according to claim 2, characterized in that the vinylsilane coupling agent is vinyltris (2-methoxyethoxy) silane.
  8. 8. An unsaturated polyester resin for artificial stone, characterized in that the raw materials thereof comprise an inorganic filler and the unsaturated polyester resin for artificial stone according to any one of claims 1 to 7.

Description

Unsaturated polyester resin for artificial stone and artificial stone thereof Technical Field The application relates to artificial stone, in particular to unsaturated polyester resin for artificial stone and the artificial stone thereof. Background The core matrix material of the artificial marble (solid facer) is an unsaturated polyester resin, the properties of which directly determine the quality of the final product. When the current commercial general resin meets the manufacturing requirements of high-end artificial stone, the following technical contradictions are often faced: The high crosslinking density designed for improving the hardness and the heat resistance often leads to excessive viscosity of the resin, so that the manufacturability is poor when the resin is mixed with a large amount of inorganic filler, the problems of bubbles, uneven infiltration and the like are easily generated, and meanwhile, the high curing shrinkage rate can lead to deformation of the plate and influence the yield of large-size products. Therefore, development of a special polyester resin which can achieve excellent manufacturability, low shrinkage and high mechanical property is needed. Disclosure of Invention In order to meet the requirements of high-end artificial stone on performance stability and manufacturability, the unsaturated polyester resin for the artificial stone and the artificial stone thereof are provided. The first object of the present invention is achieved by the following technical solutions: the unsaturated polyester resin for the artificial stone is prepared from the following raw materials in parts by mass: 20-30 parts of glycol comprising neopentyl glycol and dimer acid based polyester glycol; 28-35 parts of an acid/anhydride mixture comprising isophthalic acid, maleic anhydride, hexahydrophthalic anhydride and itaconic acid; 30-35 parts of functional diluent, which comprises styrene, methyl methacrylate and isobornyl acrylate. By adopting the technical scheme, part of the dihydric alcohol is dimeric acid based polyester dihydric alcohol which can form a skeleton with hardness and softness together with neopentyl glycol, wherein the rigidity is provided for guaranteeing the hardness and the heat resistance, the original viscosity of the resin body is effectively reduced by a long flexible chain of the dimeric acid based polyester dihydric alcohol, and the inherent toughness of a cured network is endowed, so that good fluidity and wettability can be kept when the resin is mixed with a large amount of inorganic fillers from the source, the generation of bubbles is avoided, and meanwhile, the shock resistance of a product is guaranteed; the partial amount of the acid/anhydride mixture is hexahydrophthalic anhydride and itaconic acid; The carboxyl introduced by the itaconic acid reacts with glycol when the acid value is reduced in the later period of resin reaction synthesis to form a certain branched structure, a branching point is introduced in polycondensation or the polarity is increased, isobornyl acrylate in a functional diluent is polymerized near the branching point, and a large-volume rigid structure of the isobornyl acrylate forms steric hindrance after polymerization, so that the two can generate a rigid branching point effect in combination, and high hardness and low shrinkage can be realized under lower crosslinking density; In addition, the hexahydrophthalic anhydride has an alicyclic structure, the dimer acid-based polyester diol has a long fatty chain, and the combination of the hexahydrophthalic anhydride and the dimer acid-based polyester diol possibly forms a microphase separation structure of a flexible section and a rigid annular section in the molecular chain, so that the toughness and the modulus can be improved simultaneously, the hardness is improved without obviously increasing the viscosity, and the superposition effect is generated by the polymerization of the hexahydrophthalic anhydride and the large-volume rigid structure of the isobornyl acrylate, so that the shrinkage rate can be further reduced; realizes the compromise of low viscosity, low shrinkage and high mechanical property, and meets the requirement of high-end artificial stone on resin for production. Optionally, the flame retardant also comprises a phosphate flame retardant, wherein the dosage of the phosphate flame retardant is 2-6 parts. By adopting the technical scheme, on one hand, the flame retardant property of the resin can be enhanced, on the other hand, the phosphate flame retardant has polar phosphate groups, and has strong intermolecular interaction and synergistic interaction with carboxyl polar sites of itaconic acid, so that the polarity of the resin is enhanced, the infiltration and interfacial bonding with inorganic fillers (one of artificial stone raw materials) are improved, the air bubbles are reduced, and the compactness and mechanical property of the artificial stone are improved. Optio