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CN-122011338-A - Hyperbranched epoxy resin, preparation method thereof and application thereof in coating

CN122011338ACN 122011338 ACN122011338 ACN 122011338ACN-122011338-A

Abstract

The invention belongs to the technical field of paint, and discloses hyperbranched epoxy resin, a preparation method and application thereof in paint, wherein the resin has a highly branched topological structure, the viscosity of the resin at 25 ℃ is 200-2000 mPa.s, the epoxy value of the resin is 0.25-0.50eq/100g, the novel hyperbranched epoxy resin with low viscosity and high reactivity is provided, a coating system scheme of 'functional layering design' and 'interlayer reaction window construction' is innovatively provided, the inherent contradiction between high performance and environmental friendliness, high adhesive force and high flexibility, deep reinforcement and surface super wear resistance of the traditional epoxy paint is systematically solved, the resin can realize high solid content or even solvent-free coating, accords with the environmental protection trend, and the multi-layer composite coating constructed based on the adjustable characteristic of the resin realizes the comprehensive protection performance of a far super single coating through interlayer molecular level interpenetrating cross-linking, and particularly shows excellent adhesive force, impact resistance and durability on porous substrates such as concrete.

Inventors

  • MA LE
  • AN JIASHU
  • WANG QIANG
  • WANG QIUSI
  • HE YU

Assignees

  • 陕西龙源新能源有限公司

Dates

Publication Date
20260512
Application Date
20251229

Claims (10)

  1. 1. A hyperbranched epoxy resin is characterized in that the resin has a highly branched topological structure, the viscosity of the resin at 25 ℃ is 200-2000 mPa.s, and the epoxy value is 0.25-0.50eq/100g.
  2. 2. The hyperbranched epoxy resin according to claim 1, wherein the branched core of the resin is trimethylolpropane, pentaerythritol or dipentaerythritol.
  3. 3. The method for preparing the hyperbranched epoxy resin according to any one of claims 1 to 2, comprising the following steps: s1, heating a branched nuclear molecule and a catalyst to 60-80 ℃ in an inert atmosphere; s2, uniformly dripping epoxy chloropropane into the system of the S1, controlling the dripping time to be 1-3 hours, and keeping the reaction temperature; S3, after the dripping is finished, heating to 90-120 ℃ and continuing to react for 2-5 hours; s4, after the reaction is finished, the hyperbranched epoxy resin is obtained through post-treatment.
  4. 4. The method according to claim 3, wherein the catalyst is tetrabutylammonium bromide, tetraethylammonium bromide or triphenylphosphine in an amount of 0.5% to 2.0% by mass of the branched core molecule.
  5. 5. The method according to claim 1 to 4, wherein the hyperbranched epoxy resins of different viscosity and functionality types are used in each case for preparing different coatings of the multilayer coating with complementary properties.
  6. 6. The method according to claim 5, wherein the hyperbranched epoxy resins of different viscosity and functionality types are coated with specific interlayer construction sequences.
  7. 7. Use according to claim 5, characterized in that the multilayer coating comprises at least: a primer layer formulated from said hyperbranched epoxy resin of low viscosity type for penetrating a substrate; An intermediate layer for stress buffering formulated from the hyperbranched epoxy resin of flexible modified type; a surface coating for surface protection formulated from said hyperbranched epoxy resin of high functionality and high hardness type.
  8. 8. The method according to claim 6, wherein the specific interlayer construction time sequence is that when two adjacent layers are coated, the next layer is required to be coated within a specific time window after the previous layer is dried and before the previous layer is dried.
  9. 9. The use according to claim 7, characterized in that: After the primer coating, the intermediate layer is coated for a time window of 30 minutes to 4 hours; after the intermediate layer is coated, the coating time window of the surface coating is 1 to 6 hours.
  10. 10. The method according to claim 8, wherein the composite protective coating is formed on a concrete, metal or wood substrate with high adhesion, high flexibility and high wear resistance.

Description

Hyperbranched epoxy resin, preparation method thereof and application thereof in coating Technical Field The invention relates to the technical field of paint, in particular to hyperbranched epoxy resin, a preparation method thereof and application thereof in paint. Background Epoxy resins are widely used as key film forming materials for protective coatings, floor coatings and composite material matrixes due to their excellent adhesion, chemical stability and mechanical properties, and conventional bisphenol a type epoxy resins are of linear molecular structure, and in coating applications, are generally mixed with a curing agent and then form a continuous protective coating on the surface of a substrate through coating, curing and other processes. However, the structural characteristics of linear epoxy resins also present some inherent limitations: (1) The high melt viscosity of the linear epoxy resin often requires the addition of a large amount of volatile organic solvents or reactive diluents to achieve a workable coating viscosity, which is contrary to increasingly stringent environmental regulations; (2) The cured coating network has a regular structure, so that the coating network has large internal stress and high brittleness, and is easy to crack or peel when the deformation or impact of the base material is handled; (3) For porous or easily cracked base materials such as concrete and wood, the common epoxy paint is difficult to balance between deep penetration reinforcement and high-strength wear resistance of the surface, and a single coating cannot meet the comprehensive performance requirement under complex working conditions. In order to achieve low viscosity, high toughness and multi-functionality of the coating, some researches are performed in the industry, for example, the epoxy resin is modified by a soft segment or blended with other resins, but these methods usually have the cost of sacrificing the hardness, heat resistance or adhesion of the coating, and have complex process and limited performance improvement, so that a novel epoxy resin material is developed, and an innovative coating application scheme is designed based on the characteristics of the novel epoxy resin material to systematically solve the technical contradiction faced in the high-performance and environment-friendly coating field, which has become a key problem to be broken through in the art. Disclosure of Invention The invention aims to provide hyperbranched epoxy resin, a preparation method and application thereof in coating, so as to solve the problems in the background art, and provides a novel hyperbranched epoxy resin with low viscosity and high reactivity, and creatively provides a coating system scheme of 'functional layered design' and 'interlayer reaction window construction', so that the inherent contradiction between high performance and environmental friendliness, high adhesion and high flexibility, deep reinforcement and surface super wear resistance of the traditional epoxy coating is systematically solved, the resin can realize high solid content and even solvent-free coating, accords with environmental protection trend, and the multilayer composite coating constructed based on the adjustable characteristics of the resin realizes comprehensive protective performance of far-ultra single coating through interlayer molecular level interpenetrating crosslinking, and particularly shows excellent adhesion, impact resistance and durability on porous substrates such as concrete. In order to achieve the above purpose, the present invention provides the following technical solutions: A hyperbranched epoxy resin having a highly branched topology with a viscosity of 200-2000 mPa-s at 25 ℃ and an epoxy value of 0.25-0.50eq/100g. Preferably, the branched core of the resin is trimethylolpropane, pentaerythritol or dipentaerythritol. A preparation method of hyperbranched epoxy resin comprises the following steps: s1, heating a branched nuclear molecule and a catalyst to 60-80 ℃ in an inert atmosphere; s2, uniformly dripping epoxy chloropropane into the system of the S1, controlling the dripping time to be 1-3 hours, and keeping the reaction temperature; S3, after the dripping is finished, heating to 90-120 ℃ and continuing to react for 2-5 hours; s4, after the reaction is finished, the hyperbranched epoxy resin is obtained through post-treatment. Preferably, the catalyst is tetrabutylammonium bromide, tetraethylammonium bromide or triphenylphosphine, in an amount of 0.5% to 2.0% of the branched core molecular mass. The application of the hyperbranched epoxy resin in the coating is that the hyperbranched epoxy resins with different viscosity and functionality types are respectively used for preparing different coatings in the multi-layer coating with complementary performances. Preferably, hyperbranched epoxy resins with different viscosity and functionality types are respectively coated by adopting specific interlay