JPH064720B2 - Mixed material for thermoplastic resin and resin molding - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thermoplastic resin admixture and a resin molded product that are mixed in a thermoplastic resin melt in order to improve the properties of the thermoplastic resin molded product. .

[Prior Art] In order to improve the characteristics of a thermoplastic resin molded product, reinforcing fibers such as cut glass fiber bundles (CS) or fillers such as talc and calcium carbide are mixed in a thermoplastic resin melt. It is known to mold.

For example, the strength of the resin molded body can be improved by mixing reinforcing fibers into the thermoplastic resin melt. The above-mentioned molded body is widely used as an FTP for electric parts, automobile parts and the like.

[Problems to be Solved by the Invention] When a mixed material such as a reinforcing fiber or a filler is mixed and molded into a thermoplastic resin melt, the thermoplastic resin is often deteriorated and colored.

Coloring can be prevented by mixing a fluorescent substance into the thermoplastic resin, but in order to effectively prevent coloring, it is necessary to mix a large amount of fluorescent substance, heat resistance, mechanical strength, etc. Is easy to decrease.

Further, it is difficult to uniformly mix the fluorescent substance and the thermoplastic resin, and the quality is likely to be uneven.

An object of the present invention is to solve the above problems of the prior art, to effectively prevent coloring of the resin body and to obtain a homogeneous resin body without using a large amount of fluorescent substance.

[Means for Solving the Problems] In order to achieve the above object, the present invention comprises a glass fiber bundle to which a treatment agent containing a fluorescent substance that absorbs ultraviolet rays to generate fluorescence is additionally focused. A mixed material for a thermoplastic resin is used, and this mixed material is mixed and molded into a thermoplastic resin melt to produce a resin body.

Further, as the mixed material, a cut glass fiber bundle in which a treating agent containing a fluorescent substance is added and focused on glass fiber is used.

Next, the present invention will be described more specifically.

As the fluorescent substance used in the present invention (the present fluorescent substance), it is desirable to use one that absorbs ultraviolet rays in the range of 300 to 380 nm to generate fluorescence, such as ultraviolet rays contained in sunlight (natural light) or illumination light. By the action of, it is possible to generate sufficient fluorescence to achieve the object of the present invention.

Also, it is desirable that the ratio E / Eo of the energy Eo of the ultraviolet rays absorbed and the energy E of the generated fluorescence is as large as possible,
A great effect can be obtained by using a small amount of fluorescent substance.

The optimum wavelength distribution of the generated fluorescence is determined by the type of thermoplastic resin used, processing conditions, etc.
Those that mainly emit fluorescence in the wavelength range of up to 600 nm are preferred.

Examples of such a fluorescent substance include benzoxazole,
Examples thereof include triazole compounds, coumarin compounds, pyrazoline compounds, styryl compounds, and naphthalimide compounds.

In the present invention, when a large number of glass fibers pulled out from the bushing are bundled, the present fluorescent substance is contained in advance in the treatment agent (binder) to be added to the glass fibers, and the present fluorescent substance is contained. A glass fiber bundle formed by additionally focusing the treatment agent (hereinafter referred to as the present treatment agent) on the glass fiber is used as a mixing material.

As the treating agent, those containing a film forming agent such as epoxy resin and urethane resin, a coupling agent such as an organic silicon compound, and a lubricant such as a surfactant can be preferably used.

The amount of the present fluorescent substance to be adhered to the glass fiber is appropriately 0.001 to 0.5 wt% of the glass fiber, preferably 0.005 to 0.2 wt%.

If this amount is too small, the effect of the present invention is not sufficient,
Further, if the amount is too large, the effect cannot be expected to be increased so much, but rather, defects such as deterioration of mechanical strength and heat resistance are likely to occur.

The mixed material coated with the present fluorescent material as described above is mixed and molded into the thermoplastic resin melt.

For example, a cut product (CS) of a glass fiber bundle formed by bundling the treatment agent and a thermoplastic resin melt are mixed by a kneading machine and extruded to form a rod-shaped product, which is obtained by cutting the rod-shaped product. Using the pellets as a raw material, a resin molded body having a desired shape can be obtained by injection molding.

When CS and the thermoplastic resin melt are mixed, a filler such as calcium carbonate can be mixed at the same time.

Further, the glass fiber roving or the mat-like material provided with the treatment agent is impregnated with the thermoplastic resin melt to mix the mixed material into the thermoplastic resin melt, and then the resin molding is formed by press molding. You can get

As the thermoplastic resin, PBT, PET, PP, PC, polyamide, AS, ABS and the like can be used.
It has been found that the effect is particularly great when a polyester resin such as BT or PET is used.

[Function] Decomposition of a thermoplastic substance when melt-molding a thermoplastic resin,
The coloring due to alteration is particularly remarkable at the interface between the thermoplastic material and the fusion reinforcing fiber, and is canceled by the fluorescence generated by the present fluorescent agent.

Further, fluorescence is generated by absorption of ultraviolet rays, but since ultraviolet rays are invisible light, coloring does not occur due to absorption of ultraviolet rays.

Example 1 A treating agent having the following composition (composition I) was used as a solid component.
30 parts by weight of cut glass fiber bundle with 0 wt% and PB
T70 parts by weight is kneaded at 260 ° C. to form pellets according to a conventional method, and JIS Z 8722 and Z8730 are prepared by using a color difference meter.
According to the b value of hue and the tensile strength of the test piece according to the method of ASTM D 638, the results are shown in the attached table.

Composition of treatment agent (I) PHR (trade name, manufactured by Sumitomo Chemical Co., Ltd.) 0.1 wt% Epoxy resin 10 wt% Aminosilane 0.6 wt% [Example 2] Instead of the PHR of Example 1, Kayalite OSN (trade name,
The results of conducting the same experiment as in Example 1 using Nippon Kayaku Co., Ltd. are shown in the attached table.

[Comparative Example 1] The contents of other components were the same as those of Examples 1 and 2, but PH
The results of the same experiment as in Example 1 using a treating agent containing no R or Kayalite OSN are shown in the attached table.

[Example 3] 30 parts by weight of the same glass fiber cut product as in Example 1, PET7
The results of the same experiment as in Example 1 using 0 part by weight are shown in the attached table.

[Example 4] The result of performing the same experiment as in Example 1 using the CS of Example 2 in place of the CS of Example 3 is shown in a separate table.

[Comparative Example 2] Although the contents of other components were the same as those of Example 3, PHR,
The results of conducting the same experiment as in Example 1 using a treating agent containing no Kayalite OSN are shown in a separate table.

[Advantages of the Invention] The use of a small amount of a fluorescent substance can effectively prevent the thermoplastic resin molding from being colored and obtain a homogeneous resin body without lowering the performance such as strength and heat resistance.

Claims (4)

[Claims] 1. A mixing material for a thermoplastic resin, which comprises a glass fiber bundle to which a treatment agent containing a fluorescent substance which absorbs ultraviolet rays and emits fluorescence is additionally focused. 2. The mixed material for a thermoplastic resin according to claim 1, wherein the mixed material is a cut product of a glass fiber bundle obtained by bundling glass fibers with a treatment agent containing a fluorescent substance. 3. A resin molding obtained by mixing and molding a mixed material composed of a glass fiber bundle, which is bundled with a treatment agent containing a fluorescent substance that absorbs ultraviolet rays to generate fluorescence, into a thermoplastic resin melt. . 4. The resin molded body according to claim 3, wherein the mixed material is a cut product of a glass fiber bundle in which a treating agent containing a fluorescent substance is added and focused on glass fiber.