JPH0159292B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a flame-retardant resin composition comprising polyvinyl chloride mixed with one or more melem or melon. In recent years, the demand for flame retardancy for synthetic resins has been increasing from the standpoint of safety in the event of a fire, and many flame retardants have been proposed for various synthetic resins. As a result of intensive research into flame retardants for polyvinyl chloride, the present inventor has discovered a composition containing one or more of melem and melon represented by the formula () obtained by firing melamine at high temperatures. It was discovered that this material greatly contributes to flame retardation of synthetic resins, leading to the present invention. Regarding the production of melem having the structure of formula (), it can be obtained by baking melamine at 400 to 500°C for several hours, and regarding the production of melon, see the literature by Takimoto et al. (Industrial Chemistry Magazine page 66804 (1963)) However, melamine is 500~
It can be easily obtained by firing at 550°C until no deammonia is observed. According to differential thermal analysis, the decomposition temperature of melem is 500℃
As mentioned above, melon has a temperature of 600°C or higher, and both have extremely high thermal stability as an organic compound. Additionally, both melem and melon have a high nitrogen content of over 60%, making them nonflammable compounds. Conventionally, many flame retardants for polyvinyl chloride have been announced and used. For example, organic flame retardants include halogen compounds, phosphorus compounds, sulfur-containing compounds, amino compounds,
Furthermore, antimony compounds are well known as inorganic flame retardants, but each has advantages and disadvantages. In recent years, the development of highly functional resins has become more active, and they are required to be resistant to higher temperatures, and molding temperatures are accordingly shifting to higher temperatures. Some organic flame retardants decompose at high molding temperatures or in high-temperature surroundings, which can lead to coloration and deterioration of product properties. limits are brought about. Although antimony compounds themselves are stable at high temperatures, they are often used in combination with halogen compounds, so similar problems cannot be avoided. On the other hand, although melem and melon according to the present invention are organic, they are stable up to extremely high temperatures, and do not decompose at all even in high-temperature ambient vaporization and high-temperature molding temperatures. The major characteristics of the melem and melon of the present invention are that they have excellent flame retardant properties and high temperature stability. In addition, the secondary effects of synthetic resins containing melem and melon include electrical properties, especially arc resistance.
One example of this is improved tracking resistance. Common flame retardants have inherent flame retardant effects, but on the other hand, they inevitably suffer from the deterioration of electrical properties as described above. This is thought to be due to the high nitrogen content of melem and melon, but synthetic resins containing melem and melon do not cause a decrease in electrical properties.
In some cases, positive effects can be seen. This is also a feature of the melem and melon of the present invention. In addition to vinyl chloride homopolymer, the polyvinyl chloride resin used in the present invention includes, for example, post-chlorinated vinyl chloride polymer, ethylene-vinyl chloride copolymer, ethylene-vinyl acetate-grafted vinyl chloride copolymer, Examples include ethylene-propylene-grafted vinyl chloride copolymer, chlorinated polyethylene, and chlorinated polyethylene-grafted vinyl chloride copolymer. These polymers may be used alone or in combination of two or more. In addition, plasticizers may be added or not, but when used, plasticizers include alcohols such as 2-ethylhexanol, n-butanol, isodecanol, tridecanol, heptanol, and nonanol, phthalic anhydride, and adipic acid. ,
Esters with carboxylic acids such as azelaic acid and sebacic acid, epoxidized soybean oil, epoxidized fatty acid esters, chlorinated fatty acid esters, tricresyl phosphate, triβ-chloroethyl phosphate, chlorinated paraffin, etc. can give. These plasticizers may be used alone or in combination of two or more. In this case, the blending amount of melon is 1 to 20 parts by weight, preferably 3 to 15 parts by weight, per 100 parts by weight of the resin, and melem and melon may be used alone or in combination. If the amount is less than this, the flame retardant effect will be poor, and if it is more than this, even if the flame retardant effect is present, blooming may occur, which is not preferable. When using this flame retardant, it is very preferable to use it in combination with an antimony-based flame retardant because the flame retardant effect is further improved. Further, conventional additives such as impact agents, stabilizers, lubricants, dyes, and pigments may be added. The invention will now be described in more detail with reference to embodiments. Reference example 1 (Melon production) 400g of melamine was placed in a stainless steel container at a depth of 3
Pour the mixture to a depth of about 1.5 cm and bake at 550℃ for 1.5 hours. The resulting baked product was in the form of a lump, but after pulverizing it, it was washed three times with hot water to separate unreacted materials, and then dried at 150°C to obtain 236 g of pale yellow melon. Ta. This melon is coarsely crushed in a hammer mill and then passed through an air flow crusher to produce particles with a particle size of 5 to 5.
It was ground to 10μ and used as a test sample. Reference example 2 (Manufacture of melem) 200g of melamine was placed in a stainless steel container at a depth of 3
Pour the mixture to a depth of about 1.5 cm and bake at 400℃ for 3 hours.
The obtained baked product was a white powder, which was washed three times with hot water to separate unreacted substances, and then dried at 150° C. to obtain 110 g of melem. This melem was crushed in the same manner as melon and used as a test sample. Example 1 (Blending with polyvinyl chloride resin) Polyvinyl chloride resin (Nippon Zeon 103EP=
1050) 100 parts plus 4 parts of ESO, BP- as a stabilizer
0.5 parts of 58A, 5 parts of TiO ₂ (R), 1.0 parts of LTL-257J,
A mixture of 10 parts of CaCO ₂ and a plasticizer, melem,
Melon was blended and kneaded using heated rolls at 160°C for 4 minutes, and then press-molded into a 1/8 inch thick sheet at 190°C for 4 minutes. Each test was conducted according to Example 1, and the results are listed in Table 1. In addition, the tensile strength is ASTM-D-638, and the flame retardance is
Conforms to UL-94 test method (1/8 inch).

[Table] As is clear from Table 1, the addition of melem and melon shortens the total combustion time and improves flame retardancy. This tendency is remarkable when Sb ₂ O ₃ is used in combination.
In addition, the growth does not decrease significantly even if the amount of melem and melon increases.

Claims (1)

[Claims] A compound having the structure of the primary formula () A flame-retardant resin composition containing one or more types of in a polyvinyl chloride resin.