JPS585358A - Polysulfone resin composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. capable of producing moldings which have high strength and rigidity and in which thermal strain during molding is remarkably reduced and residual stress is very low, by blending glass beads and glass fiber is combination. CONSTITUTION:Pref. 20-50pts.wt. glass beads and pref. 5-50pts.wt. glass fiber are blended with 100pts.wt. polysulfone to obtain the titled compsn. Glass beads having an average particle size of 20mum or below, pref. 10mum or below are used. Glass fiber having a ratio of length l/diameter d of 10 or above, pref. 10-30 is used. Pref. said glass beads and said glass fiber are surface-treated with a silane coupling agent, such as aminosilanes or epoxysilanes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polysulfone resin composition, and more particularly to a polysulfone resin composition containing a combination of glass beads and glass fibers.

Polysulfone is a resin with excellent properties such as heat resistance and mechanical strength, and its properties are used as a molding material for various molded products. However, polysulfone's inherent properties often make it impossible to provide satisfactory molded products, and applications requiring higher heat resistance, strength, and even higher rigidity are increasing. Also,
For example, when polysulfone is injection molded, it undergoes large thermal strain during the cooling and solidification process, resulting in deformation over time.

As a method of improving the above-mentioned properties of polysulfone, it has been proposed to incorporate glass fiber into it.

However, when polysulfone containing glass fibers is injection molded, anisotropy occurs due to the orientation of the glass fibers, and depending on the shape of the molded product, not only is there a warping phenomenon, but also adverse effects on various physical properties based on the orientation of the fibers. cannot be avoided. Also,
It is also known that the properties of polysulfone can be improved by blending glass beads.

Although it was possible to improve the rigidity of the body, it had the disadvantage of decreasing strength.

The purpose of the present invention is to overcome the deficiencies of the prior art as mentioned above, and to provide high strength and high rigidity without being foolproof.

In particular, it is an object of the present invention to provide an improved polysulfone composition that can produce molded products with significantly reduced thermal strain during molding and extremely low residual stress.

The present invention is a polysulfone composition consisting of polysulfone, glass beads and glass fibers.

The glass beads used in the composition of the present invention have an average particle size of 20 μm or less, preferably 10 μm or less. If the average particle size exceeds 20 μm, it is difficult to obtain a satisfactory improvement in rigidity, and the skin of the resulting molded product becomes rough, which is not desirable. Further, the glass fibers to be blended into the composition of the present invention are advantageously those having a ratio t/d of length t to diameter d of 10 or more, preferably 10 to 30. If it is less than 10, the fiber reinforcing effect will be insufficient, which is not desirable.

In order to effectively achieve the object of the present invention, it is preferable to add and blend 20 to 50 parts by weight of glass peas and 5 to 50 parts by weight of glass fiber to 100 parts by weight of polysulfone. If the amount of glass beads is less than 20 parts by weight, the rigidity will not be sufficiently improved, and it will be difficult to suppress the occurrence of anisotropy due to the glass fiber blend. Further, if the weight ratio exceeds 50, the strength decreases, which is not desirable. If the glass fiber content is less than 5 parts by weight, the reinforcing effect of polysulfone will be insufficient, and if it exceeds 50 parts by weight, anisotropy will occur and the molded product will deform over time due to residual stress during molding, resulting in a decrease in the precision of the molded product. and undesirable.

Furthermore, the above-mentioned glass beads and glass fibers used in polysulfone can be added and mixed as they are, but in order to increase the affinity between these glasses and polysulfone, the beads and fibers are surface-coated with a silane coupling agent. Preferably, it is treated. What is a silane-based coupling agent? 1. Any commonly known silane-based coupling agent can be used as long as it improves the interfacial adhesion of glasstopolysulfone. 1. Typical examples include aminosilane and epoxysilane. etc. 0
Only one of the beads and fibers may be surface-treated, or each may be treated with a different coupling agent. Furthermore, mixing polysulfone with glass beads and glass fibers.

Any mixing means may be used; for example, a mixing roll, a panburi mixer, a kneader, a screw extruder, etc. can be conveniently used. Note that the t/d of the glass fibers in the present invention refers to those after mixing.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Examples 1 to 17 and Comparative Examples 1 to 17 Polysulfone compositions of various compositions were prepared.

The compositions of the present invention are summarized in Table 1 below, and the comparative compositions are summarized in Table 2.

Each composition in the table was mixed and extruded at a temperature of 280° C. using a single-screw vented extruder, and the resulting pellet was molded using an injection molding machine to prepare a test piece.

Table 1 Table 2 Figure 1 is a longitudinal cross-sectional view of a test piece, and when this test piece is continuously heated to a temperature of 90°C, the angle θ in the figure is smaller than the angle Δθ that changes depending on the elapsed time t. Heat deformation resistance due to residual stress during molding was measured. FIG. 2 is a graph plotting the relationship between the angle change Δθ and the elapsed time t for each composition test piece of the present invention shown in Table 1. In addition, Figure 3 shows 0.5kg of heat deformation resistance in order to measure the heat deformation resistance under more severe conditions.
This is a vertical cross-sectional view showing the state when using the weight 1 of 1, and the test temperature is the same 90°C. FIG. 4 is a graph plotting the relationship between the angle change Δθ' and the elapsed time t' when each test piece of the composition of the present invention is used with a weight, similar to FIG. 2. Note that the units of Δθ and Δθ' are minutes (angles), and 1 counterclockwise deformation is shown as positive, and clockwise deformation is shown as negative.

FIGS. 5 and 6 are graphs plotting the same test results as in FIGS. 2 and 4 above for test pieces of each composition of the comparative example shown in Table 2.

From these graphs, it is clear that the composition of the present invention can provide excellent high-precision molded products with extremely low residual stress during molding.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of a test piece for measuring residual stress.
FIG. 2 is a graph showing the test results of a test piece of the composition of the present invention, FIG. 3 is a vertical cross-sectional view similar to FIG. 1 when a weight is used, and FIG. 4 is a graph showing the test results. Figures 5 and 6
The Figures are respective graphs similar to Figures 2 and 4 for test specimens of comparative compositions. Figure 2: 1oo. The first muzu u wo 10o. Sanchizu (J 5Q□
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Claims (1)

[Claims] 1. A polysulfone composition containing a polysulfone resin, glass beads, and glass fibers. 2. 2 glass beads per 100 parts by weight of polysulfone
The polysulfone composition according to claim 1, which contains 0 to 50 parts by weight of glass fiber and 5 to 50 parts by weight of glass fiber. 3. The average particle size of the glass beads is 20 μm or less,
3. The polysulfone composition according to claim 1, wherein the ratio t/d of the length t to the diameter d of the glass fiber is 10 or more. 4. The polysulfone composition according to claim 3, wherein the glass beads have an average particle size of 10 μm or less. 5. The polysulfone composition according to claim 3, wherein the glass fiber has an l/d of 10 to 30. 6. The polysulfone composition according to any one of claims 1 to 5, wherein the glass beads and/or glass fibers are surface-treated with a silane coupling agent. 7. The polysulfone composition according to claim 6, wherein the silane coupling agent is aminosilane or epoxysilane.