CN-122011461-A - Prepreg preparation method and matrix resin raw material composition

Abstract

The present invention provides a method for producing a prepreg, comprising an impregnating step in which a fiber base material is impregnated with a base resin raw material composition containing a base resin main agent, a curing agent, and a solvent, and a drying step in which the base resin raw material composition impregnated in the fiber base material in the impregnating step is dried. The main agent is epoxy resin. The curing agent is PEG lignin derivative. The solvent is a first solvent composed of glycol ethers and a second solvent composed of ethers.

Inventors

• Guan Manchun
• Soizawa Masaki

Assignees

• 本田技研工业株式会社

Dates

Publication Date

20260512

Application Date

20251103

Priority Date

20241108

Claims (9)

1. 1. A prepreg production method comprising an impregnating step in which a fiber base material is impregnated with a matrix resin raw material composition containing a matrix resin main agent, a curing agent and a solvent, and a drying step in which the matrix resin raw material composition impregnated in the fiber base material in the impregnating step is dried, characterized in that, The main agent is epoxy resin, and the main agent is epoxy resin, The curing agent is PEG lignin derivative, The solvent includes a first solvent composed of glycol ethers and a second solvent composed of ethers.
2. 2. A method for producing a prepreg according to claim 1, wherein, The boiling point of the first solvent is 120 ℃ or more and 140 ℃ or less, The boiling point of the second solvent is 25 ℃ or more and 110 ℃ or less.
3. 3. The method for producing a prepreg according to claim 1 or 2, further comprising a mixing step, In the mixing step, the base resin raw material composition is obtained by mixing the base agent, the curing agent, and the solvent, The mixing process comprises the following steps: a first mixing step of mixing the curing agent and the first solvent, and And a second mixing step of mixing the mixed composition of the curing agent and the first solvent with the second solvent.
4. 4. A method for producing a prepreg according to claim 1 or 2, wherein, The main agent is at least one of epoxidized soybean oil and sorbitol glycidyl ether.
5. 5. A method for producing a prepreg according to claim 1 or 2, wherein, The first solvent is ethylene glycol monomethyl ether, The second solvent is tetrahydrofuran.
6. 6. A method for producing a prepreg according to claim 1 or 2, wherein, The PEG lignin derivative has a phenol group derived from lignin and a hydroxyl group derived from PEG, and is in a powder form at normal temperature.
7. 7. A method for producing a prepreg according to claim 1 or 2, wherein, The temperature conditions of the drying step are set according to the boiling point of the solvent.
8. 8. A method for producing a prepreg according to claim 1 or 2, wherein, The boiling point of the solvent is lower than the curing temperature at which the curing reaction of the epoxy resin and the PEG lignin derivative begins.
9. 9. A matrix resin raw material composition comprises a main agent, a curing agent and a solvent, and is characterized in that, The main agent is epoxy resin, and the main agent is epoxy resin, The curing agent is PEG lignin derivative, The solvent includes a first solvent composed of glycol ethers and a second solvent composed of ethers.

Description

Prepreg preparation method and matrix resin raw material composition Technical Field The present invention relates to a prepreg preparation method and a matrix resin raw material composition for preparing a prepreg obtained by impregnating a fiber base material with a matrix resin containing an epoxy resin as a main agent and a polyethylene glycol (PEG) lignin derivative extracted from fir as a curing agent. Background Conventionally, a method for producing a resin composition containing an epoxy resin and a PEG lignin derivative has been known. For example, in the production method of patent document 1, a modified lignin obtained by chemical modification with polyethylene glycol is treated in a methanol solvent to be liquefied, and after mixing with an epoxy resin, the obtained solid is dried to remove methanol. However, the matrix resin of the prepreg is required to be capable of maintaining a uniform varnish state in order to sufficiently impregnate the fiber base material. However, as in the production method described in patent document 1, in the case of using methanol as a solvent, it is difficult to sufficiently dissolve lignin, and it is difficult to maintain a uniform varnish state in the impregnation step into the fiber base material. Prior art literature Patent literature Patent document 1, JP2020-203968A. Disclosure of Invention The prepreg production method according to one embodiment of the present invention includes an impregnating step in which a fiber base material is impregnated with a matrix resin raw material composition containing a matrix resin main agent, a curing agent, and a solvent, and a drying step in which the matrix resin raw material composition impregnated in the fiber base material in the impregnating step is dried. The main agent is epoxy resin. The curing agent is PEG lignin derivative. The solvent includes a first solvent composed of glycol ethers and a second solvent composed of ethers. The matrix resin raw material composition according to another embodiment of the present invention comprises a main agent, a curing agent, and a solvent. The main agent is epoxy resin. The curing agent is PEG lignin derivative. The solvent includes a first solvent composed of glycol ethers and a second solvent composed of ethers. Drawings The objects, features and advantages of the present invention are further elucidated by the following description of embodiments in connection with the accompanying drawings. Fig. 1 is a flowchart showing an example of a prepreg preparation method according to an embodiment of the present invention. Detailed Description An embodiment of the present invention will be described below with reference to fig. 1. The prepreg according to the embodiment of the present invention is an intermediate material of a fiber-reinforced resin, and is a sheet-like material in which a fiber base material such as glass fiber is impregnated with a matrix resin. The fiber reinforced resin can be prepared by laminating and press molding prepregs. The laminated prepregs are bonded to each other by a matrix resin having a viscous property. The prepreg thus laminated is press-molded under a temperature condition equal to or higher than the curing temperature of the matrix resin, whereby the matrix resin is cured and the fiber-reinforced resin is completed. Epoxy resins are exemplified as representative of thermosetting resins used as matrix resins. As curing agent for epoxy resins, PEG lignin derivatives of biological origin can be used. However, the PEG lignin derivative is a powder at normal temperature and is difficult to dissolve. Therefore, in the present embodiment, the matrix resin raw material composition is configured such that the PEG lignin derivative is dissolved by using an appropriate solvent, and mixed with the epoxy resin, so that the fiber base material is suitably impregnated with the composition. Fig. 1 is a flowchart showing an example of a prepreg preparation method according to an embodiment of the present invention. As shown in fig. 1, in the prepreg production method according to the embodiment of the present invention, first, 75 parts (for example, 585 g) of a powdery PEG lignin derivative is measured as a curing agent in step S1. SD4 produced by lignin materials company (LignoMateria company) as follows can be used as a PEG lignin derivative, for example. Next, in the first mixing step S2, 50 parts (e.g., 390 g) of liquid ethylene glycol monomethyl ether was measured as the first solvent, and the PEG lignin derivative in powder form measured in the step S1 was injected and stirred for 2 minutes using a stirrer. The PEG lignin derivative has a phenol group derived from lignin and a hydroxyl group derived from PEG. By selecting a substance having high compatibility with a phenol group as a solvent and allowing the solvent to act on the phenol group, the PEG lignin derivative can be sufficiently dissolved, and a varnish in a uniform mixed state can be obtai