JP2002363862A - Fiber for forming material, fiber-reinforced forming material and formed article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber for a forming material disposable by incineration without emitting foul odor and having excellent reinforcing effect for an organic reinforcing fiber and provide a forming material reinforced with an organic fiber and giving a formed article having excellent strength and elastic modulus. SOLUTION: The fiber for a forming material is an organic fiber covered at least a part of the surface with a coating film of a component extracted from a natural fiber. The component extracted from a natural fiber is sericin or keratin. The organic fiber is preferably a cellulosic fiber such as hemp, jute, kanaf and Manila fiber. The invention further provides a fiber-reinforced forming material containing (A) the fiber for a forming material and (B) a thermoplastic fiber and/or (C) a resin and a formed article produced by the thermal forming of the fiber-reinforced forming material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic molding material fiber and a fiber-reinforced molding material using the molding material fiber, and more particularly to a molding material fiber, a matrix fiber and a matrix resin. The present invention relates to a fiber-reinforced molding material having good adhesion to a (matrix) and capable of improving the strength of a molded article.

[0002]

2. Description of the Related Art As means for reinforcing a resin molded article, means for improving the strength and elastic modulus by dispersing reinforcing fibers is widely used in applications such as composites. In particular, in applications requiring lightness and deep drawability, such as ceiling materials for automobiles, a method of thermoforming a fiber aggregate in which thermoplastic fibers and reinforcing fibers serving as a matrix are mixed is widely used. ing. Although there are various types of fibers used for reinforcement, inexpensive glass fibers having high strength, elastic modulus or thermal stability and being inexpensive are generally used.
However, glass fibers may be scattered in the air when forming a fiber aggregate by a generally used card method or the like, causing inflammation on the skin of workers involved in the production, and the generation of broken fibers. The terminal ends into the lung, suggesting a possible carcinogen. Also, after use,
There are drawbacks such as difficulty in recycling and incineration. As a means for solving such a problem, the use of bast fibers such as hemp, kenaf or jute having an elastic modulus close to that of glass fibers instead of glass fibers has been studied. The problem is the generation of an odor presumed to be caused by the decomposition of pectin contained in pectin. In addition, there is a problem that the reinforcing effect of the reinforcing fibers is not sufficiently exhibited due to poor adhesion between the organic fiber-based reinforcing fibers and the resin having a relatively low melting point as a matrix.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a fiber for molding material which has no problem of generation of odor, which can be incinerated, and which is an organic fiber-based reinforcing fiber and which has an excellent reinforcing effect. Another object of the present invention is to economically provide a fiber-reinforced molding material capable of molding a molded article having excellent strength and elastic modulus.

[0004]

The present invention provides: (1) a fiber for a molding material, wherein at least a part of the surface of the organic fiber is coated with a component extracted from a natural fiber; Wherein the component extracted from the natural fiber is sericin or keratin; (3) the molding material fiber according to the above (1), wherein the organic fiber is a cellulosic fiber such as hemp, jute, kenaf or manila hemp. The fiber for molding material according to any one of the above (1) to (3), wherein (4) A fiber-reinforced molding material comprising the molding material fiber (A) according to any one of (1) to (3) and a thermoplastic fiber (B) and / or a resin (C). . (5) The thermoplastic fiber (B) and / or resin (C)
Characterized in that at least one of them is polypropylene. (6) A fiber-reinforced molding material, wherein at least a part of the polypropylene is maleic modified. (7) A fiber-reinforced molding material obtained by thermoforming the fiber-reinforced molding material according to (4) to (6).

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The organic fibers used in the present invention include natural fibers such as synthetic fibers such as polyester and polyamide, regenerated cellulose fibers such as rayon and polynosic, and bast fibers such as hemp, jute, kenaf and manila hemp. Fibers and the like are preferable because regenerated cellulose fibers and natural cellulosic fibers have almost the same elastic modulus as glass and have small temperature dependence. In particular, in the case of a natural cellulosic fiber, it is preferably used as an interior / exterior material for automobiles, even if it is heated to a temperature of 80 ° C. or more under hot summer sun without a fear of a decrease in strength or elastic modulus.

[0006] It is preferable that sericin and keratin are contained as components extracted from natural fibers in the present invention. These components are preferably extracted from silk, wool, or the like, but may be those extracted from various natural products. In addition, silk sericin is contained in the refining waste liquid, but its treatment is a problem. Therefore, the present invention can be effectively used and is suitable for the purpose of achieving zero emission. In the present invention, the components extracted from these natural fibers form a relatively strong coating on the surface of organic fibers serving as a reinforcing material, particularly hydrophilic organic fibers such as cellulosic fibers. The effect of improving is exhibited. In addition, it has been clarified in the course of the study by the inventors that the adhesiveness with the resin matrix can be improved.

In the present invention, the resin used as the matrix (base material) includes polypropylene (PP),
Fibers or powders made of thermoplastic resins such as polyolefins such as polyethylene, polyamides, polyesters, and polyphenylene sulfides, powders, and granular materials are available, but there is no problem with thermosetting resins such as epoxy resins and phenolic resins. From the viewpoint of lightness, PP resin is preferred.

Further, from the viewpoint of improving the adhesion to the hydrophilic organic fiber, it is preferable to use a partly mixed maleic acid-modified PP resin or to use the entirety. Matrix components having high hydrophilicity have good adhesiveness to extracts from natural fibers, and can greatly improve overall adhesiveness.

The method for obtaining the natural fiber extract component is not limited, but any of aprotic polar solutions such as isopropyl alcohol, dimethylsulfoxide (DMSO) and dimethylformamide (DMF) and hot water can be obtained from silk or wool. It is preferable to use and extract. Above all, D
MSO is particularly preferable because it has low toxicity and a high boiling point, so that the problem of outflow to the atmosphere hardly occurs.

When the natural fiber is silk, especially DMSO
The solution is particularly preferred because it has a small problem of molecular weight reduction due to the decomposition of sericin and can be subjected to extraction treatment. In the case of wool, isopropanol is preferred because it can be easily extracted. In the case of hot water, the extraction speed is low, but it can be used by selecting the conditions. By using these liquids, it is possible to carry out an extraction treatment with the possibility of discharging harmful substances to the environment as low as possible. In addition, if these liquids are alkaline, the strength of the coating becomes weaker, probably because the extracted components are decomposed and the molecular weight becomes smaller, and when used as a reinforcing material, the strength of the coating layer itself becomes weaker and it is easily broken. More likely to happen.

The fiber for molding material of the present invention is mixed with a fiber having a relatively low melting point serving as a matrix, a resin, or the like, and formed into a fiber aggregate such as a web or a nonwoven fabric, or heated and melted, and then subjected to molding. Can be done.

When the cellulosic fiber not treated with the component extracted from the natural fiber in the present invention is thermoformed together with a base material such as PP fiber or resin, the odor estimated to be a decomposition product of pectin in the processing step is obtained. Occurs, and a problem such as the odor remains in the processed product, but according to the present invention,
When bast fibers such as kenaf and cellulose fibers are treated with an extract containing sericin, keratin, etc., and the fiber is formed at least partially with an extract containing sericin, keratin, etc., this odor is generated. Can solve the problem. For example, when sericin is used as the extract, it is presumed that the degradation of pectin is suppressed by covering the surface of the hydrophilic organic fiber with a coating of a component having a higher melting point than pectin. Therefore, when molding at a temperature higher than the decomposition temperature of pectin of about 190 ° C., the film formation according to the present invention is particularly effective.

[0013] The effective thermoforming temperature of the present invention is preferably substantially at a temperature lower than 240 ° C, which is the decomposition temperature of the extract from natural fibers in the present invention. Even if the processing temperature is higher than this, devising to reduce the heat history by means such as suppressing heat conduction to the inside, the internal temperature is substantially lower than the decomposition temperature of the natural fiber extract. The present invention can be effectively used if care is taken not to increase the height.

[0014]

EXAMPLES The present invention will be described below in more detail with reference to examples, but the present invention is not limited to only these examples. Example 1 and Comparative Example 1 1 g of jute fiber and 0.3 g of silk sericin were added with an amount of DMSO capable of immersing a solid content, and the mixture was left at room temperature for 15 minutes.
Subsequently, the jute fiber and the swollen silk sericin were separated, put into a pressure bottle, and 50 ml of DMSO was added thereto.
For 15 minutes. By this treatment, silk sericin was dissolved in DMSO to form a random coiled conformation and adhered to the jute fiber. Table 1 shows the fiber properties before and after the treatment.

[0015]

[Table 1] Surprisingly, tensile strength, modulus and elongation all improved.

Example 2 and Comparative Example 2 20% by mass of the fibers of Example 1 and Comparative Example 1 were mixed with 80% by mass of maleic modified PP fiber by a card method, and flat plates were formed at 220 ° C. . The following results were obtained, in which the product obtained by molding the fiber of Example 1 was Example 2, and the product obtained by molding the fiber of Comparative Example 1 was Comparative Example 2. In the process of molding the untreated product, there was a strong smell of burning cellulose, and there was a residual smell even after cooling.

[0017]

[Table 2]

[0018]

The fiber for molding material of the present invention is an organic fiber-based reinforcing fiber, has no problem of generation of odor due to thermoforming, has excellent adhesion to a base material, and has an excellent reinforcing effect. . The molding material using the fiber for molding material of the present invention as a reinforcing fiber can form a molded article having excellent strength and elastic modulus even in an organic-organic system, and is an environmentally friendly material at the time of disposal in the manufacturing process and after use. It is useful for a wide variety of applications such as automobiles, furniture, and building materials.

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Claims (7)

[Claims] 1. A fiber for molding material, wherein at least a part of the surface of the organic fiber is coated with a component extracted from natural fiber. 2. The molding material fiber according to claim 1, wherein the component extracted from the natural fiber is sericin or keratin. 3. The method according to claim 1, wherein the organic fibers are hemp, jute, kenaf,
3. The fiber for molding material according to claim 1, wherein the fiber is a cellulosic fiber such as manila hemp. 4. A fiber-reinforced molding material comprising the molding material fiber (A) according to claim 1 and a thermoplastic fiber (B) and / or a resin (C). . 5. The fiber-reinforced molding material according to claim 4, wherein at least one of the thermoplastic fiber (B) and the resin (C) is polypropylene. 6. The fiber-reinforced molding material according to claim 5, wherein at least a part of the polypropylene is maleic-modified. 7. A molded product obtained by thermoforming the fiber-reinforced molding material according to claim 4.