JPS5837039A - Low-smoking flexible polyvinyl chloride composition - Google Patents

Abstract

PURPOSE:To provide a flexible PVC composition having suppressed smoking during combustion without deteriorating fire retardance, by mixing aluminum hydroxide, zinc borate, antimony trioxide and plasticizer therewith. CONSTITUTION:The titled compsn. is prepd. by mixing 30-80pts.wt. aluminum hydroxide, 1-15pts.wt. zinc borate, 3-30pts.wt. antimony trioxide and 20- 100pts.wt. plasticizer (e.g., trimellitate ester and/or adipate polyester having a viscosity of 150cps or above) with 100pts.wt. PVC. By mixing these components, especially by using said plasticizers, the compsn. having suppressed smoking during combustion can be obtained without deteriorating inherent properties and fire retardance of PVC.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-smoking flexible polyvinyl chloride coating composition. Soft polyvinyl chloride compositions usually have excellent flame retardancy, so they are widely used as various building materials, interior furnishings, and wire coating materials. .

The amount of smoke produced when burned is much higher than that of other polymer compositions, so it is definitely important from the standpoint of safety in the event of an actual fire.

It is currently in Hagi, which cannot be said to be a desirable material.

The most direct way to reduce the amount of smoke produced during combustion is to allow complete combustion, but this method has the disadvantage that the initial flame retardancy of the material is impaired, while other methods This involves increasing the amount of nonflammable substances (for example, inorganic fillers) in the composition, but this usually impairs the physical properties and processability of the composition.

In view of the current situation, the present inventors have conducted various studies on methods for reducing smoke generation during combustion without reducing the desired physical properties and flame retardance of polyvinyl chloride compositions, and have found that the patent claims The present invention was completed by discovering that the desired object could be achieved by using the flexible polyvinyl chloride composition shown in the above range.

The feature of the present invention is that aluminum hydroxide, zinc borate, and antimony trioxide are added to polyvinyl chloride resin, and trimellitic acid ester is used as the plasticizer of the present invention when soft plasticizing the polyvinyl chloride resin. Alternatively, a dicarboxylic acid polyester having a viscosity of 150 bits or more and a mixture thereof is used, or a plasticizer in which these components are the main components, that is, at least a portion of the total amount of the plasticizer used is the above-mentioned plasticizer. .

Typically, plasticizers for polyvinyl chloride include dialkyl phthalates, dialkyl adipates, chlorinated paraffins,
Chlorinated fatty acid esters are well known, but in the present invention,
These common plasticizers are not preferable for achieving the purpose of reducing smoke generation during combustion, as they impair flame retardancy and physical properties, and the above-mentioned trimellitic acid ester, viscosity 15
It is essential to use dicarboxylic acid polyesters having 0 cp'a or more and mixtures thereof, or it is essential to use the plasticizers of the present invention at least in proportion to the total amount of plasticizers used. Examples of the plasticizer of the present invention include tri-n-octyl trimellitate, tri-isooctyl trimellitate, and tri-(n-octyl trimellitate) as trimellitic acid esters.
-octyl-〇-gucyl) trimellitate and triisodecyl trimellitate, and examples of commercially available products include Fu? Morflex 500 by Iser Corporation (To). -510° -525, -530, Dainippon Ink Chemical Co., Ltd. Monocizer W-700, -705, -71O
L, =715L.

-720 is an example. Dicarboxylic acid polyester V having a viscosity of 150 cps or more includes sepatic acid polyester,
There are adipic acid polyesters and phthalic acid polyesters, and commercially available products include, for example, Polycizer p-29, -p-202, -w・4000 from Dainippon Ink Chemical Co., Ltd. -w-
2600+-w-2310°-w-1200,-w-+
Examples include 36DEL and -w-505FiLS.

The amount of these plasticizers used in the present invention is polyvinyl chloride resin 1
00 parts, the range is 20 to 100 parts, preferably 30 to 70 parts, and ordinary plasticizers may be used in combination with the plasticizer of the present invention within the range of the total plasticizer. good.

Zinc borate used in the present invention has the chemical formula 2Zn0.3820
Any commercially available product can be used as is, regardless of the manufacturer, as long as it has the formula 8·nH2O (2.5 in n). The amount of zinc borate used is 1 per 100 parts of polyvinyl chloride resin.
-15 parts, preferably 3-12 parts. If the amount used is less than the above range, the effect of the addition will be unfavorable, and if it is greater than the above range, no improvement in smoke suppression effect will be observed as the amount added increases, which is respectively unfavorable and unfavorable. .

The above-mentioned aluminum hydroxide may be manufactured by any manufacturer as long as it is aluminum hydroxide in the usual sense, but it goes without saying that those with fine particle size are preferable. The amount of aluminum hydroxide used is 20 to 100 parts, preferably 30 to 80 parts, per 100 parts of polyvinyl chloride resin. If the amount used is less than the above range, the effect of the addition will be poor, and if the amount is too large, the physical properties of the composition will be deteriorated, which is unsuitable. The antimony dioxide used in the present invention may also be 5b208 in the usual sense, for example, in the form of a paste,
It can be used in powdered form without any restrictions, and commercially available products include Kofu & Chi Chemical Company's Thermoguard 8,
-H, D-55 of Claremont Polychemical Co., pear 1
A commercially available product such as 0NOOR23A manufactured by Nalred may also be used.

In the composition of the present invention, in addition to the above-mentioned essential components, it is preferable to supplementally use the following additives from the viewpoint of improving the overall performance.

An example is a combination of silicified fatty acid ester, b) higher fatty acid B, and c) barium-zinc stabilizer. Said a
) is Epocizer w 100. of Dainippon Ink Chemical Co., Ltd. w 1008゜-w-128,-
w-121, and specific examples of b) include barium stearate and B8. Further, as a specific example of the above C), Mar
kLL, LH2-66 manufactured by Sakai Chemical Industry Co., Ltd., Interstub M7268A, -M7268 manufactured by Nippon Interstub Co., Ltd.
P, -M7268R and -M7268T.

In addition, relatively small amounts of clay as a filler and magnesium hydroxide as a scorch inhibitor may also be used in the compositions of the present invention, as required. The amount of clay and magnesium hydroxide used is 100% of polyvinyl chloride.
It is about 5 to 50 parts per part.

In addition to the above-mentioned additives, the low-smoke flexible polyvinyl chloride composition of the present invention may contain additives commonly used in polyvinyl chloride, such as Stable 11
, an inorganic filler, a lubricant, a pigment, a blowing agent, a softener, a plasticizer, etc. may be used in combination as necessary.Furthermore, the low smoke-emitting flexible polyvinyl chloride I composition of the present invention is usually It can be easily manufactured using mixing methods and equipment, and can be formed into any shape using processing methods such as extrusion, force V-under, injection, etc.
It can be used in the form of sheets, pipes, tapes, films, etc., and can be suitably used, for example, in building materials, interior materials, electric wire coatings, adhesive tapes, and various other industrial and supplies applications.

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

Examples 1 to 8, Comparative Examples 1 to 4 Polyvinyl chloride (manufactured by Mitsubishi Monsanto Chemicals; Vinica 57H) was used as the resin base material, and the compositions of the Examples and Comparative Examples shown in Table 1 were milled at 120°C. After uniformly mixing for 20 minutes, press molding at 170°C to a thickness of 3II.
A sheet sample of III+ was prepared. Next, the sample was used as a sample piece for measuring the limiting oxygen index (LOI) for flame retardancy evaluation according to JI8 K7201, and the LOI was measured according to the above method. In addition, the smoke generation test was conducted based on the method shown in JIS D 12Q1 at the oxygen concentration at the (LOI value + 0.5) point obtained above, with a minimum light intensity of 1. After determining the transmittance, the maximum attenuation coefficient (C%max) was calculated based on the following formula.

Ommax=(2,303/L)gof! (10 bites/
Tm i n ) (in the formula, light origin -0.5w, Tm1
n indicates the minimum transmittance.)

The results obtained are shown in Table 1.

Claims (1)

[Scope of Claims] I polyvinyl chloride resin and 30 to 80 parts of aluminum tetrahydroxide per 100 parts (parts by weight, same hereinafter) of the resin, 1
A low-smoking flexible polyvinyl chloride composition comprising ~15 parts of zinc borate, 3-50 parts of antimony trichloride, and 20-100 parts of a plasticizer. (2) The low-smoke flexible polyvinyl chloride composition according to claim 1, wherein the plasticizer is a trimellitic acid ester and/or an adipic acid polyester having a viscosity of 150 CF2B.