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CN-122011688-A - Preparation method of high-toughness bi-component epoxy resin

CN122011688ACN 122011688 ACN122011688 ACN 122011688ACN-122011688-A

Abstract

The invention discloses a preparation method of high-toughness bi-component epoxy resin, which comprises the steps of mixing raw materials of an epoxy resin A component and a curing agent B component according to a proportion, stirring at a high speed until the raw materials are uniformly dispersed, subpackaging to obtain the component A, mixing raw materials of the curing agent B component according to a proportion, stirring until the raw materials are uniformly mixed, subpackaging to obtain the component B, and mixing and stirring the component A and the component B according to a mass ratio of 100:10-30 until the raw materials are uniformly mixed, so that the high-toughness bi-component epoxy resin is obtained. The bi-component epoxy resin system has reasonable formula design, takes bisphenol A epoxy resin as a matrix, matches cardanol glycidyl ether and rubber powder as core toughening components, simultaneously introduces hydrophobic white carbon black and a silane coupling agent for synergistic modification, realizes remarkable improvement of toughness on the premise of ensuring the mechanical strength of an epoxy resin cured product, and solves the technical problem of hard and brittle of the traditional epoxy resin.

Inventors

  • LIU LIGUO
  • Du Houwu
  • LIN DINGDUO

Assignees

  • 上海平谦科技有限公司

Dates

Publication Date
20260512
Application Date
20260317

Claims (10)

  1. 1. A preparation method of the high-toughness bi-component epoxy resin comprises the steps of mixing raw materials of the epoxy resin A in proportion, stirring at a high speed until the raw materials are uniformly dispersed, subpackaging to obtain the component A, mixing the raw materials of the curing agent B in proportion, stirring until the raw materials are uniformly mixed, subpackaging to obtain the component B, and mixing the component A and the component B in a mass ratio of 100:10-30 until the raw materials are uniformly mixed, wherein the component A comprises 50% -70% of bisphenol A epoxy resin, 10% -20% of cardanol glycidyl ether, 10% -30% of rubber powder, 0% -5% of hydrophobic white carbon black and 0% -5% of silane coupling agent.
  2. 2. The preparation method of the high-toughness bi-component epoxy resin is characterized in that in the component A of the epoxy resin, the weight percentage of the hydrophobic white carbon black is 1% -5%, and the weight percentage of the silane coupling agent is 1% -5%.
  3. 3. The preparation method of the high-toughness bi-component epoxy resin is characterized in that the rubber powder is one or a mixture of more than one of 40 meshes, 40-80 meshes and 80-200 meshes, and the rubber powder is one or more of nitrile rubber, styrene butadiene rubber and butadiene rubber.
  4. 4. The preparation method of the high-toughness bi-component epoxy resin according to claim 1, wherein the silane coupling agent is one or more of gamma-aminopropyl triethoxysilane, gamma-glycidol ether oxypropyl trimethoxysilane and gamma-methacryloxypropyl trimethoxysilane.
  5. 5. The method for preparing high-toughness bi-component epoxy resin according to claim 1, wherein the polyetheramine is one or more of D-230, D-400, D-2000, T-403 and T-5000.
  6. 6. The preparation method of the high-toughness bi-component epoxy resin is characterized in that in the first step, the rotating speed of high-speed stirring is 1000-3000 r/min, the stirring temperature is 25-40 ℃, the stirring time is 20-60 min, vacuum defoaming is adopted in the stirring process, the vacuum degree is-0.08 to-0.1 MPa, and the defoaming time is 10-30 min.
  7. 7. The method for preparing the high-toughness bi-component epoxy resin according to claim 1, wherein in the second step, the stirring speed is 300-800 r/min, the stirring temperature is 25-30 ℃, and the stirring time is 10-30 min.
  8. 8. The preparation method of the high-toughness bi-component epoxy resin is characterized in that in the third step, the rotation speed of mixing and stirring is 500-1500 r/min, the stirring temperature is 25-35 ℃, the stirring time is 5-20 min, and the curing time is 24-72 h after the mixing and the curing at the room temperature of 20-30 ℃.
  9. 9. The preparation method of the high-toughness bi-component epoxy resin according to claim 1, wherein the bisphenol A epoxy resin is E-51 type bisphenol A epoxy resin, the epoxy value is 0.51eq/100g, and the epoxy value of the cardanol glycidyl ether is 0.20-0.25 eq/100g.
  10. 10. The method for preparing high-toughness bi-component epoxy resin according to claims 1-9, wherein the prepared bi-component epoxy resin has a mixed viscosity of 6000-16000 mpa at 25 DEG C S, the tensile strength of the cured product is more than or equal to 60MPa, the elongation at break is more than or equal to 6.5%, the impact strength is more than or equal to 58KJ/m < 2 >, and the bending strength is more than or equal to 100MPa.

Description

Preparation method of high-toughness bi-component epoxy resin Technical Field The invention relates to the technical field of epoxy resin preparation, in particular to a preparation method of high-toughness bi-component epoxy resin. Background The epoxy resin is an organic polymer oligomer with two or more epoxy groups in a molecular structure, takes aliphatic, alicyclic or aromatic groups as a framework, and can form a thermosetting cured product through ring-opening reaction of the epoxy groups, and the epoxy resin has the characteristics of high bonding strength, good chemical stability, simple molding process, excellent compatibility with various base materials and the like, and is widely applied to various fields of aerospace, electronic appliances, building materials, automobile manufacturing, composite materials and the like. The traditional epoxy resin cured product has the defects of high crosslinking density of molecular structure, hard and brittle inherent defects caused by poor flexibility of molecular chain segments, low impact resistance and low elongation at break, and is easy to generate brittle fracture when being subjected to external force, so that the application of the epoxy resin cured product in application scenes with high requirements on the toughness of materials is greatly limited. In order to improve the toughness of epoxy resin, three modes are mainly adopted in the prior art, namely, a toughening agent such as rubber toughening agent and thermoplastic resin toughening agent is added in an epoxy resin system, but the toughening mode has the problem that the toughening agent is poor in compatibility with an epoxy resin matrix, phase separation is easy to occur, the mechanical strength, the adhesive property and the like of materials are synchronously reduced, the epoxy resin is chemically modified, the modified epoxy resin is prepared by introducing a flexible chain segment, the synthesis process is complex, the reaction condition is harsh, the storage stability of the modified epoxy resin is easy to be influenced, the production cost is greatly improved, and the curing agent is modified to develop the flexible curing agent. Meanwhile, the traditional toughening epoxy resin system has various other problems such as poor dispersibility of the system and influence on uniformity of material performance due to easiness in sedimentation of added inorganic filler, excessively high mixing viscosity of a part of toughening system, difficulty in molding construction, difficulty in controlling heat release amount of a curing reaction, easiness in influencing product quality due to local overheating during large-volume pouring, poor effect of combining mechanical strength and toughness, and remarkable reduction of mechanical properties such as tensile strength, bending strength and the like while improving toughness. Aiming at the technical problems, there is a need to develop an epoxy resin system which has simple preparation process, can be cured at room temperature, has moderate mixing viscosity and can obviously improve toughness on the premise of ensuring mechanical strength, solves the defect that the traditional epoxy resin cured product is hard and brittle, and simultaneously meets various requirements in industrial production and practical application. Disclosure of Invention The invention aims to overcome the defects of poor toughness, difficult compatibility of mechanical properties and toughness, severe curing conditions, easy sedimentation of a system and the like of an epoxy resin cured product in the prior art, and provides a preparation method of high-toughness bi-component epoxy resin. The bi-component epoxy resin prepared by the method consists of A, B components, has the advantages of simple preparation process, room temperature curing, low heat release amount of curing reaction and good system stability, and the prepared epoxy resin cured product has excellent mechanical strength and high toughness, has good adhesion, sedimentation resistance and construction fluidity, and can meet the requirements of different application scenes. The preparation method comprises the following steps of mixing raw materials of the epoxy resin A in proportion, stirring the raw materials of the curing agent B in proportion until the raw materials are uniformly dispersed, subpackaging the epoxy resin A in proportion, stirring the raw materials of the curing agent B in proportion until the raw materials are uniformly mixed, subpackaging the epoxy resin B in proportion, and mixing the epoxy resin A and the epoxy resin B in proportion until the raw materials are uniformly mixed, subpackaging the epoxy resin B in proportion, wherein the epoxy resin A comprises, by weight, 50% -70% of bisphenol A epoxy resin, 10% -20% of cardanol glycidyl ether, 10% -30% of rubber powder, 0% -5% of hydrophobic white carbon black and 0% -5% of silane coupling agent, the curing agent B comprises, by weight, 40% -60