CS225417B1

CS225417B1 - Effective blowing agent component

Info

Publication number: CS225417B1
Application number: CS161382A
Authority: CS
Inventors: Svatopluk ZEMAN
Original assignee: Svatopluk ZEMAN
Priority date: 1982-03-10
Filing date: 1982-03-10
Publication date: 1984-02-13

Abstract

Vynález sa týká použitia dinitrozotetrahydroiipidazo 4,5-d -imidazol-2,5- -/lH,3H/-dionov ako účinnéj zložky nadú vadla, ktorá umožňuje získanie makromolekulárneho alebo příbuzného materiálu s potřebnými charakteristikami ako je hustota, tepelná vodivost, dielektrické ukazovatele, schopnost pohlcovat mechanickú alebo akustickú energiu apod.The invention relates to the use of dinitrosotetrahydroimidazo 4,5-d -imidazole-2,5- -/1H,3H/-diones as an active ingredient in a process that allows obtaining a macromolecular or related material with the necessary characteristics such as density, thermal conductivity, dielectric parameters, ability to absorb mechanical or acoustic energy, etc.

Description

2,223,417

Usually, physically or chemically active blowing agents are used in the production of gas-filled materials. In the case of a physically active blowing agent, the gas is released as a result of the physical process / evaporation, sublimation /, in the case of chemically acting as a result of the chemical process / disruption of the chemical structure or chemical reaction. We divide chemical blowing agents into inorganic and organic. It is generally known that organic blowing agents have better properties than inorganic blowing agents. The most common organic blowing agents are those having two nitrogen atoms linked together, for example azo compounds, hydrazines and N-nitroso compounds. Of the N-nitroso compound superfamily, the most common N, N'-dimethyl-N, N'-dimitroso-terephthalamide and nitrosoalkyleneureas are to be mentioned. This group of blowing agents is qualitatively complementary to the present invention.

According to the present invention, dinitroso-tetrahydroimidazo [4,5-d] imidazole-2,5- (1H, 3H) -dione is used as the active ingredient of the blowing agent. An advantage of the present invention is the fact that the active ingredient of the blowing agent is good dispersible in the blended mixture, into a uniformly porous structure of the gas-filled material. The freely selected proportion of gaseous products diffuses slowly and very diffusely, which ultimately affects the performance of the products.

1,6 and 1,4-Dinitroso-tetrahydroimidazo [4,5-d] imidazole-2,5- (1H, 3H) -dione for the first time in the MS. the MO certificate is thermodynamically unstable substance ©. A sufficient amount of non-toxic gas products (220 ml / g) is obtained from the decomposition.

As is evident from the exemplary part of the present invention, the temperature range of 70 to 150 ° C is the most optimal for the lightening of macromolecular or related materials by the subject matter.

Dinitroso-tetrahydroimidazo [4,5-d] imidazole-2,5- (1K, 3H) -dione may be used as the active ingredient of blowing agent for the manufacture of hollow products and porous materials, sponge and moss.

In the manufacture of hollow rubber articles, the blowing agent, in the form of a table - 3 - 225,417, is inserted into the charge during confection. After loading the charge into the vulcanization form, the active ingredient is decomposed and the released gas presses the material onto the wall of the block. In the production of sponge-like and rubber-like rubber, the blowing agent is mixed into the mixture in a mixer or in a two-cylinder machine. The crude mixtures are processed by the blowing or expansion process. Can blowing agents on this basis also be advantageously used in production? particle board, as it allows to reduce the consumption of glue while maintaining the desired mechanical properties of the final products. Furthermore, in the production of some explosives, especially from the 'Slurry Blasting Agents' (SBA), which do not contain any explosive sensitizer and are sensitized by the released gas and the like.

Applications within the meaning of the present invention have not been described in the literature and are documented by the following examples. Example 1

Up to 100 wt. 4.2 parts by weight of dinitroso-tetrahydroimidazo [4,5-d] imidazole-2,5- (1H, 3H) -dione are added to parts of the adhesive composition / urea-formaldehyde adhesive with hardener and paraffin emulsion. After homogenization, the resulting mixture is dispensed onto chipboard containing 4.1 wt. moisture, in an amount of 12 wt. parts of the mixture to 90 wt. chipboard parts. The resulting mass is formed into a carpet in a known manner, which is pre-pressed at normal temperature and then pressed at 120 ° C for 5 minutes.

By way of comparison, it is in the same manner without the addition of the substances in question to the adhesive composition and using 14 wt. part-glued mixture to 90 wt. chipboard parts, produced a standard particleboard (corresponding to the serial product). For both types of boards, the following parameters are set out in Table 1. - 4 -

225 417

Table no

Parameter Particleboard, lightweight, standard Bending strength / MPa / 18.1 17.6 Strength perpendicular, perpendicular / MPa / 0.5 0.4 Density /kg.m"3/710.0 790.0 Example 2 From technical dinitroso-tetrahydroimidazo [4,5-d] imidazole-2,5- [1H, 3H] -dione produced by MS. and a polypropylene oil having a molecular weight of 560-800 is prepared with a composition of: 97% by weight. dinitrozo-tetrahydroimidazo [4,5- a] imidazole-2,5- (1H, 3H) -dione, 0.5 wt. % water and 2.5 wt. polypropylene oil.

The mixture is free-flowing / non-dusting. The gas number of the mixture is 215 ml.g -1. The prepared mixture does not change its consistency even after storage for 6 months at 18-22 ° C.

The stability of the mixture is judged on the basis of isothermally determined explosion induction periods for a temperature range of 190 to 220 ° C, of which the activation energies of the explosion / E / and the extrapolated explosion induction periods for 100 ° C / Τβ ^ θθ /: - E alone = 30.54 kJ.mol “1Tau100 = 92> 3 8 - mixed with rubber compound components E = 17.72 kj.mol“ 1Tauioo = 38> ° s · - 5 - Example 3 223 417

The effect of the mixture of Example 2 on the rubber composition of the rubber composition is observed in relation to the commercial blowing agent Chempor PC-65 (65% by weight). 1,5-endomethylene-3,7-dinitrole-1,3,5,7-tetraazacycloctane, 20.5 wt. of a methylol-urea-urea complex, respectively. as a standard for the vulcanization temperature of 155 ° C using a "Cone Eheometer" type 100 gauge. The results are shown in Table 2.

Table 2

Blowing agent M / Nm / mm w M / Nm / max 'tbl / e / ty90 / s / A / 8 / Chempor PC-65 6.6 20.0 320 780 230 Example 2 Example 7.6 22.9 335 912 112 where “min υθ ^ max is * bl is tv90 is is the minimum torque maximum torque processing safety optimal vulcanization time start of gas release / decomposition /

The mixture of Example 2 is better mixed into the rubber blend than the Chempor PC-65. After the vulcanization of the white rubber according to Example 2, the white rubber mixture is uniformly light-browned. In the applied pretreatment and processing technology of the rubber mixture (first at 120 ° C and the second at 155 ° C), the blowing agent according to Example 2 is applied. the increase in moldings is slightly smaller than in the case of Chemporu PC-65. This is due to the earlier decomposition of the inventive diluent under the given conditions.

Claims

For the purposes of the invention

Use of dinitroso-tetrahydroimidazo {4,5-a-4-imidazole-2,5 - [1 H, 3 H] -dione as an active ingredient of the blowing agent.