A kind of surface modified castor fiber and its preparation method and application

A technology of surface modification and castor, which is applied in fiber treatment, plant fiber, textiles and papermaking, etc., can solve the problems of weak adhesion, poor interface bonding between castor fiber and resin matrix, etc., and achieve outstanding toughness and enhancement The effect of strong interface binding ability, adhesion and chelating force

Inactive Publication Date: 2018-01-26
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the first purpose of the present invention is to provide a kind of surface-modified castor-oil fiber for the problems such as castor-oil fiber and resin matrix interface binding situation poor, adhesion force that exists in the prior art; The purpose is to provide the preparation method of the surface modified castor fiber; the third purpose of the present invention is to provide the application of the surface modified castor fiber for strengthening and toughening epoxy resin

Method used

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  • A kind of surface modified castor fiber and its preparation method and application
  • A kind of surface modified castor fiber and its preparation method and application
  • A kind of surface modified castor fiber and its preparation method and application

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preparation example Construction

[0029] The preparation method of this surface-modified castor-oil fiber comprises the following steps: first castor-oil fiber is carried out silanization treatment; Then by polycondensation reaction graft terminal hydroxyl hyperbranched polymer on castor-oil fiber surface, its molecular structural formula is as follows figure 1 , and finally end-capping with an epoxy-based capping agent to obtain a surface-modified castor fiber, the molecular structure of which is as follows figure 2 .

[0030] The castor fiber with a length of 30-80 μm is selected as a raw material, and the surface-modified castor fiber obtained after modification has a constant length and a diameter of 10-15 μm.

Embodiment 1

[0032] (1) Preparation of surface modified castor fiber

[0033] Take 1g of castor fiber and add it to 17.4g of toluene, heat up to 80°C, then add dropwise 0.5g of 3-aminopropyltriethoxysilane, react for 6h, filter and dry to obtain silanized castor fiber. Weigh 1g of silanized castor fiber and add it to 9.45g of N,N-dimethylformamide, add 2.0g of succinic anhydride and 2.8g of pentaerythritol, heat up to 120°C, polymerize for 4 hours, and then add 15.0g of epichlorohydrin , The polymer was reacted at 110°C for 4 hours, and the surface-modified castor fiber was obtained after washing and drying.

[0034] image 3 Scanning electron micrographs of the prepared surface-modified castor fibers. Depend on image 3 It can be clearly seen that the epoxy-terminated hyperbranched polymer is grafted on the surface of the castor fiber, and the diameter of the surface-modified castor fiber is 10-15 μm.

[0035] (2) Reinforced and toughened bisphenol A diglycidyl ether epoxy resin with ...

Embodiment 2

[0038] (1) Preparation of surface modified castor fiber

[0039]Take 1g of castor fiber and add it to 17.4g of toluene, heat up to 80°C, then add 1.0g of 3-aminopropyltriethoxysilane dropwise, react for 6h, filter and dry to obtain silanized castor fiber. Weigh 1g of silanized castor fiber and add it to 9.45g of N,N-dimethylformamide, add 2.0g of succinic anhydride and 2.8g of pentaerythritol, heat up to 120°C, polymerize for 6 hours, and then add 20.0g of epichlorohydrin , The polymer was reacted at 110°C for 6 hours, and the surface-modified castor fiber was obtained after washing and drying.

[0040] (2) Reinforced and toughened bisphenol A diglycidyl ether epoxy resin with surface modified castor fiber

[0041] Take 6g of the above-mentioned modified castor fiber, add 100g of bisphenol A diglycidyl ether epoxy resin E51 and 35g of diethyltoluenediamine into the mixed system, and stir evenly. The curing conditions are 120°C / 2h+140°C / 2h+160°C / 2h. Measure its tensile stren...

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Abstract

The invention discloses a surface-modified castor fiber and its preparation method and application. The surface-modified castor is a castor fiber with a surface-grafted epoxy hyperbranched polymer, and the epoxy-terminated hyperbranched polymer The product is obtained by capping a hydroxyl-terminated hyperbranched polymer with an epoxy-capping agent. The preparation method of this surface modified castor fiber comprises the steps of: (1) carrying out silanization treatment to castor fiber; (2) grafting terminal hydroxyl hyperbranched polymer on the surface of castor fiber by polycondensation reaction, and then adopting epoxy The surface-modified castor-oil fiber is obtained by capping with a base capping agent. The application of the surface modified castor fiber is to use it as a bisphenol A type epoxy resin toughening reinforcing agent. The surface-modified castor fiber of the present invention has excellent interfacial binding ability and adhesive force with epoxy resin matrix, and it is used as the toughening reinforcing agent of bisphenol A epoxy resin, can improve resin toughness simultaneously, greatly improve Its tensile strength, tensile modulus, flexural strength and flexural modulus.

Description

technical field [0001] The invention relates to the modification and application of castor fiber, in particular to a surface-modified castor fiber, a preparation method and application of the surface-modified castor fiber. Background technique [0002] As one of the most important thermosetting resins, epoxy resin is widely used due to its advantages of convenient curing, easy molding and processing, strong bonding performance, good mechanical properties, electrical properties and chemical stability, excellent dimensional stability and low price. Used in adhesives, coatings, mechanical and electronic materials, plastic molds, composite materials, and structural materials. Most epoxy resins are liquid at room temperature. At room temperature or under heating, the epoxy resin reacts with the curing agent and cross-links to form an insoluble and infusible three-dimensional network structure polymer, showing excellent performance. However, epoxy resin has the disadvantages of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/507D06M13/513C08J5/06C08L63/00C08L97/02D06M101/04
CPCC08J5/06C08J2363/00C08J2497/02C08L63/00C08L2201/08C08L2205/16D06M13/513D06M15/507D06M2101/04C08L97/02
Inventor 黎水平诸华军吴其胜崔崇李延波王成双侯海军王占红张长森徐风广刘学然
Owner YANCHENG INST OF TECH
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