JPH0336855B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a flame-retardant vinyl chloride resin composition. More specifically, the present invention relates to a vinyl chloride resin composition that can be used to produce flame-retardant sheets and the like having low residual properties. BACKGROUND OF THE INVENTION In recent years, there has been a demand for making various synthetic resin materials nonflammable or flame retardant used in materials such as building materials and interior materials, as well as electrical appliances, automobile appliances, and aircraft appliances. Regarding the use of such synthetic resin materials for the above-mentioned purposes, regulations on their use are becoming stricter from the viewpoint of nonflammability or flame retardance. Regarding vinyl chloride resin materials, for example, in consideration of reducing the flame retardant cost of a sheet molded using a flame-retardant vinyl chloride resin composition, that is, economic efficiency, the vinyl chloride resin in the composition is added to the composition. One of the necessary conditions is to blend a large amount of filler (hereinafter referred to as filler), such as 100 to 1000 parts by weight per 100 parts by weight. However, with regard to this type of vinyl chloride resin composition formulation, it has not been possible to obtain a satisfactory flame-retardant composition, and flame tests have shown that the residual time of sheets obtained by molding such compositions is For example, it had the disadvantage of being long, such as 30 seconds or more (note: according to the test method in Article 4-3 of the Fire Service Act Enforcement Order). For example, JP-A No. 49-119934 discloses that flame retardance is achieved by blending less than 100 parts by weight of a filler selected from a metal powder with a specific gravity of 3.0 or more or an oxide of the metal to 100 parts by weight of a vinyl chloride resin. Prescription is disclosed. In this formulation, flame retardancy is maintained in a well-balanced manner by containing less than 100 parts by weight of the filler. However, if the filler is used in excess of 100 parts by weight (hereinafter referred to as PHR) per 100 parts by weight of vinyl chloride resin, molded products such as sheets made using such a composition The residual dust properties are poor. Therefore, the above-mentioned demand for reducing flame retardant costs cannot be met. As a result of intensive research, the present inventors have conducted extensive research aimed at achieving both the use of fillers in flame-retardant formulations and the maintenance of flame-retardant properties (residual dust).
100 to 100 parts by weight of vinyl chloride resin of the filler
It has been surprisingly discovered that by combining a specific flame retardant and a specific Mg compound in combination with a large amount such as 1000 parts by weight, it is possible to achieve the above-mentioned objective of reducing the residual property to 20 seconds or less. We have arrived at the present invention. As is clear from the above, an object of the present invention is to provide a flame-retardant vinyl chloride resin composition that allows a large amount of filler to be blended and has good residual properties in molded products. The present invention includes: a. 100 parts by weight of vinyl chloride resin, b. MgO,
1 of the substances selected from Mg(OH) ₂ or MgCO ₃
10 to 60 parts by weight of seeds or more, c. 3 to 50 parts by weight of a compound consisting of a combination of antimony oxide and halogenated paraffin; One or more fillers selected from metal sulfates 100 to 1000 of the above and e. This is a flame retardant vinyl chloride resin composition containing 45 to 200 parts by weight of a plasticizer. The configuration and effects of the present invention will be explained in detail below. B. Vinyl chloride resin used in the present invention: In addition to homopolymers, copolymers containing 50% by weight or more of vinyl chloride can be used. The copolymer may be a random copolymer, a block copolymer, or a graft copolymer (for example, a copolymer obtained by graft copolymerizing vinyl chloride onto an ethylene vinyl acetate copolymer). Monomers to be copolymerized with vinyl chloride include, but are not limited to, vinyl compounds such as vinylidene chloride and vinyl acetate, acrylic compounds such as acrylic acid, ethyl acrylate, and acrylonitrile, maleic acid, and maleic acid. Mention may be made of maleic acid compounds such as ethyl, vinyl ethers such as methyl vinyl ether and ethyl vinyl ether, and α-olefins such as ethylene and propylene. (b) Mg compounds used in the present invention; MgO, Mg(OH) ₂ and MgCO ₃ are effectively used. Of course, mixtures of these or compounds having intermediate compositions (for example, magnesium hydroxide carbonate) can be used as well. Usage is 10-60PHR, below 10PHR,
The effect is insufficient, and even if it exceeds 60 PHR, the effect does not improve and processability decreases. C Flame retardants and flame retardant aids used in the present invention; Antimony oxides include Sb ₂ O ₃ , Sb ₂ O ₄ ,
Sb ₂ O ₅ or any compound intermediate thereto can be used. As the polyhalogenated paraffin used as a flame retardant aid, both low molecular weight compounds such as dibromodichloropropane and tetrapromethane, and high molecular weight compounds such as chlorinated polyethylene can be used. In addition, chlorentic acid anhydride may also be used. The usage amount of these flame retardants or the combination of flame retardant and flame retardant aid is 3~
50PHR and less than 3PHR are insufficiently effective;
If it exceeds 50 PHR, the processability of the vinyl chloride resin composition will decrease. D. Metal sulfates with a specific gravity of 3.0 or more used in the present invention; Examples of such metal sulfates include calcium sulfate, barium sulfate, etc., and the specific gravity of this metal does not need to be 3.0 or more. These additive materials are so-called extender fillers and can be used in the range of 100 to 1000 PHR. If it is less than 100 PHR, the weight increasing effect will be insufficient, and if it exceeds 1000 PHR, the processability of the vinyl chloride resin composition into molded products and the strength and other physical properties of the molded products obtained by processing will deteriorate, which is not desirable. E. Plasticizer used in the present invention; Any plasticizer that can be used for vinyl chloride resins can be used without restriction. For example, phthalate esters such as dibutyl phthalate, dioctyl phthalate and diisodecyl phthalate, esters of aliphatic dibasic acids such as dioctyl adipate and dioctyl sepacate, epoxy plasticizers such as epoxidized soybean oil, and other polymeric plasticizers are also used. It is possible. Usage amount is 40-200PHR
However, if it is less than 40PHR, the processability will be poor due to the heavy use of filler (2) above.
This is because if it exceeds 200 PHR, the flame retardant effect (low residual dust) due to the mutual effect of the above flame retardant or flame retardant aid and the above 2 Mg compound decreases. F. Other additives used in the present invention: Depending on the purpose of the vinyl chloride resin to be produced, necessary stabilizers, pigments, lubricants, etc. can be added. The amounts used are the same as in the case of ordinary vinyl chloride resin compositions. G. Method for mixing raw materials for the composition of the present invention; Each of the above components I to E is mixed using various mixers, e.g.
Mix uniformly using a kneader, screw type extruder, Banbury mixer, mixing roll, etc. The normal form of vinyl chloride resin compositions is powder (so-called compound) or pellets, so depending on the desired form,
Use a compatible mixer. The conditions for producing the powdered composition of the present invention are, for example, 80 to
140°C for 10 minutes to 1 hour. H. Summary of the effects of the present invention; The vinyl chloride resin composition of the present invention has processability and mechanical strength of molded products equivalent to those of an equivalent vinyl chloride resin composition that is not imparted with flame retardancy. This is because the additive amount ratio of the flame retardant and the compensating agent (MgO, etc.) is small. The vinyl chloride resin composition of the present invention satisfies the prescribed passing criteria in terms of afterflame time, residual dust time, carbonized area, carbonized length, and number of times of flame contact in the tests set forth in Article 4-3 of the Fire Service Act Enforcement Order. On the other hand, a vinyl chloride resin composition that lacks the compatibilizing agent (such as MgO) used in the present invention or contains an insufficient amount of the compatibilizing agent (MgO, etc.) cannot pass the residue time standard. With the vinyl chloride resin composition of the present invention, a large amount of filler can be mixed while maintaining the residual dust within the above-mentioned acceptance criteria, so the weight increasing effect is large and molded products can be produced economically. The present invention will be explained below with reference to Examples and Comparative Examples. Examples 1 to 5, Comparative Examples 1 to 6 Vinyl chloride resin compositions formulated according to Table 1 (Examples) or Table 3 (Comparative Examples) described below were individually mixed at 160°C for 10 min using a Banbury mixer. Knead for a minute, then calender the kneaded product to 160~
A sheet with a thickness of 1 mm was produced at 170°C. This sheet was evaluated for flame retardancy as follows. That is, test pieces cut from the sheets of each example were measured for the following items 1 to 5 using the test method set forth in Article 4-3 of the Fire Service Act Enforcement Example.

[Table] The criteria for passing/failing are defined as the minimum standards in Article 4, 3, Paragraphs 2, 3, and 5 of the Fire Service Act Enforcement Order, and are specifically as described above. The results of Examples 1 to 5 are shown in Table 2, and the results of Comparative Examples 1 to 6 are shown in Table 2.
The results are shown in Table 4.

【table】

【table】

[Table] As shown in the table above, in each example of the present invention in which the amount of residue filler, flame retardant, and flame retardant aid is appropriate, the residue time and other four items passed the above criteria. There is.

【table】

【table】

[Table] As shown in the above tables, when the filler for residue, flame retardant, and flame retardant aid are not included in the formulation, or the amount of the filler is outside the range of the present invention, In all cases, the residual dust time did not meet the above criteria and was rejected.

Claims (1)

[Claims] 1 a. 100 parts by weight of vinyl chloride resin, b.
10 to 60 parts by weight of one or more substances selected from MgO, Mg(OH) ₂ or MgCO ₃ ; c. 3 to 50 parts by weight of a compound consisting of a combination of antimony oxide and halogenated paraffin; 100 to 1000 parts by weight of one or more fillers selected from metal sulfates and e.
A flame retardant vinyl chloride resin composition comprising 45 to 200 parts by weight of a plasticizer.