JPS61205135A - Flame-retardant film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) FIELD OF THE INVENTION The present invention relates to flame retardant films.

(Conventional technology) Conventionally, in order to make flammable films such as resin flame retardant,
Methods of making the film retardant include adding various flame retardants to raw materials such as resins that form the film, or coating the surface of the film with noncombustible or flame retardant materials. The former method has drawbacks such as the physical properties of the resin deteriorate due to the addition of flame retardants, and it cannot be applied to products that are already processed.Also, the latter method also has disadvantages such as the addition of flame retardants, which deteriorates the physical properties of the resin, and that it cannot be applied to products that are already processed. It is difficult to coat a film using this method, and it also has the disadvantage that the surface of the film is hidden by the coating. Therefore, the best way to make a flammable film flame retardant is to coat it with a transparent flame retardant resin. The development of transparent film-forming resins is still insufficient.

(Purpose of Shouting) In view of the above, the present inventors have conducted intensive research and found that a liquid composition containing vinylidene chloride resin, phosphoric acid ester, and brominated epoxy resin as main components is The resinous coating exhibits good flame retardancy due to the synergistic effect with halogen and phosphorus, and also has excellent adhesion and transparency, resulting in the coated flammable film having excellent flame retardancy. The present invention has been achieved based on the discovery that

(Structure of the Invention) The flame retardant film according to the present invention comprises vinylidene chloride resin 1
00 parts by weight, the base film is coated with a flame retardant resin containing 15 to 100 parts by weight of a phosphoric acid ester as a phosphorus content and 15 to 100 parts by weight as a bromine content of a brominated epoxy resin. It is characterized by being

The base film used in the present invention is not particularly limited, but typically includes polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyacrylate, polyester, polyamide, polyimide, polycarbonate, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene , a vinyl chloride copolymer, or a laminate thereof.

The flame-retardant film according to the present invention is obtained by coating one or both sides of a base film as described above with a flame-retardant resin, and the flame-retardant resin used here includes vinylidene chloride, phosphate ester, and Contains brominated epoxy resin as the main component.

As the phosphoric acid ester contained in the flame retardant resin used in the present invention, for example, diethyl phosphate 9. Dimethyl phosphate, tributyl phosphate, trimethyl phosphate, tributyl phosphate, triphenyl phosphate, trioctyl phosphate, tris(
Examples include, but are not limited to, chloroethyl) phosphate and tris(dichloropropyl)phosphate. The content is 15 to 100 parts by weight, preferably 30 to 60 parts by weight, based on 100 parts by weight of the vinylidene chloride resin. Phosphorus content is 1 above
When it is less than 5 parts by weight, sufficient flame retardant effect cannot be obtained.
If the amount exceeds 100 parts by weight, undesirable physical properties such as burning of the film tend to occur.

Further, the brominated epoxy resin contained in the flame retardant resin is not particularly limited, and for example, an epoxy resin polymerized by blending brominated bisphenol A with a bromine content of 18
Those containing ~20% are used. The brominated epoxy resin has a bromine content of 15 to 100 parts by weight, preferably 30 to 100 parts by weight, based on 100 parts by weight of vinylidene chloride resin.
It is contained in the resin in an amount of 60 parts by weight. If the bromine content is less than 15 parts by weight, sufficient flame retardancy cannot be obtained due to the synergistic effect with chlorine and phosphorus, and if it is more than 100 parts by weight, the performance of the flame-retardant resin layer coating formed will deteriorate. It becomes easier.

The flame-retardant resin used in the present invention contains the above-mentioned components, and has good flame retardancy due to the synergistic effect based on the chlorine, phosphorus, and bromine contained therein. Resin, antioxidant, anti-aging agent, lubricant, pigment,
Fillers and the like may be added as appropriate.

Next, a preferred method for producing the flame retardant film of the present invention will be described. A flame-retardant film-forming liquid composition is prepared by dissolving the required amounts of vinylidene chloride resin, phosphoric acid ester, and brominated epoxy resin in an organic solvent such as methyl ethyl ketone or toluene, either alone or in a mixed solvent, and therein, base material fill 7,
After immersing or impregnating the substrate, a flame-retardant resin layer is formed on the base film by drying, thereby obtaining the flame-retardant film of the present invention. Alternatively, the flame-retardant film-forming liquid composition is applied to the surface of a desired combustible film using a gravure coater, a roll coater, a brush, a spray gun, etc.
A flame retardant resin layer may also be formed.

(Effect of the invention) The flame-retardant film of the present invention exhibits excellent flame retardancy due to the synergistic effect of the flame-retardant resin that coats the base film and the chlorine, phosphorus, and bromine contained therein. , since the resin components contained in the flame-retardant resin are vinylidene chloride and epoxy resin, it has good adhesion with the base film,
It also has excellent transparency. Furthermore, as mentioned above, the flame-retardant film of the present invention can be obtained by dipping or impregnating a base film in a liquid composition capable of forming a flame-retardant film, or applying it with a gravure coater, roll coater, spray, etc., and then drying it. It can be obtained with an extremely simple operation.

Furthermore, since the flame-retardant resin used in the present invention exhibits good adhesion to various substances as described above, an already formed flammable film is used as a base film, and its surface is made flame-retardant. It is also possible to coat it with a resin to form a flame-retardant film.

(Example) Examples of the present invention are shown below. In the examples, parts represent parts by weight.

Example 40 parts of vinylidene chloride resin, diethyl phosphate 410
0 parts and 100 parts of a brominated epoxy resin were dissolved in 475 parts of a mixed solvent of equal amounts of methyl ethyl ketone and toluene to prepare a flame-retardant film-forming liquid composition. This composition corresponds to containing 50 parts by weight of phosphorus and 50 parts by weight of bromine based on 100 parts by weight of vinylidene chloride resin.

A flammable vinyl chloride resin film and a polyester resin film were immersed in this liquid composition and a diluted solution of the liquid composition diluted at the dilution ratio shown in Table 1 and dried to obtain sample films. The flame retardancy of each film was determined by igniting the film with a lighter and determining the number of ignitions until ignition and the self-extinguishing property when ignited.

The results are shown in Table 1. The flame retardant film according to the present invention comprises:
Good flame retardancy was exhibited when any of the flammable resins was used as the base film.

Comparative Example 1 40 parts of vinylidene chloride was dissolved in 160 parts of a solvent mixed with equal amounts of methyl ethyl ketone and toluene, and a flammable resin film was immersed in the resin solution and diluted solution in the same manner as in Example 1 and dried. A flame retardant test was conducted on the film.

The results are shown in Table 2. In this comparative example, no flame retardant effect was observed even when an undiluted resin liquid was used.

Comparative Example 2 40 parts of brominated epoxy resin was dissolved in 160 parts of a mixed solvent of equal amounts of methyl ethyl ketone and toluene, and a flammable film was immersed in the resin solution and diluted solution in the same manner as in Example 1.
After drying, the resulting film was subjected to a flame retardant test.

The results showed that only when using undiluted resin solution,
Only some flame retardancy was observed.

Table 1 (Note) AAAA: No ignition even after ignition 7 times. A
AA: It does not ignite even after ignition 6 times, and self-extinguishes after 7 times. AA: It does not ignite even after 5 times, and self-extinguishes after 6 times. A: It won't ignite even after igniting it 4 times. A-B
: Burns after 3 ignitions. B: Burns with two ignitions. C: Burns with one ignition.

Table 2 Comparative Example 3 40 parts of diethyl phosphate was dissolved in 160 parts of a mixed solvent of equal amounts of methyl ethyl ketone and toluene, and a flammable film was immersed in the resin solution and diluted solution and dried. Example 1 A flame retardancy test was conducted in the same manner as above.

Similarly to Comparative Example 2, the flame retardant effect of this comparative product was extremely small compared to that of the present invention product.

Claims (1)

[Claims] (1) A flame-retardant resin containing 15 to 100 parts by weight of a phosphoric acid ester as a phosphorus content and 15 to 100 parts by weight as a bromine content of a brominated epoxy resin, based on 100 parts by weight of vinylidene chloride resin. A flame-retardant film characterized by being formed by covering a base film.