SU761549A1 - Protective grease - Google Patents

Description

The invention relates to protective lubricants and is intended for use in order to protect against corrosion of various products from ferrous and non-ferrous metals. In particular, the lubricant can be used to protect against corrosion of the supports of hydraulic structures in the zone of periodic wetting and metal structures of spans, bridges, to protect wires, cables, fixtures and power transmission lines up to 500 kV, as well as to protect the sections of the hull and the undercarriage from corrosion. parts of cars.

Known protective plastic grease, operated in contact with sea water. Such lubricants include AMC-3 lubricants (GOST 2712-52). PVK (GOST 10586-63), SPI-10 (VTU M3 50-66), ZES [1].

Composition, mass. % of lubricants:

AMC.

Aluminum oleostearate 18-22

Oil "Vapor" Else

PVKPetrolatum 60-70

Ceresin 3.0-5.0

МНИ-70 (oxidized

ceresin) 0.9-1.1.

SPI-10.

ten

15

Ceresin brand 67 or 75

High pressure polyethylene

Zinc soap of synthetic fatty acids (C ₁₇ —SGO)

Corrosion Inhibitor - Vat residue of synthetic fatty acids

Oil MVP ZES.

Aluminum soap SLC (Xu-Xu)

Petrolatum

Vapor oil

14—16

1.9-2.1

9—11

2.9-3.1

Rest

3-5

5-7

Rest

However, these lubricants have not enough high protective properties in harsh seawater conditions, and they cannot be applied to products from the melt, because during the melting process they irreversibly change their properties: melting temperature, tensile strength and colloidal stability. In most cases, a protective plastic grease must be applied to the product by dipping from a melt. Hydrocarbon grease PVC though 30 can be applied to the product from the melt,

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761549

3 ··. ·

four

Relatively residual

It has a low melting and slipping point (50 ° C). ...

The proposed lubricant composition is closest to the protective lubricant HBG-3 based on petrolatum, ceresin, barium sulfonate and oxidized petrolatum of the following composition, weight. %:

High pressure polyethylene brand

1080–020 5–15 ι

Ceresin brand 67 5-10

Additive - sulfonate

barium (SB-3) 5-10

Oxidized Petrolatum

with saponification number not 1

less than 80 mg KOH / g 3-5

Petrolatum sulfuric acid Elimination [2]

However, this lubricant is inoperative at elevated temperatures and mechanical loads, since it is characterized by low creeping temperatures (70 ° C) and dropping (90 ° C), low tensile strength at 20 ° C (7.8 g / cm ² ), to keep a continuous layer on the metal surface at 80 ° C, equal to 6.0 mg / cm ² , frost-resistant to —30 ° C. The layer of grease on the steel roller has a loose film.

The drawbacks of HBG-3 grease are due to the lack of compatibility of petrolatum with high-pressure polyethylene, which is expressed in the difficult solubility of polyethylene in petrolatum, which leads to shrinkage during solidification of the lubricant and to the crucible structure of the lubricant.

The aim of the invention is to ensure the performance of the lubricant at elevated temperatures and mechanical loads. s

This goal is achieved by the fact that the lubricant based on petrolatum, barium sulfonate, ceresin and oxidized petrolatum additionally contains the product of copolymerization of ethylene with propylene with the content _{of the} latter 40-50 mol. % (SKEP-40) in the following ratio of components, weight. %:

SKEP-40 10—15 Ceresin 5-10 Barium sulfonate (SB-3) 5-10 Oxidized Petrolatum 3-5 Petrolatum Up to 100

SKEP-40 is used as a raw material component in the production of rubber products (TU No. 38103231-74) and is characterized by the following properties: Mooney viscosity

B-1-4-100 36-45

Strength at

breaking with soot on

or PM-75, kg / cm ^and 180–190

Relative extension

at break,%, not

less than 400

elongation,%, not more than · 32 Rebound elasticity, %, not less 38 Weight loss during drying, %, no more 0.7 Ash content before dusting,%, not more 0.5 The metal content before dusting,%, not more: vanadium 0,010 copper 0.0004 gland 0,010 The amount of alcohol toluene extract,%, not more than 5.0 Antioxidant content,% neozone D 0.15—0.3

Technology cooking grease.

To petrolatum, dehydrated by evaporation at 110 ° C, add ceresin until completely melted. The mixture obtained is fed in portions of EPDM-40 at 120–130 ° C, previously crushed to pieces weighing about 0.5 g. The total solubility is established by the sample on a glass slide. After complete dissolution of the EPDM-40, the mixture of additive SB-3 with oxidized petrolatum prepared in advance at 80-85 ° C is added to the mixture at 120 ° C. Cooking grease is carried out with continuous stirring at 120-130 ° C for 10 hours. Get a lubricant, ready to use.

The lubricant is applied to the surface to be protected with a uniform layer 1–1.2 mm thick manually with a spatula or a brush.

The compositions of lubricants according to the invention are given in table. one.

The test results of the proposed lubricants No. 1-6 (in the No. 3 lubricant, the content of SEP-40 is lower than the proposed concentration) and the known HBG-3 No. 7 lubricant are presented in Table. 2

As can be seen from the results of the tests given in table. 2, when the EPDM-40 content is less than 10%, the physico-chemical characteristics of the lubricant, namely the dropping point, slip temperature, layer continuity, tensile strength at 20 ° C, slightly exceed the corresponding values of the known HBG-3 lubricant. With an EPDM-40 content of more than 15%, the lubricant becomes a solid rubber-like mass, which is almost impossible to apply to the protected surface even when it is very hot - up to 150 ° C, the physicomechanical properties of this lubricant are almost impossible to determine.

Therefore, the optimal content of EPDM-40 in the lubricant is 10–15%.

The protective properties of the proposed lubricant evaluate the corrosion rate of the metal under the film of lubricant in sea water. With this

761 ^ 49

5 β

Б a b l And c 8 1

Component Sawyer'Jan'GF, £ ec. & Composition number I 2 3 four  five 6 7 SKEP-40 13 ten five 15 ten 6 Ceresin 7 five five ten ten 7 ten Additive SB-3 eight five ten ten five five five Oxidized Petrolatum four five five five 3 five 3 Petrolatum 68 75 75 60 72 77 72 High pressure polyethylene ten

table 2

room composition Temperature dropping, ° C The ability to maintain a continuous layer on the metal surface, mg / cm ² , at a temperature, ° С Temperature sliding down ° С Strength at 20 ° С, g / cm ² Evaporation% Change of properties at 10-fold heating to 120 ° С 80 100 120 I 120 10.0 10.0 7.0 100 18.0 0.2 Do not change 2 115 10.0 10.0 6.5 100 18.5 0.2 Also 3 95 7.0 2.0 0.0 75 10.0 0.3 four 122 10.0 10.0 8.0 105 20.0 0.1 five 112 10.0 10.0 6.0 100 19.0 0.3 6 96 7.5 2.0 0.0 76 10.0 0.3 7 90 6.0 0.0 0.0 ⁷⁰ 7,8 0.5 Reduced tensile strength at 20 ^hours

Note. The temperature of dropping is determined according to GOST 6793-74, the creep temperature is

according to GOST 6037-75, the ability to maintain a continuous layer on the metal surface — according to GOST 6953_54,

evaporability — according to TU 3820131-74 according to section 3.5; tensile strength — according to GOST 7143-54.

The purpose of the steel and aluminum plates covered with a lubricant thickness of 10 microns and placed in seawater, where it is kept for 30 days.

The corrosion rates of steel and aluminum specimens coated with the proposed and known lubricants are given in Table 3.

Table 3

Grease composition The subject metal The corrosion rate of samples, g / m ² -h Power protection, % Steel 0,0037 94 № 7 Aluminum 0,0011 98 Steel 0,0000 100 No. 1-6 Aluminum 0,000 100

creeping at 30 ° С, frost resistance at 30 ° С, its other indicators are also improved: layer continuity, evaporation, as well as protective properties. Proposed

5 lubricant does not change properties after repeated melting.

Claims (1)

Claim Protective lubricant based on petrolatum, ceresin, barium sulfonate and oxidized petrolatum, characterized in that, in order to ensure operability 15 lubricants at elevated temperatures and mechanical loads, the lubricant additionally contains the product of copolymerization of ethylene with propylene with the content of the latter 40-50 mol. % at the next co20 ratio of components, weight. %: Copolymerization product ethylene with propylene content of the latter , 40-50 mol. % 10—15 25 Ceresin 5-10 Barium sulfonate 5-10 Oxidized petrolatum 3-5 P. Petrolatum Up to 100 From tab. 3 shows that the protective properties of the proposed lubricant is higher than that of the known HBG-3 lubricant. The lubricant according to the invention is much more effective than the known lubricant HBG-3, because it exceeds its temperature dropping at 25 ° C, according to temperature