SU823404A1 - Composition for making writing leads - Google Patents

Description

 G

The invention relates to the manufacture of writing materials and can be used to make writing rods intended for applying black marks on the light smooth surface of various materials.

A writing rod l is known, which is currently used for writing text on a dark smooth surface, which contains in its composition, weight, h:

Gypsum (binder) 100.0

0.01 - 0.5

Dye. .

Polyacrylamide

0.001 - 0.5

(coagulum) 80 - 200

Water

However, the resulting crayon stains my hands, crumbling, is poorly erased from the surface of g6ki.

A known composition for drawing rods is G2, which contains components in the following ratios, parts by weight:

Emulsion polystyrene 60-75 Bitumen 8 - 2b Soot gas 17-21 However, the production of this compound for rods is difficult to manufacture, requires large energy costs, and the equipment performance is low, since only the process of grinding the mixture components lasts up to 10 hours. writing black text only on paper. The adhesion with the surface of other materials, such as glass, metal, painted wood, is low, so it is not applicable to writing letters on these materials.

Claims (2)

The closest to the technical essence of the present invention is a composition for the manufacture of writing rods, including epoxy resin, natural or synthetic rubber, dye (graphite, carbon black) filler. When the rod is stretched, the raw billet is passed through the GB fatty bath. However, in the manufacture of writing rods by a known method, mixing chrome requires operations such as pressing, second mixing, drawing the rod, temperature treatment, impregnation, and inserting the rod into the wooden casing, using such thin components as epoxy resin, rubbers , - platinum gutapercha, clever pol1. Inichloride, beeswax, stearin, and additionally wooden or plastic shells. In addition, the known composition does not allow to use the obtained writing rods to apply black marks on the light smooth surface of various materials. The purpose of the invention is to simplify the technology and the possibility of applying black marks on the light smooth surface of various materials. The goal is achieved by the fact that the composition for the manufacture of writing rods, including synthetic rubber and carbon black, contains the quality of synthetic rubber, butadiene, a styrene block copolymer with a bound styrene content of 12-43 wt.% As carbon black lamp soot with a specific geome: Tricarous surface 12-1-8 additionally mineral oil in the following ratio of components, wt.%: Butadiene-styrene block copolymer with a content of bound styrene 12-43 wt.% 43-60 Soot lampov 28-43 Mineral oil 6-19 As mineral oil the composition uses, for example, Vaseline oil GOST 1; 840-51), avtole oil (PC-15 GOST 1862-63). Example 1. Mix components, wt .: Butadiene-ethyrol block copolymer with bound styrene content of 12 wt.% Soot Larki PM-15 Vaseline oil 4 As a result of mixing and syringe, soft writing rods are obtained. Example 2. Compotes, wt.%, Interfere: Butadiene-ethiol block copolymer with co-condensation of bound styrene 30 wt.% 50 Soot of PM-15 brand 38 Vaseline oil 12 The writing rods are medium hard. Example 3. Mixed compotes, wt.%: Butadiene-ethiol block-copolyer with a bound styrene content of 43 wt.% 60 Soot of PM-15 brand 34 Vaseline oil 6 Solid writing rods are obtained. The components are mixed on the faces for 30 minutes during the next sequence by mixing time. Name of the Inmin Ingredients Butadiene-styrene Block copolymer 1/3 carbon black 1/3 carbon black Mineral oil.18 1/3 carbon black 22 PR M me R 4 The components are mixed.%: Butadiene-etirol block copolymer with a bound styrene content of 30% by weight 43 Soot of grade S-1538 AA-15 oil (autol oil 18) 19 Used in this composition Samarka PM-15 is a soot with a specific surface geometry of 12-18 m / g. The mass obtained after mixing is cast on the rollers with surface killings corresponding to the dimensions. rods, or simulate on a syringe machine, followed by cutting to size. Thus obtained blanks can have different lengths and mu and, when painted on the surface, leave a mark in the form of a black film, which, having sufficient adhesion to hold different materials on the smooth surface, is at the same time quite easily removed by erasing. The resulting writing rods have the following properties: Tensile strength at GOST 270-64, MPa 0.75-10.6 Hardness according to TM-2 according to GOST 263-53, standard units 70-90 The color of the line is black, the intensity depends on the degree of pressure on the rod. The resulting writing rods can be used to apply black signs on the brighter smooth surface of various materials (wood, glass, metal, plastic, plastic). Thus, it is possible to write black signs on the light smooth surface of various materials, and the perception of written signs does not tire the eyes, which is especially important for the school educational process. In this case, not only pure ingredients can be used, but also waste from the rubber industry, which significantly reduces the cost of mass production of writing rods. The invention The composition for the manufacture of writing rods, including synthetic rubber and carbon black, characterized in that, in order to simplify the technology and the possibility of applying black marks on the light smooth surface of various materials, it contains as a synthetic rubber a butadiene-washing block copolymer with a content of bound styrene of 12-43 wt.%, as a blackened carbon black with a specific geometric surface of 12-18 m / g, and additionally mineral oil in the following ratio of components, wt.%: an en-styrene block copolymer with a content of 12-43 wt.L of styrene bound. Soot Lampova Mineral oil. Sources of information taken into account during the examination 1. USSR author's certificate No. 418510; cl. From 09 to 13/00, 1971. 2. USSR author's certificate number 342878, cl. From 09 D 13/00, 1970. 3i Copyright Certificate of Czechoslovakia 153761, cl. 22 o 2/01, 1974 (proto