JPH11147220A - Chlorinated vinyl chloride resin composition and molded body using the composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a CPVC composition of superior processability and thermal stability and also manufacture a molded body using the composition. SOLUTION: A chlorinated vinyl chloride resin monomer of 60-70 wt.% chlorine content or a mixture formed of vinyl chloride resin, a stabilizer, a lubricant, a filler and an impact strengthening agent altogether is melt kneaded by a biaxial direction extruder with a crosspiece-shaped breaker plate to manufacture a chlorinated vinyl chloride resin composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a heat-resistant chlorinated vinyl chloride resin composition and a molded article using the same.

[0002]

2. Description of the Related Art Chlorinated vinyl chloride resin (hereinafter referred to as CPV)
C) is generally a vinyl chloride resin (hereinafter referred to as PVC).
Chlorination). CPVC retains flame-retardant and chemical-resistant properties, which are said to be advantages of PVC, and
C is expected to be used in a wide range of applications because it has improved the low heat resistance temperature which is said to be a disadvantage of C. On the other hand, PVC has a serious drawback that it cannot be used at temperatures of 60 to 70 ° C. or higher because of its low heat deformation temperature. On the other hand, the heat deformation temperature of CPVC is higher by 20 to 40 ° C. than that of PVC, and the heat resistance, which is a drawback of PVC, is improved. Therefore, CPVC is also widely used in automotive applications. For example, weather strips for air-tightness around window glass, and roof and side modules mounted on ceilings and side surfaces of vehicle bodies.
Is widely used for

Conventionally, a weather strip or a roof molding is made of a soft PVC resin or a metal such as stainless steel.
What was combined with rubber etc. was used. But,
In recent years, there has been a problem in terms of weight reduction of vehicles and recyclability due to environmental problems, and it has been difficult to meet cost reduction requirements with conventional stainless steel and the like, and there has been a demand for resinization that can replace stainless steel.

In general, when a molded article is obtained using CPVC, it is molded using a powder or a granulated pellet. However, pelletized CP
The VC composition has a problem in that its processability and thermal stability are inferior to those of a powdery composition.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and is intended to improve the workability and thermal stability of C.
Provided are a PVC composition and a molded article using the same.

[0006]

According to the present invention, there is provided a chlorinated vinyl chloride resin having a chlorine content of 60 to 70% by weight or a mixture thereof with a vinyl chloride resin, a stabilizer, a lubricant, a filler,
And the impact strengthening agent is melt-kneaded by a biaxially different direction extruder to which a bar-shaped breaker plate is attached.

As the CPVC used in the present invention, the average degree of polymerization of PVC before chlorination is preferably from 500 to 1400. If the average degree of polymerization is less than 500, the impact resistance decreases, and if it exceeds 1,400, the melt fluidity decreases, and molding becomes difficult.

The average chlorine content of CPVC is 60 to
Limited to 70% by weight. If the average chlorine content is less than 60%, the heat resistance decreases, and if it exceeds 70%, the fluidity greatly decreases, and molding becomes difficult. Similarly, when used in combination with PVC, the average chlorine content is limited to 60 to 70% by weight.

Examples of the stabilizers include commonly used lead stabilizers, tin stabilizers such as dibutyltin malate and dibutyltin mercapto; silicates, composites with silicic acid; hydrotalcites And the like can be used.

Examples of the lubricant include stearic acid, oleic acid and metal salts thereof such as magnesium and calcium; aliphatic hydrocarbons such as paraffin wax and polyethylene wax; monoalcohol fatty acid esters such as butyl stearate; Glycerin monostearate, glycerin tristearate, and other polyhydric alcohol fatty acid ester-based lubricants are included.

Examples of the filler include calcium carbonate, clay, talc and the like.
For example, an MBS resin of a methyl methacrylate / butadiene / styrene copolymer, an ABS resin of an acrylonitrile / butadiene / styrene copolymer, a chlorinated polyethylene and the like can be mentioned.

In the present invention, as additives other than those described above, a polymethyl methacrylate-based processing aid, an antioxidant, an ultraviolet absorber, an antistatic agent, a pigment and the like may be appropriately added.

The method for obtaining the CPVC composition of the present invention as pellets is as follows. The above resin, stabilizer, lubricant and impact enhancer are uniformly mixed by a super mixer, and a cross-shaped extruder is used in a biaxially different direction using a cross-shaped breaker plate. Extrusion molding is performed with a pellet mold, and the CPVC composition that has come out of the pellet mold is cut with a pellet cutter.

In the present invention, a twin-screw extruder is used as an extruder. The size of the twin-screw extruder is not limited, and any twin-screw extruder can be used. In a single-screw extruder or a twin-screw extruder, the thermal stability is greatly impaired,
Problems such as deterioration in workability may occur. The screw of the twin-screw extruder is preferably a general full-flight screw, and the barrel may be either of a parallel type or a conical type. Moreover, the crosspiece-shaped breaker plate of FIG. 2 is used for the breaker plate. At present, generally, a breaker plate having a large number of holes in a honeycomb shape as shown in FIG. 3 (hereinafter, usually referred to as a breaker plate) is used, but a large pressure is applied, which is not suitable for CPVC. The use of a bar-shaped breaker plate greatly reduces the load on the extruder during pellet production, lowers the resin temperature, increases the extrusion rate compared to a normal breaker plate, and greatly improves productivity.

On the other hand, in the case of a single-screw and twin-screw extruder, the resin temperature becomes extremely high, and if a molded article such as a weather strip is to be obtained, the surface properties are poor, the decomposition time is short, and the production is stable. Can not do. The material of the bar-shaped breaker plate is not particularly limited, and a usual material is used. The width of the shape A portion in FIG. 2 is not particularly limited, and a wide width may be used in some cases. However, the basic shape is as shown in FIG.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Examples 1 to 4, Comparative Examples 1 to 5) A resin composition obtained by uniformly mixing the components having the compounding amounts shown in Tables 1 and 2 with a super mixer was measured at a cylinder temperature of (C
1: 150 ° C, C2: 160 ° C, C3: 170 ° C, C
4: 175 ° C.), the adapter temperature was set to 170 ° C., and the die temperature was set to 170 ° C., supplied to each extruder, and cut with a pelletizer to obtain pellets. The obtained pellets were wound around a roll at 190 ° C. for 3 minutes to prepare a roll sheet, and the roll sheet was put into a 200 ° C. gear oven, and the time (minute) until blackening was measured to determine the aging heat stability.
The results are shown in Tables 1 and 2.

Next, the pellets were subjected to a 65 mm single extruder (L / D = 22, full flight screw, compression ratio =
3.0), the barrel temperature was set to (B1: 150 ° C., B
2: 160 ° C., B3: 170 ° C.), and the die temperatures are respectively (DH: 175 ° C., D1: 175 ° C., D2: 1).
Extrusion molding was performed under the conditions set at (85 ° C.), and the surface state of the obtained molded body was visually observed and ranked as shown below. ◎: Very smooth and good surface 良好: Good ：: Slight undulation ×: Large undulation XX: Very bad.

The following raw materials shown in Tables 1 and 2 were used. * 1 CPVC: manufactured by Tokuyama Sekisui Industry Co., Ltd. (average degree of polymerization of raw material 1,000, chlorine content 64% by weight) * 2 PVC: TS-1,000R manufactured by Tokuyama Sekisui Industry Co., Ltd. (average degree of polymerization 1,000)

Tribasic lead sulfate: TL-7,000 manufactured by Sakai Chemical Industry Co., Ltd. Lead stearate: SL-1,000 manufactured by Sakai Chemical Industry Co., Ltd. Calcium silicate: manufactured by Mizusawa Chemical Co., Ltd. MBS: BTA- manufactured by Kureha Chemical Industry Co., Ltd. 751 polyethylene wax: Mitsui Petrochemical Industry Co., Ltd. Mitsui High Wax 200P (average molecular weight 2,000) montanic acid wax: Hoechst Wax OP manufactured by Hoechst Japan

* 3 Twin screw extruder: Toshiba Machine Co., Ltd. (TEC-6
5) * 4 Twin screw extruder: Toshiba Machine Co., Ltd. (TED-95)
CVA) * 5 Single-screw extruder: Ikegai Co., Ltd. (FS-90) * 6 Twin-screw extruder: GT-11 (GT-11)
0)

[0022]

[Table 1]

[0023]

[Table 2]

As is evident from the results of Examples 1 to 4 in Table 1, the pellets obtained by using a bar-shaped breaker plate with a twin-screw extruder are heat-stable and have a good shape. Good surface properties. On the other hand, in Comparative Examples 1 to 5 in Table 2, the load (Amp) at the time of pellet preparation was used.
In addition, the obtained pellets have a very high resin temperature at the time of preparation, and thus have poor thermal stability, and the molded article obtained by extrusion has poor surface properties.

[0025]

The CPVC composition of the present invention can be used as pellets having a low load at the time of production, a large extrusion rate, and excellent heat stability by using a twin-screw extruder having a bar-shaped breaker plate. can get. Therefore, the CPVC composition is suitably used for weather strips having excellent surface properties, molded articles of roof moldings, and the like.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a weather strip.

FIG. 2 is a schematic perspective view of a bar-shaped breaker plate.

FIG. 3 is a plan view of a normal breaker plate.

[Explanation of symbols]

 1 Stainless or chlorinated vinyl chloride resin 2 Soft vinyl chloride resin 3 Glass

Claims (4)

[Claims] 1. A bar-shaped breaker plate comprising a chlorinated vinyl chloride resin having a chlorine content of 60 to 70% by weight or a mixture thereof with a vinyl chloride resin alone, a stabilizer, a lubricant, a filler, and an impact reinforcing agent. A chlorinated vinyl chloride resin composition characterized by being melt-kneaded by a twin-screw, bidirectional extruder. 2. A chlorinated vinyl chloride resin composition, wherein the chlorinated vinyl chloride resin composition is a pellet. 3. A molded article obtained by using the chlorinated vinyl chloride resin composition according to claim 1 or the pellet according to claim 2. 4. The molded article according to claim 3, wherein the molded article is used for a weather strip or a roof molding.