Antifriction pressed wood
The invention relates to the manufacture of composite antifriction materials based on pressure-treated wood and antifriction fillers. The material consists of pressed wood impregnated with a melt of ceresin and animal fat. A specific ratio of components in the material can improve the lubricating properties at low sliding speeds and high specific loads. 3 table.
The invention relates to the manufacture of composite antifriction materials based on pressure-treated wood and antifriction fillers.
A known structure for receiving antifriction materials based on pressure-treated wood that contains mineral oil, HDPE and tar oils and technical fats (USSR Author's certificate No. 1117217, class B 27 k 3/34, 7.10.84. Bull. No. 37).
The disadvantage of antifriction materials based on the composition is a low load capacity due to the use of a liquid modifier, dramatically reducing the physical-mechanical properties of wood.
Closest in composition of the components is the antifriction pressovyh substances (USSR Author's certificate No. 444646, class. B 27 k 3/24, 30.09.74. Bull. No. 36).
The disadvantage of this anti-friction material is that it is designed for friction units operating at higher sliding speeds. At low sliding speeds this material has a high coefficient of friction.
The invention solves the task of creating an anti-friction material having a high anti-friction properties at low sliding speeds and high specific loads.
The solution of the problem is due to the fact that anti-friction pressure-treated wood containing the pressed wood and ceresin, according to the invention additionally contains animal fat in the following ratio, wt. %:
ceresin of 3.75 to 15.0
animal fat 1,25-5,0
pressed wood 80-95
The positive effect of the proposed technical solution is achieved due to the presence of more high-molecular compounds with nonlinear spatial structure of molecules, which increases the load capacity of the material. It should also be noted chemical, and ecological purity of all components in the proposed material.
Antifriction pressed wood produced by prophit the awn 3-5%, under the pressure of 3 MPa, with full immersion in the molten mixture of ceresin and animal fat (GOST 1045-73). While holding the workpiece under pressure 5-10 minutes After impregnation of the preform is cooled and processed to the desired dimensions.
In table.1 shows the compositions of antifriction materials with different content components.
Received antifriction materials were tested for friction paired with the shaft of the Article. 45 Re=45-50 when the specific load of 30 MPa, sliding velocity of 0.015 m/s and roughness of the shaft is 1.25...1 micron.
The values of the coefficients of friction and wear depending on the contents of the components are given in table 2.
As can be seen from the table. 2, is optimal anti-friction material with the content of ceresin 3.75 to 15.0% and technical fat of 1.25 to 5.0% by weight, since the anti-friction material according to example 2 does not work reliably and spontaneously disintegrates. The materials according to example 4 and 10 have an increased coefficient of friction. The material from example 8 is not economically feasible because it gives too little advantage in comparison with the material 7. The material according to example 3, despite the high wear, can be recommended at reduced loads, since it has the lowest CoE is I 0.1 m/s Coefficients of friction values for different formulations are given in table. 3.
As follows from comparison of tables 2 and 3, with increasing sliding velocity, the positive effect of technical fat is stored. Thus, this anti-friction material is operable in a wide range of sliding speeds.
Antifriction pressed wood, including pressed wood and ceresin, characterized in that it additionally contains animal fat in the following ratio, wt.%:
Ceresin of 3.75 to 15.0
Animal fat 1,25-5,0
Pressed wood 80-95
FIELD: petroleum products and antiseptic materials.
SUBSTANCE: invention is directed to protection against damage caused by fungi and bacteria, in particular to impregnation of wooden crossties and rods. Antiseptic of invention contains, as long fraction of thermal cracking, fraction of heavy pyrolysis tar boiling off within a range of 200°C to end boiling point in amount 70-95 wt % and, as color regulator, mazut fraction boiling off within a range of 220°C to end boiling point in amount 5-30 wt %.
EFFECT: expanded reserve of oily wood-impregnation antiseptics and improved color thereof thanks to optimal proportions of distillate and residual petroleum fractions.