RU2519402C2 - Polymer composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry, in particular to production of rubber products, intended for application as mechanical rubber products. Polymer composition can be used for manufacturing rubber products for different household purposes, working in contact with aggressive media, at higher temperatures, and for creation of construction products together with rubbers on the base of general purpose rubbers. Polymer composition contains butadiene-nitryl rubber CKH-40, sulphur, altax, diphenylguanodine, zinc white, stearic acid, dibutylphthalate, modifier - mixture of fullerenes of fraction C₅₀ - C₉₂ and anti-ageing agents - acetonanyl R and diaphene FP and filling agent - mixture of technical carbon P-234 and chalk GPC.

EFFECT: elaboration of formula of polymer composition with improved technological properties, increased strength and resistance to impact of aggressive media.

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Description

The invention relates to the chemical industry, in particular, to the production of rubber compounds, and can be used in the manufacture of rubber products.

Known polymer composition for the manufacture of sealing and other products that are in contact with oils and fuels, which contain a combination of ingredients, including rubber butadiene-nitrile paraffinic BNKS-18A (AN), rubber butadiene-nitrile paraffinic BNKS-40A (AN) , sulfur, N-N'-dithiodimorpholine, N-cyclohexyl-2-benzthiazolylsulfenamide, tetramethylthiuramdisulfide, zinc oxide, poly-2,2,4, -trimethyl-1,2-dihydroquinoline, N-phenyl-N'-isopropyl-p -phenylenedeamine, petroleum paraffin, technical carbon P-803, technical carbon th P-324, dibutyl sebacinate, stearic acid, N-nitrosodiphenylamine [RF Patent No. 21545440 "Polymer composition" Arkhireeva SN, Karnaukhov Yu.G., Letova L.N., Potapova S.A., Nikolaeva N.S. ., Sharipova R.A., publ. 04/20/2001].

The disadvantage of the above rubber compound is the relatively low resistance to fuels and oils of vulcanizates obtained on its basis, and insufficient tensile strength.

The closest in technical essence and the achieved effect is a polymer composition with improved characteristics, including SKN-18 nitrile butadiene rubber, sulfur, altax, diphenylguanidine, zinc oxide, stearic acid, P-803 carbon black, dibutyl phthalate [TU 2512-046-00152081 -2003].

The disadvantage of this polymer composition is the relatively low resistance to oils of vulcanizates obtained on its basis, the mixture has a low vulcanization rate, applicable only for bulk products and low productivity of the process for consumer goods.

An object of the invention is to develop a formulation of a polymer composition with increased strength and resistance to aggressive environments.

The object of the invention is achieved in that in a polymer composition characterized in that it comprises nitrile butadiene rubber SKN-40, the modifier is a mixture of fullerenes of fraction C ₅₀ -C ₉₂ and antioxidants are acetonanil P and diafen FP, and the filler is a mixture of carbon black P-234 and chalk IMO in the following ratio of ingredients, wt.%:

nitrile butadiene rubber SKH-40 56,295-55,273 sulfur 2,030-2,210 altax 1,410-1,380 diphenylguanidine 0.169-0.166 zinc white 2,820-2,760 stearic acid 1,130-1,100 dibutyl phthalate 5,630-7,180 technical carbon P-234 11,300-11,050 chalk IMO 16,900-16,570 mixture of fullerenes C ₅₀ -C ₉₂ 0.056-0.111 acetonanil P 1,100-1,130 Diafen FP 1,100-1,130,

the resulting polymer composition is used for the manufacture of rubber and rubber products, adhesives and oil-petrol-resistant composite materials, etc.

The technical result of the invention is to increase resistance to aggressive environments, increase strength and improve the technological properties of the composition, in environmental safety and low toxicity of finished products.

A method of preparing a polymer composition is as follows.

Rubber and other ingredients are weighed on technical scales. SKN-40 butadiene-nitrile rubber is rolled on pre-heated to 50 ± 5 ° C rollers, then the ingredients are added sequentially: carbon black P-234, zinc oxide, stearic acid, chalk IMO, dibutyl phthalate, acetonanil R, diafen FP, a mixture of fullerenes C ₅₀ -C ₉₂ , altax, diphenylguanidine, sulfur; the mixture is prepared for 20 minutes and removed in the form of a sheet at a temperature not exceeding 100 ° C; the resulting rubber sheet is cooled in air to 30 ° C and quenched with a clean pad.

The polymer composition is prepared in the following ratio of ingredients, wt.%:

nitrile butadiene rubber SKN-40 56,295-55,273 sulfur 2,030-2,210 altax 2.5 1,410-1,380 diphenylguanidine 0.169-0.166 zinc white 2,820-2,760 stearic acid 1,130-1,100 dibutyl phthalate 5,630-7,180 technical carbon P-234 11,300-11,050 chalk IMO 16,900-16,570 a mixture of fullerenes C ₅₀ -C ₉₂ 0.056-0.111 acetonanil P 1,100-1,130 Diafen FP 1,100-1,130

The use of C ₅₀ -C ₉₂ fullerenes mixture in the formulation makes it possible to obtain a polymer composition with high physicomechanical parameters of vulcanizates, in addition, the fullerene mixture provides increased resistance of the polymer composition to aggressive media, in particular hydrocarbons, due to the formation of additional chemical bonds in the composite. The use of SKN-40 rubber can partially improve the oil and petrol resistance of the composition due to the increased content of nitrile acrylic groups in the rubber, while the technological properties of the composition are ensured by the combination of P-234 active carbon black and MMO chalk filler in combination with the optimal dosage of the auxiliary component of dibutyl phthalate. In combination with fullerenes, acetoneam P and diafen AF provide the necessary level of resistance to thermal and fatigue aging of the composition.

The developed polymer composition has good technological properties, can be easily processed on existing equipment, finished products are non-toxic and environmentally friendly.

Polymer compositions made according to the proposed recipe can be used both independently for the manufacture of rubber products for various household purposes, working in contact with aggressive media at elevated temperatures, and for the creation of structural products together with rubbers based on general-purpose rubbers.

The method is illustrated by the following examples.

Example 1. (prototype).

To prepare 1 kg (100,000 wt.%) Of the rubber mixture, technical weights weighed 0.56295 kg (56.295 wt.%) Butadiene-nitrile rubber SKN-18, 0.02820 kg (2.820 wt.%) Zinc oxide, 0.01130 kg (1.130 wt.%) ) stearic acid, 0.05630 kg (5.630 wt.%) dibutyl phthalate, 0.16900 kg (16.900 wt.%) chalk IMO, 0.11300 kg (11.300 wt.) carbon technical P-234, 0.02030 kg (2.030 wt.%) sulfur, 0.01410 kg (1.410 wt.%) altax, 0.00169 kg (0.169 wt.%) diphenylguanidine. The polymer composition is prepared on rollers at a temperature of 55 ° C and a gap between the rollers of 2 mm First, rubber is rolled for 3 minutes, why all the ingredients are added alternately, except sulfur, altax and diphenylguanidine, rolled for 10 minutes; after that sulfur, altax and diphenylguanidine are introduced, rolled for 1 min. The total mixing time is 14 minutes. The rubber mixture obtained in the form of a sheet is cooled in air to 30 ° C and quenched with a clean pad.

The finished rubber mixture is analyzed and determined: conditional tensile strength, elongation at break (GOST 21751), hardness (GOST 263-75), brittleness temperature (GOST 7912-74), mass change in standard media (GOST 9.030-74), thermal aging (GOST 9.024-74). The analysis data are presented in table 1.

Example 2. To prepare 1 kg (100,000 wt.%) Of the rubber mixture, weights of 0.56295 kg (56.295 wt.%) Butadiene-nitrile rubber SKN-40, 0.02820 kg (2.820 wt.%) Zinc oxide, 0.01130 kg (1.130 kg) are weighed on a technical balance wt.%) stearic acid, 0.05630 kg (5.630 wt.%) dibutyl phthalate, 0.16900 kg (16.900 wt.%) chalk IMO, 0.11300 kg (11.300 wt.%) carbon technical P-234, 0.00056 kg (0.056 wt.%) mixtures of C ₅₀ -C ₉₂ fullerenes, 0.02030 kg (2.030 wt.%) sulfur, 0.01410 kg (1.410 wt.%) altax, 0.00169 kg (0.169 wt.%) diphenylguanidine, 0.01130 kg (1.130 wt.%) acetonanil P, 0.01130 kg (1.130 wt.%) AF diaphen. The polymer composition is prepared on rollers at a temperature of 55 ° C and a gap between the rolls of 2 mm First, the rubber is rolled for 3 minutes, then all the ingredients, except sulfur, altax and diphenylguanidine, are added alternately, and rolled for 10 minutes; after that sulfur, altax and diphenylguanidine are introduced, rolled for 1 min. The total mixing time is 14 minutes. The rubber mixture obtained in the form of a sheet is cooled in air to 30 ° C and quenched with a clean pad.

The finished rubber mixture is analyzed and determined: conditional tensile strength, elongation at break (GOST 21751), hardness (GOST 263-75), brittleness temperature (GOST 7912-74), mass change in standard media (GOST 9.030-74), thermal aging (GOST 9.024-74). The analysis data are presented in table 1.

Example 3. To prepare 1 kg (100,000 wt.%) Of the rubber mixture on a technical scale, 0.55273 kg (55.273 wt.%) Butadiene-nitrile rubber SKN-40, 0.02760 kg (2.760 wt.%) Zinc oxide, 0.01100 kg (1.100 kg) are weighed wt.%) stearic acid, 0.07180 kg (7.180 wt.%) dibutyl phthalate, 0.16570 kg (16.570 wt.%) chalk IMO, 0.11050 kg (11.050 wt.%) carbon technical P-234, 0.00111 kg (0.111 wt.%) mixtures of C ₅₀ -C ₉₂ fullerenes, 0.02210 kg (2.210 wt.%) sulfur, 0.01380 kg (1.380 wt.%) altax, 0.00166 kg (0.166 wt.%) diphenylguanidine, 0.01100 kg (1.100 wt.%) acetonanil P, 0.01100 kg (1.100 wt.%) AF diaphen. The polymer composition is prepared on rollers at a temperature of 55 ° C and a gap between the rolls of 2 mm First, the rubber is rolled for 3 minutes, then all the ingredients, except sulfur, altax and diphenylguanidine, are added alternately, and rolled for 10 minutes; after that sulfur, altax and diphenylguanidine are introduced, rolled for 1 min. The total mixing time is 14 minutes. The rubber mixture obtained in the form of a sheet is cooled in air to 30 ° C and quenched with a clean pad.

The finished rubber mixture is analyzed analogously to example 2. The analysis data are presented in table 1.

Table 1

Indicator Prototype Example Analysis Data one 2 Conditional tensile strength, MPa 9.0 9.6 11.0 Elongation at break,% 290 250 220 Shore A hardness, cu 66 74 79 Mass change after exposure (72 h, normal conditions),% - isooctane / toluene (7: 3) 23.5 19.5 16.8 - toluene / hexane (1: 1) 57 42 40 - oil 6.7 5.1 4.9 The lower limit of fragility, (C - 45 - 45 - 45 Aging at 100 ° C for 72 hours - aging rate by conditional strength,% 21.9 22.3 22.5 - coefficient of aging at elongation,% 27.6 48.6 51.8

As can be seen from table 1, when introduced into the polymer composition of nitrile butadiene rubber SKN-40, a mixture of fullerenes C_fifty- FROM₉₂the amount of 0.056-0.111 wt.%, chalk IMO, antioxidants acetonanil P and diaphen AF, the properties of SKN-40 rubber-based rubbers are improved compared to previously proposed ones: elongation at break and mass change after exposure are reduced, tensile strength, Shore hardness, aging factors for conditional strength and elongation increase.

When SKN-40 butadiene-nitrile rubber is introduced into the polymer composition, a mixture of fullerenes C_fifty-FROM₉₂ in an amount of less than 0.056 wt.%, chalk IMO less than 16.900, acetonanil P is less than 1,100, AF diaphen is less than 1,100 the properties of rubber based on rubber SKN-40 do not change, and the mixture of fullerenes C_fifty-FROM₉₂ in an amount of more than 0.111 wt.%, chalk IMO more than 16.570 acetonanil P more than 1,130, AF diaphene more than 1,130 properties of rubber based on rubber SKN-40 are deteriorating.

The proposed polymer composition allows you to: improve the physico-mechanical properties of rubbers, ensure the stability of the polymer composition to the effects of aggressive environments, to obtain an environmentally friendly and low toxic finished product.

Claims (1)

A polymer composition, characterized in that it includes nitrile butadiene rubber SKN-40, a modifier is a mixture of fullerenes of fraction C ₅₀ - C ₉₂ and antioxidants are acetonanil P and diafen FP, a filler is a mixture of carbon black P-234 and chalk IMO in the following ratio ingredients, wt.%:
nitrile butadiene rubber SKN-40 56,295-55,273 sulfur 2,030-2,210 altax 1,410-1,380 diphenylguanidine 0.169-0.166 zinc white 2,820-2,760 stearic acid 1,130-1,100 dibutyl phthalate 5,630-7,180 technical carbon P-234 11,300-11,050 chalk IMO 16,900-16,570 mixture of fullerenes C ₅₀ -C ₉₂ 0.056-0.111 acetonanil P 1,100-1,130 Diafen FP 1,100-1,130.