JPS61204252A - Liquid composition forming flame-retardant coating film - Google Patents

Abstract

PURPOSE:To obtain the titled composition capable of forming a coating film having excellent flame-retardance, transparency and adhesivity when dried after the application to a combustible substance, by dissolving a solid composition containing a vinylidene chloride resin, a phosphoric acid ester and a brominated epoxy resin in a solvent. CONSTITUTION:(A) 100pts.wt. of a vinylidene chloride resin is compounded with (B) 15-100pts., preferably 30-60pts. (in terms of phosphorus) of a phosphoric acid ester (e.g. diethyl phosphate, dimethyl phosphate, etc.) and (C) a brominated epoxy resin (e.g. an epoxy resin obtained by the polymerization of monomers containing brominated bisphenol A and having a bromine content of 18-20%) in an amount to give a solid composition having a bromine content of 15-100pts., preferably 30-60pts. based on 100pts. of the component A. The obtained solid composition is dissolved in a solvent (e.g. methyl ethyl ketone, toluene, etc.).

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a flame-retardant film-forming liquid composition, for example:
The present invention relates to a flame-retardant film-forming liquid composition that easily forms a flame-retardant film on the surface of a synthetic resin film, paper, cloth, etc. by applying it or dipping it and drying it.

(Prior Art) As one of the methods of making combustible substances flame retardant, there has been known a method of covering or coating a combustible substance with a non-flammable or flame-retardant substance to make it non-flammable or flame-retardant. The non-combustible or flame-retardant materials used in this case include steel plates,
Examples include metals such as aluminum, inorganic substances such as asbestos, calcium silicate, and gypsum, and flame-retardant resins. However, it is difficult to coat relatively thin films or sheets made of paper, cloth, flammable resin, etc. with metal or inorganic materials, and because the surface is hidden, they are generally difficult to coat with these flammable materials. Flammable resin is used. However, the development of a film-forming resin that easily and effectively imparts flame retardance and is substantially transparent has not yet been achieved.

(Objective of the Invention) 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 has a resinous property after evaporation of the solvent. The present invention was achieved by forming a film, and finding that the resin film exhibits good flame retardancy due to the synergistic effect with halogen and phosphorus, and also has excellent adhesiveness and transparency.

(Structure of the Invention) The flame-retardant film-forming liquid composition according to the present invention has a phosphorus content of 15 to 100 parts by weight based on 100 parts by weight of vinylidene chloride resin, and a bromine-containing brominated epoxy resin. It is characterized by being formed by dissolving a solid composition containing 15 to 100 parts by weight in a solvent.

Phosphate esters used in the present invention include, for example, diethyl phosphate, dimethyl phosphate, triethyl phosphate, trimethyl phosphate, tributyl phosphate, triphenyl phosphate, trioctyl phosphate, tris(chloroethyl) phosphate,
Examples include, but are not limited to, tris(dichloropropyl) phosphate and the like. The content of the phosphoric acid ester is blended so that the phosphorus 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. When the phosphorus content is less than the above 15 parts by weight, a sufficient flame retardant effect is obtained, while when it exceeds 100 parts by weight, undesirable physical properties such as burning of the coating tend to occur.

In addition to chloride, vinylidene resin, and the above-mentioned phosphoric acid ester, the flame-retardant film-forming liquid composition of the present invention further contains:
A brominated epoxy resin is blended, and the synergistic effect based on chlorine, phosphorus and bromine provides good flame retardancy. The brominated epoxy resin used is not particularly limited,
For example, an epoxy resin prepared by blending and polymerizing brominated bisphenol A and containing 18 to 20% bromine is used. Brominated epoxy resin contains bromine as
15 to 10 parts by weight of vinylidene chloride resin
It is blended in an amount of 0 parts by weight, preferably 30 to 60 parts by weight. If the bromine content is less than 15 parts by weight, sufficient flame retardancy due to the synergistic effect with chlorine and phosphorus cannot be obtained,
Moreover, if the amount is more than 100 parts by weight, the performance of the formed film tends to deteriorate.

As described above, the flame-retardant film-forming liquid composition of the present invention contains a phosphoric acid ester, a brominated epoxy resin, and vinylidene chloride, and further contains a desired resin, an antioxidant, an anti-aging agent, a lubricant, Pigments, fillers, etc. may be added as appropriate.

In order to form a flame-retardant film on the surface of a flammable substance using the flame-retardant film-forming liquid composition of the present invention, the required amounts of vinylidene chloride resin, phosphoric acid ester, and brominated epoxy resin are mixed with methyl ethyl ketone, toluene, etc. A desired flammable substance, such as paper, cloth, flammable resin, etc., is immersed or impregnated in a flame-retardant film-forming liquid composition prepared by dissolving it in an organic solvent alone or in a mixed solvent, and then dried. It can be obtained by Alternatively, the flame-retardant film-forming liquid composition may be applied to a desired surface using a gravure coater, a roll coater, a brush, a spray gun, or the like.

(Effects of the Invention) As described above, the flame-retardant film-forming liquid composition of the present invention forms a film with excellent flame retardancy due to the synergistic effect of chlorine, phosphorus, and bromine, and the resin components used Since it is vinylidene chloride and an epoxy resin, it has excellent transparency and adhesive properties, and is ideal as a flame-retardant film-forming agent that imparts flame retardancy to paper, cloth, flammable resin sheets, etc. Furthermore, as mentioned above, in order to form a flame-retardant film on the surface of a combustible substance using the flame-retardant film-forming liquid composition of the present invention,
All that is required is to immerse or impregnate a flammable substance in the resin liquid of the present invention, or apply it with a gravure coater, roll coater, spray, etc., and dry it, and impart flame retardancy to a flammable substance with an extremely simple operation. can.

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

Example 40 parts of vinylidene chloride resin, 10 parts of diethyl phosphate
A flame-retardant film-forming liquid composition of the present invention was prepared by dissolving 0 parts of brominated epoxy resin and 100 parts of brominated epoxy resin in 475 parts of a mixed solvent of equal amounts of methyl ethyl ketone and toluene. 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.

The flammable substances shown in Table 1 are immersed in this liquid composition and a diluted solution of the liquid composition diluted at the dilution ratio shown in Table 1, dried, and then ignited with a lighter until ignition occurs. Flame retardancy was determined based on the number of ignitions and self-extinguishing ability when ignited. The results are shown in Table 1.

The combustible material on which a flame-retardant film was formed using the flame-retardant film-forming liquid composition of the present invention had good flame retardancy in all of paper, cloth, and resin sheets.

Comparative Example 1 40 parts of vinylidene chloride was dissolved in 160 parts of a solvent made by mixing equal amounts of methyl ethyl ketone and toluene, and a combustible material was immersed in the resulting resin liquid and its diluted liquid in the same manner as in the example, dried, and then A flammability test was conducted. The results are shown in Table 2.

In this comparative product, some flame retardancy was observed in some paper and cloth, but there was no effect at all on the resin sheet.

Table 1 (Note) AAAA: No ignition even after ignition 7 times. A
A/: 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-81 ignitions to burn. B: Burns with two ignitions. C: Burns with one ignition.

Table 2 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 combustible substance was immersed in the resulting resin solution and its diluted solution in the same manner as in the example and dried. After that, a flame retardancy test was conducted. The results are Comparative Example 1
It was almost the same as in the case of , and only a slight flame retardance was observed.

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 substance was immersed in the resulting solution and its diluted solution and dried. I conducted a test. Similarly to Comparative Examples 1 and 2, the flame retardant effect of this comparative product was extremely small compared to the product of the present invention.

Claims (1)

[Claims] (1) A solid composition 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 is dissolved in a solvent based on 100 parts by weight of vinylidene chloride resin. A flame-retardant film-forming liquid composition characterized by: