SU531828A1 - Polymer Press Position - Google Patents

Description

The invention relates to the field of production of pressing materials, widely used for the manufacture of products for technical and domestic purposes, such as parts of an automobile braking system, and can be used in the manufacture of phenolic compositions by the roller or auger method.

A known composition for press materials used for the manufacture of technical and household products, containing (by weight) 42.8 novolac phenol-formaldehyde resin, 43.6 wood flour, 6.5 hexamine, 4.4 mummies, 0.9 lime, 1.8 targeted supplements.

A known composition for a press material containing phenolic resin, wood flour, lime, and targeted additives.

The closest prototype is a composition for press materials, which has an increased screwing speed and includes (weight by weight) 40-45 phenol-aldehyde novolac resin, 40-45 wood flour, 7-8 mixtures of hexamine with burnt lime.

However, these compositions do not possess the necessary physicomechanical properties and are not capable of being processed by compression.

The aim of the invention is to improve the physicomechanical properties of the press material and to impart its ability to be processed by press molding.

This goal is achieved by those. that the pitch containing phenol-formaldehyde; about resin, wood flour, s. the mixture of urotropine with quicklime, additionally contains phthaline-containing compounds with a ratio of urotropine, quickened lime and naphthalene or derivatives based on it, respectively 6.1-6.5: 0.9- 0.95: 4-3 and kaolin in the following ratio of components, weight. h .: aldehyde phenol forms

resin

Wood Muka Mix of hexamine, quicklime, naphthalene or derivatives based on it9-12 Kaolin4-5

Phthalic acid, phenolphthalein can be used as naphthal-based derivatives.

The composition contains targeted additives such as nigrosine, stearin and water.

A composition for press materials is prepared as follows.

Claims (3)

Pre get a mixture of hexamine, quicklime. naphthal) 1a or derivatives on its HVTCM six joint vibratory comminution and mixing. Then, the resulting curing mixture and the remaining ingredients of the composition are mixed. The mixture is rolled or processed by augers. At the same time, under conditions of elevated temperatures and pressures, in the presence of residual catalyst in the resin of the residual catalyst, the products of further interaction of naphthalene and formaldehyde, released during the decomposition of urotropine, are formed, contributing to further deepening of the phenol-formaldehyde resin condensation. The rolled mass is ground to a powder that is standardized. The resulting press material is processed into a product by pressing. Example 1. A pre-cured mixture of 6.5 wt. including hexamine, containing 3; 3.5; 4 wt. including naphthalene, 0.9 weight. including negasino lime, by their joint grinding in a vibration mill to a particle size of 80 microns or less. The resulting curing complex is added to the press composition in accordance with the following formulation, wt. hours: Phenol-formaldehyde resin 42, 8 Mixture of urotropine, naphthalene and lime 10.4 Wood flour 43.2 Kaolin 4.4 Nigrosine 1.5 Stearin 0.7 Water 0.3 The resulting composition is rolled on a friction roller at a working roll temperature of 70-100 ° С and idle roll 125-145 ° С. The rolled material is cooled, crushed and crushed. The finished press material is standardized and further processed by the method of press molding according to the following mode: Time and preliminary heating of the tablets in the HDTV generator, c60-80 Anode current, A0.6-0.8 Temperature of the forming parts of the mold, ° С165- 175 Specific pressure, kgf / cm 200-250 Excerpt in the press for 1 mm of the thickness of the product, s40-50 Example 2. Pre-prepared curing mixture containing (wt. H.) 7.3 hexamine, 0.9 lime and 3.5 phthalic acid. Then the press material is prepared according to the recipe, weight. hours: 65 Phenol-formaldehyde resin Resin Curing complex of hexamine, lime and phthalic acid Wood flour Kaolin Pigrosin Stearin The mixture is then processed in the following manner. Example 1 3. Pre-heating m-curing mixture containing (parts by weight), 1 hexamine, 0.9 quick extract and 4.0 enolphthalein. Recipe composition of the press material, the EU. including: Phenol-formaldehyde resin 40, 7 Curing complex of hexamine, lime and phenolphthalein 11.0 Wood flour 45,0 Pigrosin 1.5 Kaolin 5,0 Stearin 0,8 Water 2,5 The mixture is processed in the following way 1. Experimental key figures batches are given in tabitsa. Press material Indicator of examples 1-3 Not more than 1.36-1.38 lot size, g / cm3 Not less than 7-9 arn-viscosity, kgssm / cm 900-1250 disruptive bending stress, kgf / cm 136-145 strength according to Martens, No more than 30–40 doping, mg 60–70 extracts, s 170–190 cumulative, mm astrometric characteristics: cure time at, with a duration of 400–420 plastic-viscous state at 120 ° C, s The resulting press material has improved physicomechanical and technological properties, which makes it possible to use it for the manufacture of products of complex configuration. Claim 1. Polymer press composition containing phenol-formaldehyde resin, wood flour, hardener, mixture of hexamine with quicklime, as described in the following :. that, in order to improve the physicomechanical properties of the press material and to give the material the ability to be processed by press molding, the press composition contains as a hardener a mixture of hexamine, quicklime and naphthalene or derivatives based on it in the following ratio of 6.1-6, respectively, 5: 0.9-0.95: 3-4 and additionally contains kaolin with the following ratio of components, weight. h: Phenol aldehyde forms resin40-45 Wood flour40-45 A mixture of hexamine, quicklime and naphthalene or derivatives based on it9-12 Kaolin 4-5 2. Polymer press composition according to claim 1, distinguished with that. phthalic acid and phenolphthalein are used as naphthalene derivatives.