Preparation method of sisal fiber surface sizing agent and sisal fiber composite material

A technology of sisal fiber and sizing agent, which is applied in the field of material surface modification and composite material processing and molding, can solve the problems of poor bonding performance, long production cycle of finished products, and inability to continue production, so as to improve bonding strength, Improve compatibility and reduce the effect of damage

Inactive Publication Date: 2013-12-25
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned prior art, in order to overcome the disadvantages of poor bonding performance between sisal fiber and matrix, long production cycle of finished products, and inability to produce continuously, the present invention provides a sizing agent for the surface of sisal fiber. Properties An emulsion-type sizing agent suitable for sisal fiber with good compatibility has been prepared. The sizing agent does not contain organic solvents, which can effectively avoid the pollution of the environment caused by organic solvents. It is environmentally friendly and clean, and the processing process is simple; the present invention aims at The high-strength sisal fiber composite material is obtained, and the aspect ratio of the fiber is retained to the greatest extent. Therefore, a one-step injection molding process is adopted on the basis of the sisal fiber sizing treatment, which reduces the damage to the sisal fiber and is beneficial to the strength. improvement

Method used

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  • Preparation method of sisal fiber surface sizing agent and sisal fiber composite material
  • Preparation method of sisal fiber surface sizing agent and sisal fiber composite material
  • Preparation method of sisal fiber surface sizing agent and sisal fiber composite material

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preparation example Construction

[0020] A kind of preparation method of sisal fiber composite material of the present invention is as figure 1 As shown, the main process is: after the sisal fiber raw material is dried and cut short - acetone treatment - alkali treatment - fiber surface sizing treatment - encapsulation for standby or mechanical mixing with thermoplastic resin, one-step injection molding injection molding, specific steps as follows:

[0021] Step 1. Surface pretreatment of sisal fibers: drying the sisal fibers at 50-80°C; cutting the dried sisal fibers into short fibers with a length of 4-5 mm, immersing them in acetone and boiling for 30-50 minutes , cleaned with deionized water, dried again, immersed in a 10% sodium hydroxide solution by weight, soaked for 4 hours, filtered to obtain fibers, rinsed with deionized water until neutral, and dried;

[0022] Step 2, sizing the sisal fiber after surface pretreatment: immersing the sisal fiber treated in step 1 in the sisal fiber surface sizing age...

Embodiment 1

[0026] In Example 1, sisal fiber polylactic acid composite material, the raw material used is sisal fiber, the sizing agent for surface treatment of sisal fiber and the thermoplastic resin and treatment agent in the process of preparing the composite material include acetone (AR), hydroxide Sodium (AR), isocyanate-modified bisphenol F type epoxy resin aqueous emulsion (nonionic surfactant), γ-(2,3-glycidoxy)propyltrimethoxysilane coupling agent, polylactic acid. Using one-step injection molding method, the specific steps are as follows:

[0027] Step 1. Pretreatment of the sisal fiber surface: put the sisal fiber in an oven at 50°C and dry for 3 hours; cut the dried sisal fiber into short fibers with a length of 4-5 mm, and immerse in acetone (Acetone should not pass through the fiber), boil for 30min, take out the sisal fiber and clean it with deionized water, dry it at 50°C for 3h, then immerse the sisal fiber in a sodium hydroxide solution with a concentration of 10wt%, soa...

Embodiment 2

[0033] In Example 2, sisal fiber polylactic acid composite material, the raw material includes sisal fiber, the treatment agent includes acetone (AR) and sodium hydroxide (AR), and the composition and weight percentage of the sizing agent are: isocyanate modified bisphenol A Mixed aqueous emulsion of type epoxy resin and epoxy-terminated polyurethane resin (the weight ratio between the two is 2:1), bis(dioctyloxypyrophosphate) ethylene titanate coupling agent, γ -(2,3-Glycidoxy)propyltrimethoxysilane coupling agent, the thermoplastic resin is polylactic acid. Among them, the concentration of sizing agent is 60wt%, the concentration of bis(dioctyloxypyrophosphate) ethylene titanate coupling agent is 2wt%, and γ-(2,3-glycidyloxy)propyltrimethoxysilane The coupling agent concentration is 4wt%, the polyether-modified polysiloxane copolymer is 1wt%, the fatty acid sorbitan is 5wt%, and the rest is water. The preparation steps of the sisal fiber polylactic acid composite material i...

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Abstract

The invention discloses a preparation method of a sisal fiber surface sizing agent and a sisal fiber composite material. The sisal fiber surface sizing agent is water-based emulsion prepared from a modified resin film forming agent (1-60wt%), a coupling agent (0.5-8wt%), a levelling agent (0-1wt%), a wetting agent (0-8wt%), a surface active agent (0.5-8wt%), water and the like according to a phase inversion emulsification method, sisal fibers are treated by the sizing agent and then are mixed with a certain amount of resin, and one-step injection moulding is carried out by adopting an injection moulding machine, so that the sisal fiber composite material is obtained. The sisal fiber surface sizing agent well improves compatibility of the sisal fibers and matrix resin, and tensile strength of the sisal fiber composite material is effectively increased. The preparation method of the sisal fiber composite material is simple, cost is saved, fiber content is easy to control, the problem that compatibility of the sisal fibers and matrix is poor can be well solved, and the preparation method of the sisal fiber composite material can be applied to industrialization production.

Description

technical field [0001] The invention relates to a material surface modification treatment and a processing and forming method of a composite material, in particular to a sisal fiber sizing agent and a preparation method of a sisal fiber composite material. Background technique [0002] Sisal fiber has a wide range of sources, has high tensile strength, and is environmentally friendly. In recent years, due to the oil crisis, it has become more popular. However, there are many impurities on the surface of sisal fiber, and the bonding performance with resin is poor, so its surface treatment is fast and effective. The preparation process of composite materials has become a research hotspot. [0003] The research on sizing agents abroad has been relatively mature, and there is a certain gap in domestic development. Most of the existing public information focuses on carbon fiber sizing agents. For example, the invention patent of Naoki Sugiura et al. "Sizing agent for carbon fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55D06M15/564C08L97/02C08L67/04C08L77/02C08L23/12C08L23/06D06M101/04
Inventor 万怡灶张传印罗红林
Owner TIANJIN UNIV
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