JPH08134301A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE: To obtain a vinyl chloride resin composition having good heat resistance and a synergistically excellent smoking-preventing effect even in a high temperature processing condition by adding both a specific molybdenum compound and magnesium hydroxide to a vinyl chloride resin. CONSTITUTION: This composition comprises (A) 100 pts.wt. of a vinyl chloride resin, (B) >=1 pt.wt. of a molybdenum compound selected from molybdenum oxide and ammonium molybdate, and (C) >=1 pt.wt. of magnesium hydroxide, wherein the total amount of the components B and C is <=20 pts.wt. The composition preferably comprises 100 pts.wt. of the component A, 2-8 pts.wt. of molybdenum oxide or ammonium molybdate, and 2-8 pts.wt. of the component C, wherein the total amount of the components B and C is 10-15 pts.wt. The components B and C preferably have an average-particle diameter of 0.5-2μm, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transportation equipment such as aircrafts, ships and vehicles, interior / exterior materials for low buildings, window frames, partitions, etc., furniture, office equipment, or home appliances / electronic equipment housings. More specifically, the present invention relates to a hard vinyl chloride resin composition having both heat resistance during processing and low smoke generation related to fire safety.

[0002]

2. Description of the Related Art Molybdenum trioxide (MoO ₃ ), ammonium octamolybdate ((NH ₄ ) ₄ Mo ₈ O ₂₆ ), zinc molybdate (ZnMoO ₄ or Zn ₃ Mo ₂ O ₉ ) smokes PVC. It is known that it has an inhibitory effect (Polymer Digest 1994.
page). Further, a zinc-containing molybdenum compound having talc as a core material and a molybdenum compound having aluminum hydroxide as a core material have been used as smoke suppressants in hard vinyl chloride formulations.

[0003]

[Problems to be Solved by the Invention] Hard vinyl chloride type
The composition contains no or almost no plasticizer, and
It is recommended to use high-viscosity MBS and acrylic impact modifiers.
Rend and slippery to ensure thermal stability
Since poor dibutyltin malate is used, kneading and
The processing temperature in the forming process is so-called soft vinyl chloride
Much higher than in the case of the system composition, often 200 ℃
There are times when it reaches the above.

Under such a high heat condition, the zinc component becomes a thermal decomposition catalyst of the vinyl chloride resin, and is easily colored by heating, so that the recycling of the composition becomes very difficult. Further, in continuous production over a long period of time, stable production is difficult, and in extreme cases, the machine may be damaged due to the decomposition of PVC. Further, when aluminum hydroxide is used, it may partially decompose and foam under high heat processing conditions, which may lead to deterioration of the appearance of the molded product and deterioration of quality.

As described above, it has been very difficult from the conventional knowledge to come up with a suitable smoke suppressing composition for the problem of enhancing the low smoke generating property of the hard vinyl chloride composition. The present inventors have dealt with this problem, and while conducting various studies, it is quite unexpected, but in single use, by combining two types of compounds having relatively small smoke suppression properties, high heat processing conditions Has good heat resistance even under
In addition, they have found the result of exhibiting a reciprocally excellent effect with respect to smoke suppression, and arrived at the present invention.

[0006]

According to the present invention, one or more molybdenum compounds selected from molybdenum oxide and ammonium molybdate and 1 part by weight or more of magnesium hydroxide are added to 100 parts by weight of vinyl chloride resin. And, a low smoke-producing hard vinyl resin composition characterized in that the total amount thereof is blended within 20 parts by weight is presented. (Preferably, molybdenum oxide, ammonium molybdate 2 to 8 parts by weight, magnesium hydroxide 2 to 8 parts by weight,
Total amount within 10-15 parts by weight. )

The vinyl chloride resin used in the present invention is
Straight PVC having an average degree of polymerization of 7 to 11 million is used, but various copolymers may be used as a matter of course.

The molybdenum oxide used in the present invention has an average particle size of 0.5 to 5.0 μm, preferably
It is within the range of 0.5 to 2.0 μ. Ammonium molybdate used in the present invention has an average particle size of 0.5 to 5.0 μm.
In the range of m, it is preferably in the range of 0.5 to 2.0 μ. The average particle diameter of the magnesium hydroxide used in the present invention is in the range of 0.5 to 5.0 μm, and preferably 0.
It is within the range of 5 to 2.0 μ.

If the total amount of these additives is 20 parts by weight or more, the mechanical properties of the final product, the impact strength, the vacuum pressure-air moldability, the stability during extrusion, and the like are impaired. In particular, in the case of products that place importance on impact strength, vacuum, and air-pressure moldability, it is desirable that the total amount of additives be 15 parts or less. Further, in order to realize a smoke emission that is practically sufficient, the total amount is preferably 10 parts or more. In this case, the practically sufficient low smoke emission is a level that passes the low smoke emission of the Federal Aviation Regulation, which will be described later.

In the hard vinyl chloride resin composition of the present invention, in addition to the above-mentioned compounding agents, impact resistance improvers, processability improvers, stabilizers, lubricants, colorants, fillers, antifungal agents, etc. Various known compounding agents can be used. Typical examples of the compounding amount among these are impact modifiers acrylic reinforcing agent 5 to 20 parts by weight processability improving agent acrylic processing aid 1 to 10 parts by weight stabilizer dibutyltin malate (polymer) 1 4 parts by weight Lubricants Fatty acid ester type 0.5 to 1.5 parts by weight Lubricants Polyethylene wax 0.1 to 0.5 parts by weight Coloring agent Titanium oxide 0 to 5 parts by weight

Example 1 Test mixes shown in Table 1 were kneaded with two rolls at 180 ° C. and then press-molded to prepare test pieces. Test Method and Conditions (1) Smoke Emission NBS Smoke Chamber Test (ASTM E-662-79) A box in which the above test piece of 76.2 mm x 76.2 mm was completely sealed (Example: 914.4 mm x 809. 6 mm x 91
Heat is applied to the 42.4 cm ² area of the test piece, supported vertically on the frame within 4.4 mm). At this time, under the condition of smoke combustion, adjustment is performed so that the heat quantity of 2.5 watts per 1 cm ² is applied. The light absorption by smoke generated by combustion is measured using a standard photometer for the light rays passing through the box. As smoke generation increases, so does light absorption.
The result is represented by the specific optical density obtained by considering the geometrical factor in this measured value. This test was compared by the result (Ds4.0) 4.0 minutes after the start of combustion. In addition, the acceptance line by the test is the Federal Aviation Administration (FAA: Federal Aviation) of the United States.
Federal Aviation Regulations (FAR: Federal Aviation)
Regs) Ds specified in 25.853
It was decided that 4.0 was 200 or less.

(2) Thermal stability test A thermal decomposition test was conducted under the following conditions using a Labo Plastomill manufactured by Toyo Seiki Seisakusho. Jacket temperature conditions 200 ° C. Rotation speed 30 rpm Filling amount 80% of jacket capacity Thermal stability was compared by the time until the thermal decomposition of the resin starts and the torque rises.

(3) Replenishment of stability test contents during extrusion Extrusion conditions Extrusion under the following conditions was carried out using the test composition shown in Table 1 in a 40 mmφ single screw extruder equipped with a coat hanger type T dust. I did a test.

Examples 2 to 3 and Controls 1 to 6 Test pieces were prepared in the same manner as in Example 1 with the formulations shown in Table 1 and subjected to the same tests.

[0015]

[Table 1]

As is clear from Table 1, the vinyl chloride resin composition of the present invention has good heat resistance even under high heat processing conditions, and has a reciprocal excellent effect of suppressing smoke emission. To do.

Claims (2)

[Claims] 1. One or more molybdenum compounds selected from molybdenum oxide and ammonium molybdate and magnesium hydroxide per 100 parts by weight of vinyl chloride resin.
A low-smoke-proof, hard vinyl chloride resin composition, characterized in that 1 part by weight or more and a total amount thereof are mixed within 20 parts by weight. 2. Molybdenum oxide, ammonium molybdate 2 to 8 parts by weight, magnesium hydroxide 2 to 8 parts by weight, and a total amount of 10 to 15 parts by weight, based on 100 parts by weight of vinyl chloride resin. A vinyl chloride resin composition having low smoke generation, which is characterized by: