JPH0155295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-smoke flexible polyvinyl chloride composition. Soft polyvinyl chloride compositions are generally used as various building materials, interior furnishings, and wire coating materials because of their excellent flame retardancy, but when they burn, they emit a large amount of smoke compared to other polymer compositions.
The current situation is that it cannot necessarily be said to be a desirable material from the viewpoint of safety in the event of an actual fire. The most direct way to reduce the amount of smoke emitted during combustion is to allow combustion to occur completely, but the disadvantage of this method is that the initial flame retardancy of the material is impaired.
On the other hand, another method is to increase the amount of non-combustibles (e.g. inorganic fillers) in the polymer composition;
In this case, the physical properties and processability of the composition are usually impaired. 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 retardancy of polyvinyl chloride compositions, and have found that the patent claims The inventors have completed the present invention by discovering that the desired object can be achieved by using a 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 when the plasticizer is further soft plasticized, trimellitic acid ester or viscosity is used as the plasticizer of the present invention. A dicarboxylic acid polyester having 150 cps or more and a mixture thereof are used, or a plasticizer is used in which these components are the main components, that is, at least 1/2 or more of the total amount of plasticizer used is the above-mentioned plasticizer. Normally, dialkyl phthalates, dialkyl adipates, chlorinated paraffins, and chlorinated fatty acid esters are well-known as plasticizers for polyvinyl chloride, but in the present invention, we have developed a plasticizer that produces smoke when burned without impairing flame retardancy and physical properties. These conventional plasticizers are undesirable for achieving the objective of reducing
It is essential to use the above-mentioned trimellitic acid ester, dicarboxylic acid polyester having a viscosity of 150 cps or more, and mixtures thereof, or it is essential to use at least 1/2 or more of the total plasticizer used as the plasticizer of the present invention. As the plasticizer of the present invention, the trimellitic acid ester is trimellitic acid ester.
Examples of commercially available products include n-octyl trimellitate, triisooctyl trimellitate, tri(2-ethylhexyl) trimellitate, tri(n-octyl-n-decyl) trimellitate, and triisodecyl trimellitate. Morflex from Corporation (USA)
500, -510, -525, -530, Dainippon Ink Chemical Co.'s Monocizer W-700, -705, -710L, -715L, -
720 is an example. Examples of dicarboxylic acid polyesters with a viscosity of 150 cps or more include sebacic acid polyester, adipic acid polyester, and phthalic acid polyester, and commercially available products include Polysizer p-29, -p-202, -w and Dainippon Ink Chemical Co., Ltd.
4000, -w-2600, -w-2310, -w-1200, -w-
Examples include 360EL and -w-305ELS. The amount of the plasticizer used in the present invention is in the range of 20 to 100 parts, preferably 30 to 70 parts, per 100 parts of the polyvinyl chloride resin, and the amount used in ordinary plasticizers does not exceed 1/2 of the total plasticizer. may be used in combination with the plasticizer of the present invention. Zinc borate used in the present invention has the chemical formula 2ZnO.
Any commercially available product can be used as is, regardless of the manufacturer, as long as it is represented by 3B ₂ O ₃ .nH ₂ O (n≈2.5). The amount of zinc borate used ranges from 1 to 15 parts, preferably from 3 to 12 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 it is more than the above range, the smoke suppression effect will not improve as the amount added increases, which is not preferable. 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 addition effect will be poor, and if the amount is more than the above range, the physical properties of the composition will be deteriorated, and therefore these are unsuitable. The antimony trioxide used in the present invention is also
Any Sb ₂ O ₃ may be used, for example, in the form of a paste or powder, without any restriction. Commercially available products include Thermoguard S and -H from M&T Chemical Co., Ltd. and Claremont Polychemical Co., Ltd. D-
55, may be a commercially available product such as ONCOR23A manufactured by National Red Co., Ltd. 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. That is, in order to further improve the thermal stability of the composition of the present invention, lead-based, barium-based, tin-based, or composite stabilizers may be used; for example, preferred examples include a) epoxidized oil; Alternatively, a combination of three of epoxidized fatty acid ester, b) higher fatty acid Ba salt, and c) barium-zinc stabilizer can be exemplified. Specific examples of the above a) include Epocizer-w-100, -w-100S, and - manufactured by Dainippon Ink Chemical Co., Ltd.
w-128, -w-121, and specific examples of b) include barium stearate, such as BS manufactured by Kikuchi Shikoku Co., Ltd., and specific examples of c) described above include MarkLL manufactured by Adeca Argus, Sakai Chemical Co., Ltd. LBZ-66 manufactured by Kogyo Co., Ltd., Interstub M7268A, -M7268P, -M7268R and - manufactured by Nippon Interstub Co., Ltd.
M7268T is an example. The compositions of the present invention may also optionally contain a relatively small amount of clay as a filler and a relatively small amount of magnesium hydroxide as a scorch inhibitor. The amount of clay and magnesium hydroxide used is about 3 to 30 parts per 100 parts of polyvinyl chloride. In addition to the above, the low-smoking flexible polyvinyl chloride composition of the present invention requires additives commonly used in polyvinyl chloride, such as stabilizers, inorganic fillers, lubricants, pigments, blowing agents, softeners, plasticizers, etc. Depending on the situation, they may be used in combination. Furthermore, the low-smoke flexible polyvinyl chloride composition of the present invention can be easily manufactured using conventional mixing methods and equipment, and can be formed into any shape using processing methods such as extrusion, calendering, and injection.
It can be used in various forms such as pipes, tapes, and films, and can be suitably used, for example, in building materials, interior materials, electric wire coatings, adhesive tapes, and various other industrial products. 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 (Mitsubishi Monsanto Chemical Co., Ltd.; Vinica 37H) 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, the mixture was press-molded at 170°C to form a sheet sample with a thickness of 3 mm. Next, the sample was used as a sample piece for measuring the limiting oxygen index (LOI) for flame retardancy evaluation according to JIS K7201, and the XCI was measured according to the above method. Also, the smoke generation test was obtained as above (LOI value + 0.5)
After determining the minimum light transmittance % based on the method shown in JIS D 1201 based on the oxygen concentration at the point, the maximum light attenuation coefficient (Csmax) was calculated based on the following formula. Csmax=(2.303/L) log(100/Tmin) (In the formula, L is light origin = 0.5m, Tmin is minimum transmittance%
). The results obtained are shown in Table 1. 【table】

Claims (1)

[Claims] 1. Polyvinyl chloride resin and 100 parts of the resin (parts by weight,
(same below) 30 to 80 parts of aluminum hydroxide,
A low-smoke flexible polyvinyl chloride composition comprising 1 to 15 parts of zinc borate, 3 to 30 parts of antimony trioxide, and 20 to 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 CPS or more.