JPS58132038A - Wear-resistant styrene resin composition and production thereof - Google Patents

Abstract

PURPOSE:To obtain a styrene resin compsn, having excellent wear resistance and a smooth surface by a simple operation, by spreading a silicone oil on the surface of styrene resin pellet, and kneading the pellet and glass beads by using a single screw extruder. CONSTITUTION:1-6pts. wt. silicone oil is mixed with 100pts.wt. styrene resin pellet such as polystyrene or ABS resin by means of a tumbling mixer to spread the silicone oil on the surface of the pellet. 5-35pts.wt. glass beads having a weight-average particle size of 5-50mum are kneaded with said silicone oil- spread styrene resin pellet by using a single screw extruder to obtain the desired wear-resistant styrene resin compsn. Glass beads whose surface is treated with an acrylsilane or an aminosilane, are preferred.

Description

[Detailed description of the invention] The present invention relates to a wear-resistant styrenic resin composition.

Styrenic resins, i.e., polymers such as polystyrene obtained by polymerizing aromatic vinyl monomers such as styrene and α-methylstyrene alone, aromatic vinyl monomers listed above, and copolymers with these monomers. Copolymers such as AS resin obtained by copolymerizing with possible monomers such as acrylonitrile, methacrylonitrile, etc., aromatic vinyl monomers and monomers copolymerizable with these, rubber-like elastic bodies such as polybutadiene, etc. Copolymers such as ABS resins made by graft copolymerizing polymers have good moldability and impact resistance. It is widely used because it has chemical resistance.

Conventionally, these resins have insufficient wear resistance, so
Measures were taken such as adding inorganic fillers such as glass peas.

In particular, since glass beads are spherical, even when blended with styrene resin, etc., there will be no anisotropy in the physical properties of the product and molding.
It has characteristics such as a smooth surface compared to fibrous fillers, but when kneading with styrene resin, etc., the resin is in the form of a pellet, making it difficult to use a general single-screw extruder, etc. Since uniform dispersion cannot be achieved using conventional equipment, it has been necessary to use large-scale equipment such as a Bumper'J-mixer or a pressure kneader, or to use powdered resin.

The present inventors have conducted extensive research with the aim of solving the problems of the prior art described above and developing a styrenic resin composition with better wear resistance and a smoother surface, and a simpler manufacturing method. As a result of repeated efforts, the present invention was arrived at.

A seventh object of the present invention is to provide a styrenic resin composition with excellent abrasion resistance and a smooth surface. ~35 parts by weight and l silicone oil
This is achieved by a wear-resistant styrenic resin composition containing 6 parts by weight.

A third object of the present invention is to provide a method for producing a styrene resin composition with excellent abrasion resistance and a smooth surface by a simple operation. In a method of manufacturing a wear-resistant styrenic resin composition by blending glass beads into a resin, 100 parts by weight of styrene resin pellets are mixed with 7 to 6 parts by weight of soric oil and 5 parts by weight of glass beads. ~35
This can be achieved by kneading parts by weight using a single screw extruder.

The glass beads used in the present invention have a weight average particle size of 5-
Soum, preferably 5 to 20 um, is suitable, and those whose surface has been treated with acrylic silane, glycido silane, amino silane, etc. are more preferred.

The blending ratio of glass beads is polystyrene, AS resin,
5 to 3 per 100 parts by weight of styrene resin such as ABS resin
A suitable amount is 5 parts by weight, more preferably 10 to 30 parts by weight.

The shape of the styrenic resin may be pellets, that is, particles with a size comparable to those of average size, or powder, but there is no particular problem, but pellets are easier to handle.

If the blending ratio of glass beads is less than 5 parts by weight, the abrasion resistance will not improve much, and if it exceeds 35 parts by weight, the dispersion of the glass beads in the styrene resin will be poor, which is not preferable.

The silicone oil may be a conventional polyalkylsiloxane or polyarylsiloxane, and the amount added is preferably 1/-A parts by weight per 10θ parts by weight of the styrene resin.
, 5 to 3 parts by weight is suitable.

If the amount is less than 1 part by weight, the effect of adding silicone oil will not be obtained, and if it exceeds 6 parts by weight, peeling will occur on the surface of the styrene resin molded product and the molding shrinkage rate will increase, which is not desirable.

A composition in which glass beads and silicone oil according to the present invention are blended has a lower coefficient of friction and improved wear resistance than a composition in which glass beads are simply blended with a styrene resin. That is, the wear loss due to the worn wheels, which will be described later, is significantly reduced, and the synergistic effect accompanying the addition of silicone oil is significant.

The composition according to the present invention is prepared by adding predetermined amounts of styrene resin, glass beads, and silicone oil to a Banbury mixer.
Of course, it can also be produced by kneading with rolls, pressure kneaders, etc., or by kneading with a single-screw extruder using powdered resin, but it can also be produced using a single-screw extruder without using the easy-to-handle Pentz powdered resin. This makes it possible to cross-wire and disperse the glass beads uniformly. In this case, it is desirable that the glass peas be placed in the hopper of a single-screw extruder together with the pellets. According to this method, there is no need to use large-scale equipment and equipment (the industrial value is extremely large). .

Next, the present invention will be explained in more detail based on 1. Examples and Comparative Examples.

In addition, in the examples and comparative examples, the wear resistance is J-5K.
The abrasion loss was measured according to the plastic abrasion test method using an abrasion wheel specified in -710'l. In this case, measurements were made for two types of wear wheels: one using abrasive material H-1 and one using carbon steel (J9!RO).

Further, the friction coefficient was measured by attaching the sample to a 3F inclined surface and using a weight made of carbon steel (SYSA) with weight/7'1.2, r and contact area//cal.

Example / ABEI resin (Tufflex manufactured by Mitsubishi Monsanto Chemical)
2IO, TAFLEX are registered trademarks of the company) PELLETET 100
Silicone oil (manufactured by Toray Silicone, SH) in the weight part
-kooo viscosity lko, so.

45 parts by weight of ap) were added and mixed in a tumbler mixer.

ABS resin pellets and glass beads (manufactured by Toshiba Balloteini ■, FiGB7.
? 10. Alkali glass beads, acrylic silane treatment)
/ 7.4 parts by weight, screw diameter 4' 0 *ms
L/D (screw outer diameter-shaft length ratio) Kneaded at a cylinder temperature of 230°C using a single-screw extruder. The obtained pellets were injection molded to prepare samples and their physical properties were measured.

Static friction coefficient 0.15, dynamic friction coefficient 0. / 3. Wear loss is wear wheel H-1g, load/θoog, number of tests 100
Measured under the condition of 0 times (hereinafter referred to as "H-ig wear loss"), 2! ; Om9, wear wheel S IIS C, load/300g, number of tests qoo.

It was measured under the conditions of 541SC (hereinafter referred to as "541SC abrasion loss") and found to be 0 m9.

Example ABS resin pellet 10 similar to that used in Example 1
7.6 parts by weight of silicone oil and 11 parts by weight of glass beads were kneaded with respect to θ parts by weight in the same manner as in Example 1 to produce an ABS resin composition containing glass beads.

The static friction coefficient of the sample prepared using this composition was 0. /
&, the coefficient of dynamic friction is 0. /3, H-/II wear loss is 21
．． Q■, E19jO abrasion loss was O~.

Example 3 100 parts by weight of ABS resin pellets, 3.75 parts by weight of silicone oil, and 25 parts by weight of glass peas were kneaded in the same manner as in Example 1 to produce ABS containing glass peas.
A resin composition was produced. Note that the ABEI resin, silicone oil, and glass beads are the same types as those used in Example 1.

Static friction coefficient 0. /g, dynamic friction coefficient O1/3, H-/g
Wear loss: 230~, BQ! 10 The wear loss was θ■.

Comparative Example 1 When the physical properties of the ABS resin used in Example 1 were measured,
The static friction coefficient was 0.1g, the dynamic friction coefficient o, iq, H-1g abrasion loss boom 9.5tisa abrasion loss λj~.

Comparative Example An ABS resin composition containing glass beads was produced in the same manner as in Example except that silicone oil was not added.

The resulting composition had a static friction coefficient of 0.1 g, a dynamic friction coefficient of (7/?, H-/g abrasion loss 0~, 5ttsc abrasion loss 15 m9).

Comparative Example 3 An ABS resin composition containing glass beads was produced in the same manner as in Example 3 except that silicone oil was not added.

The static friction coefficient of the obtained product is o, iza, and the kinetic friction coefficient is θ.
,/ri, H-/g abrasion loss was 390m9.5tisc abrasion loss was 1gmg.

Example: As resin (Mitsubishi Monsando Kasei Sunrex-H1
7 parts by weight of the same silicone oil halo as in Example 1 was added to 10 parts by weight of Sunrex (registered trademark) pellets and mixed in a tumbler mixer. The obtained mixture and 1 part by weight of glass peas (same as in Example) were kneaded at 3θ°C using the single screw extruder used in Example 1.

The static friction coefficient of a sample injection molded using the obtained composition was 0. /II, the dynamic friction coefficient was 0.13, the H-1g abrasion loss was or9, and the sysa abrasion loss was Q~.

Note that the static friction coefficients of the As resin used in this example are o, i
g, dynamic friction coefficient is 0.2g, H-1g wear loss is /
50 m9, Sg, 5-0 wear loss was Ov.

Comparative Example Dashi 1 Glass beads-containing As resin composition pellets were produced in the same manner as in Example q except that no Nacon oil was added.

The static friction coefficient of this composition is 0. / 7, Dynamic friction coefficient is 0.2g%H-/g wear loss/10m9, and SSC
Wear loss is /! ; It was m9.

Claims (2)

[Claims] (1) A wear-resistant styrenic resin composition comprising 709 parts by weight of styrene resin and 5 to 35 parts by weight of glass beads and 7 to 6 parts by weight of silicone oil. (2) In a method for producing a wear-resistant styrenic resin composition by blending glass beads with a styrenic resin,
Styrene resin pellets with 10θ parts by weight spread with 7 to 6 parts by weight of courageous silicone oil and 5 to 5 parts by weight of glass beads.
3! A method characterized in that part by weight of f is kneaded using a single screw extruder.