RU2445323C1 - Antifriction polymer composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition contains low-pressure polyethylene and bis-[2-(2-oxo-3,5-di-tert-butylphenyl-amino)-4,6-di-tert-butyl-cyclohexa-3,5-dienon]Al(III) as an additive. The disclosed composition has low coefficient of friction and high heat resistance and hardness.

EFFECT: improved antifriction properties of the composition prolong the service life of articles made from said material.

2 tbl

Description

The invention relates to composite materials that can be used as structural materials in mechanical engineering, aircraft, instrument making.

A known composition based on polyethylene, intended for the manufacture of molded products, containing at least 94.5 wt.% Polyethylene, 0.05-0.5 wt.% Amide saturated fatty acids, 0-0.15 wt.% Auxiliary lubricant, 0-5 wt.% one or more additives selected among antioxidants, dyes, anti-UV, antistatic agents (US Pat. 2267504 dated 03.15.2001, C08L 23/04).

The disadvantage of this composition is the low antifriction characteristics, which limits their scope.

The closest (prototype) in technical essence to the proposed invention is a composite thermoplastic material (US Pat. 2283325 from 2004, C08L 23/02). Composite material based on low-pressure polyethylene (HDPE) contains heat-treated silicate and a halogen-containing oligomer as additives.

However, the products obtained from this composition have increased stiffness and have insufficiently high antifriction characteristics.

The authors were faced with the task of improving the antifriction characteristics of products from the developed polymer composition.

This object is achieved by introducing bis- [2- (2-oxo-3,5-di-tert-butylphenylimino) -4,6-di-tert-butyl cyclohexa-3,5 into the low-pressure polyethylene (HDPE) as an additive -dienone] Al (III) in the following ratio of components by weight:

Low Pressure Polyethylene (HDPE) 96-99 Bis- [2- (2-oxo-3,5-di-tert-butylphenylimino) -4,6-di-tert-butyl-cyclohexa-3,5-dienone] Al (III) 1-4

An example of obtaining additives

To a solution of 2.66 g (12 mol) of 3,5-di-tert-butyl-1,2-dihydroxybenzene in 60 ml of ethanol was added with stirring a solution of 0.72 g (3 mmol) of aluminum chloride (III) hexahydrate (AlCl3 · 6H2O) in 30 ml ethanol. After adding 5 ml of a 25% aqueous solution of ammonia (NH4OH), the solution was shaken (or sparged with air) for 5 hours. The precipitate formed was filtered off and washed with 10 ml of water and then with 10 ml of ethanol. The precipitate was crystallized from chloroform. Dark green crystals, T pl. 240 ° C. Molar mass of 872.06. (C. Camacho-Camacho, G. Merino, F.J. Martinez-Martinez, H. Nöth, R. Contras // Eur. J. Inorg. Chem. 1999. P.1021-1027).

Bis- [2- (2-oxo-3,5-di-tert-butylphenylimino) -4,6-di-tert-butyl-cyclohexa-3,5-dienone] Al (III) is a chelate complex with Al ion ³⁺ , to which two ligands are coordinated: anion and dianionradical (µ _eff . 1.75 M.B.).

The compositions of the developed compositions are shown in table 1.

Table 1 The compositions Composition Content, wt.% one 2 3 four 5 (prototype) Low Pressure Polyethylene (HDPE) one hundred 99 98 96 94.5

Continuation of table 1 bis- [2- (2-oxo-3,5-di-tert-butylphenylimino) -4,6-di-tert-butyl-cyclohexa-3,5-dienone] Al (III) - one 2 four - Halogenated oligomer - - - - 5 Heat treated silicate - - - - 0.5

An example of obtaining the developed anti-friction composition.

The work used low-pressure polyethylene (HDPE) GOST 16338-85.

The proposed additive bis- [2- (2-oxo-3,5-di-tert-butylphenylimino) -4,6-di-tert-butyl-cyclohexa-3,5-dienone] Al (III) is dissolved in benzene. Then the powder of low pressure polyethylene (HDPE) is loaded into the mixer, the resulting solution is thoroughly mixed for 10 minutes. The resulting mixture is dried in an oven at a temperature of 95-100 ° C and products are pressed from the resulting mixture in the following mode: pressing temperature 130 ° C, pressure 2.5 MPa, kept under pressure for 10 minutes.

The products obtained from the developed compositions are subjected to a set of physical and mechanical studies, the main of which are the coefficient of friction, heat resistance, and hardness. The test results are presented in table 2.

table 2 Product Properties Songs Prototype one 2 3 four Hardness kg / mm ² 7.4 6.3 6.3 5.8 7.0 Coefficient of friction 0.12 0.09 0.08 0.08 0.12 Weight wear, g / 7 hours of work 0.0055 0.0030 0.0035 0.0035 0.005 Heat resistance according to Vika, ° С 125 135 138 140 -

Thus, the use of the proposed antifriction polymer composition helps to reduce the coefficient of friction, increase heat resistance and increase the service life of products.

The surface of the products obtained from the proposed composition, has a more dense structure, and after testing on a friction machine on the surface of the product there are no traces of friction.

Claims (1)

Antifriction polymer composition containing low pressure polyethylene (HDPE) and an additive, characterized in that as an additive it contains bis- [2- (2-oxo-3,5-di-tert-butylphenylimino) -4,6-di-tert -butyl-cyclohexa-3,5-dienone] Al (III), in the following ratio, wt.h:
Low Pressure Polyethylene (HDPE) 96-99 Bis- [2- (2-oxo-3,5-di-tert-butylphenylimino) -4,6-di-tert-butyl-cyclohexa-3,5-dienone] Al (III) 1-4.