RU2069673C1 - Antifriction composition for treatment of solid surfaces - Google Patents

Abstract

FIELD: production of antifriction compositions. SUBSTANCE: proposed composition contains solvent and perfluorinated compound of polyalkylene oxide (its quantity being 0.01-5.0 mass %). Perfluoropolyoxyalkylene carboxylic acids and/or sulfoacids and/or mixture thereof with perfluoropolyoxyalkylene ketones having formula which is given in specification are used as mentioned above perfluorinated compound. EFFECT: improved quality. 3 cl, 1 tbl

Description

 The invention relates to compositions used for processing hard surfaces to reduce the coefficient of friction and increase wear resistance, which allows you to adjust the wetting, adhesion, adhesion and surface catalytic activity of contact surfaces made of metal, ceramics, stones and polymeric materials.

 In the operation of friction units and tools for processing various solid materials, their wear resistance, friction coefficient and reliability are of primary importance. To improve performance properties, various coatings are used for contact surfaces.

Known coating based on polyacrylamide or a copolymer of acrylamide with formaldehyde with the addition of graphite [1]
However, this coating tends to peel and changes the geometric dimensions of the contact surfaces. Such a coating can be used only at low specific loads and moderate temperature.

The closest is the composition for treating hard surfaces, consisting of a 0.01-5.0% solution of perfluorinated acid polypropylene oxide of the formula C ₃ F ₇ O (C ₃ F ₆ O) _n COOH, where n 8-30, in a mixture of freons 112 and 113 [2]
However, such a composition can only be used at a temperature of not more than 150 ^o C, which is determined by the presence of formate groups of UNOCH, which are easily decomposed with the formation of CO ₂ , R _F H and R _F COF, which causes corrosion of metals.

 The aim of the invention is the creation of an antifriction composition having increased thermal stability and allows to reduce the coefficient of friction, the moment of rest friction, to increase wear resistance and extreme pressure properties.

где R_F= 1) CF₃O-, 2) С₂F₅О-, 3) С₃F₇О-, 4) С₈F₁₇О-,

n 8-50, m 0-10, k 0-1
II)-(CF₂CF₂O)_n(CF₂O)_mCF₂-
n 5-200, m 0-30
III)-(СF₂CF₂CF₂O)_n CF₂CF₂-
n 8-50
IY)-(CH₂CF₂CF₂O)_nCH₂CF₂-
n 5-40
Z CО -, SO₂ -
Q OH, -СF₃, -СF (CF₃)₂
в количестве 0,01-5,0 мас.This is achieved in that the antifriction composition comprising a solvent and a perfluorinated polyalkylene oxide compound contains perfluoropolyoxyalkylene carboxylic or sulfonic acids as a perfluorinated polyacylene oxide compound or a mixture thereof with perfluoropolyoxyalkylene ketones of the general formula

where R _F = 1) CF ₃ O-, 2) C ₂ F ₅ O-, 3) C ₃ F ₇ O-, 4) C ₈ F ₁₇ O-,

n 8-50, m 0-10, k 0-1
II) - (CF ₂ CF ₂ O) _n (CF ₂ O) _m CF ₂ -
n 5-200, m 0-30
III) - (CF ₂ CF ₂ CF ₂ O) _n CF ₂ CF ₂ -
n 8-50
IY) - (CH ₂ CF ₂ CF ₂ O) _n CH ₂ CF ₂ -
n 5-40
Z CO -, SO ₂ -
Q OH, -CF ₃ , -CF (CF ₃ ) ₂
in an amount of 0.01-5.0 wt.

As a solvent, substances are used in which compounds based on perfluoropolyalkylene oxide are soluble. Such substances are trifluorotrichloroethane, perfluoropentane, compounds from the range of polyfluoroalkanes or polyfluorohydroalkanes with the number of carbon atoms 5-10, as well as water mixed with an emulsifier taken in an amount of 0.01-5.0 wt. As an emulsifier, fluorine-containing cationic or neonogenic or ampholytic emulsifiers can be used. For example, N ₁ N demethyl N ethylol propane amide perfluoro-enantic or pelargonic acid, polyethylene glycol perfluoro-heptanoyl with the number of ethylene oxide units equal to 7-25; N ₁ N - demethyl N methylene carboxy propanamide perfluoro-enanth, pelargonium or 3,6 dioxa 5 trifluoromethyl perfluorononyl sulfonic acid.

 The perfluoropolyoxyalkylene compounds used according to the invention are the product of a copolymerisation of hexafluoropropylene or tetrafluoroethylene with oxygen in the field of ionizing radiation or in the chemical initiation of the copolymerization reaction with elemental fluorine.

These compounds are obtained by anionic polymerization of hexafluoropropylene oxide or tetrafluoroethylene [3] or oxetane obtained by dimerization of tetrafluoroethylene and formaldehyde, followed by anionic polymerization and the exchange of hydrogen atoms to fluorine or without exchange [4]
Oligomers are hydrolyzed, followed by the isolation of acids or ketones by known techniques. Perfluoropolyokialkylene fluoride can also be obtained by copolymerization of, for example, hexafluoropropylene with oxygen in a UV radiation field at (-30) (-60) ^o C in the liquid phase. Sulfonic acids are obtained by anionic condensation of tetrafluorosulfone with hexafluoropropylene oxide at -10 ^° C, followed by isolation of the target product and elimination of the fluorohydride group by fluorolysis at 120 ^° C.

. Вследствие этого снижается поверхностная энергия с 1800-5000 mH/м (для металлов) до 4-6 mH/м и с 500 mН/м (для керамики, камня) до 2-4 mH/м, момент трения покоя уменьшается в 10-10^-4 раз, повышается тангенциальное усилие сдвига минерального масла на твердой поверхности с 0,5-0,7 до 15-30 g. Полученное таким образом покрытие выдерживает удельные нагрузки до 300 кГ/мм нетоксично, негорюче (температуре начала разложения ≥450^oС), пожаро-взрывобезопасно и нерастворимо в углеводородных растворителях, коэффициент трения поверхностей при этом снижается более чем в 10 раз, износ в 13-15 раз, в результате за счет снижения потерь мощности на трение контактных поверхностей энергопотребление уменьшается на 15-20%
Предлагаемая композиция также не требует возобновления и может быть использована для обработки металлообрабатывающего инструмента (резанием, давлением), пресс-инструмента, узлов трения машин и механизмов, работающих в условиях смазки или без таковой. Состав может быть использован в медицине для обработки хирургических спиц и шурупов при лечении опорно-двигательного аппарата, так как обладает бактерицидным, бактериостатическим и антиадгезионным действием.The composition deposited on a solid surface is adsorbed, then chemisorbed and forms a monomolecular layer on the surface with a thickness

. As a result, the surface energy decreases from 1800-5000 mH / m (for metals) to 4-6 mH / m and from 500 mN / m (for ceramics, stone) to 2-4 mH / m, the resting friction moment decreases by 10- 10 ^-4 times, the tangential shear force of mineral oil on a solid surface increases from 0.5-0.7 to 15-30 g. The coating thus obtained can withstand specific loads of up to 300 kg / mm non-toxic, non-combustible (decomposition onset temperature ≥450 ^o С), fireproof and insoluble in hydrocarbon solvents, while the friction coefficient of surfaces decreases by more than 10 times, wear by 13- 15 times, as a result of reducing power loss due to friction of contact surfaces, energy consumption is reduced by 15-20%
The proposed composition also does not require renewal and can be used for processing a metalworking tool (cutting, pressure), a press tool, friction units of machines and mechanisms operating in or without lubrication. The composition can be used in medicine for the treatment of surgical knitting needles and screws in the treatment of the musculoskeletal system, as it has a bactericidal, bacteriostatic and anti-adhesive effect.

Contact surfaces treated with the proposed composition do not change their properties at 400 ^o C for at least 8 months.

 The compositions and properties of the coatings are shown in the table.

Claims (3)

1. An antifriction composition for treating hard surfaces, comprising a solvent and a perfluorinated polyalkylene oxide compound, characterized in that it contains perfluoropolyoxyalkylene carboxylic and / or sulfonic acids and / or mixtures thereof with perfluoropolyoxyalkylene ketones of the general formula as perfluorinated polyalkylene oxide compound
R _F R $\genfrac{}{}{0ex}{}{\text{1}}{\text{F}}$ ZQ,
where R _F CF ₃ O-, C ₂ F ₅ O-, C ₃ F ₇ O-, C ₈ F ₁₇ O-;

n 8 50, m 0 10, k 0 1;

n 5,200, m 0 30;

n is 8 50;

n 5 40;
Z —CO—, —SO ₂ -;
Q-OH, CF ₃ , -CF (CF ₃ ) ₂ ,
in an amount of 0.01 to 5.0 wt.  2. The composition according to p. 1, characterized in that the solvent contains trifluorotrichloroethane, or perfluoropentane, or polyfluorochloroalkane, or polyfluorohydroalkane with a carbon number of 5 to 10.  3. The composition according to p. 1, characterized in that the solvent contains water in a mixture with 0.01 to 5.0 wt. fluorine-containing cationic, or nonionic, or ampholytic emulsifier.

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