Non-vulcanisable polyisobutylene-based rubber composition

FIELD: chemistry.

SUBSTANCE: invention relates to rubber-processing industry, in particular, to formula of non-vulcanisable polyisobutylene-based rubber composition, and can be used for manufacturing highly acid-, alkali- and oxidant-resistant sealing materials, as well as sheet anti-corrosive and waterproofing materials for chemical equipment and built structures. Non-vulcanisable rubber composition contains, parts by weight: polyisobutylene P-200-100, when required, semi-active technical grade carbon P-514-0-10, inactive inorganic filler - talcum powder, kaolin or mixture thereof -250-370, rubber resin SKD-2-10-20.

EFFECT: less adhesion to working surfaces of rubber-processing equipment; improved physical and chemical properties, corrosion resistance of the composition being retained.

6 tbl, 3 ex

 

The invention relates to the rubber industry, in particular to devulcanize rubber mixture of polyisobutylene brand P-200, and can be used for the manufacture of packing materials with high resistance to acids, alkalis and oxidizing agents, as well as sheet anti-corrosion and waterproofing materials for chemical plants and buildings.

Known devulcanized rubber stamps PSG of polyisobutylene brand P-200 - 100 parts by weight, including semi-active carbon black brand DG-100 - 100 parts by weight and graphite - 100 parts by weight of [see Handbook of reinsta. Materials rubber production. M.: Chemistry, 1971. p.185-186], selected as a prototype. This rubber compound is missing the rubber SKD-2.

Before developers were tasked to create a rubber mixture having a reduced adhesion to the working surface retinopathies equipment, improved physical and mechanical characteristics in comparison with the prototype, with lower cost and provides resistance to aggressive environments is not worse than the prototype. As an additive it is necessary to use available ingredients rubber compounds.

The problem is solved using devulcanized rubber mixture of polyisobutylene brand P-200, including the surrounding inactive inorganic filler, characterized in that it further contains a rubber SKD-2 and, if necessary, contains semi-active carbon black mark P-514, and as inactive inorganic filler includes talc, kaolin, or a combination of, the following ratio of components, rubber compounds, parts by weight:

Polyisobutylene brand P-200100,0
Semi-active carbon black P-5140,0-10,0
Inactive inorganic filler250,0-370,0
Rubber SKD-210,0-20,0

The introduction of rubber SKD-2 provides improved technological and operational properties of the rubber while maintaining resistance to aggressive media. Improved technological characteristics manifested in the reduction of adhesion of the mixture to the rolls during processing on standard roller equipment (rollers, calender), increases the plasticity of the mixture, which allows you to enter large amounts of inactive inorganic filler, which in turn leads to reduction in the cost of the rubber. Improvement of operational properties identified in increasing the cohesive strength of the rubber, the relative increase and decrease of the residual movements. Increase cohesion coloring strength the mixture and provides a smoother surface kalandrovogo material and allows to get rid of the defect in the form of bubbles on the surface.

On the proposed decision were made of the rubber-based polyisobutylene brand P-200, including inactive inorganic filler, rubber SKD-2 and semi-active carbon black to impart a black color.

As a semi-active carbon black used carbon black mark P-514 (GOST 7885-86).

As inactive inorganic filler used talc, kaolin or a combination of both.

Determination of physico-mechanical characteristics of rubber compounds was carried out on a tensile testing machine RMI-250 with pendulum siloizmeritel according to GOST 270-75 (ST SEV 2594-80). Samples were made in accordance with the General requirements for physical and mechanical tests GOST 269-66 (ST SEV 983-89).

Preparation of rubber mixtures was carried out on mixing rollers 1500×600/600 in accordance with the following regime:

Heating of polyisobutylene brand P-2000-10 min
The introduction of rubber SKD-210-20 min
The introduction of kaolin and carbon black20-40 min
The introduction of talc40-70 min
Homogenization of the mixture70-80 min
Removing the mixture with roller80-85 min
Total dir is m mixing 85 min

Example 1. In the mill according to the mode of preparing the rubber-based polyisobutylene brand P-200. The compositions of the mixtures are given in table 1, a mixture of 1 prototype, a mixture of 2-6 on the proposed technical solution.

Table 1

The composition devulcanizing rubber mixtures of polyisobutylene brand P-200
IngredientComposition, parts by weight
123456
Polyisobutylene brand P-200100,0100,0100,0100,0100,0100,0
Carbon black DG-100100,0
Graphite100,0
Carbon black P-51410,010,010,010,010,0
Talc300,0300,0300,0300,0300,0
Kaolin70,070,070,070,070,0
Rubber SKD-25,010,015,020,030,0

Properties devulcanizing rubber mixtures of polyisobutylene brand P-200 are given in table 2.

41
Table 2

Properties devulcanizing rubber mixtures of polyisobutylene brand P-200
IndexMixture
1 (prototype)23456
Stress at elongation of 100%, MPathe 3.82,86,26,56,86,0
Conditional tensile strength, MPathe 4.74,68,68,99,48,2
Elongation at break, %180220260310210190
Residual elongation, %757070504040
Stickiness on the tel-kPa3840463838
Stickiness on the tel-kPa293126241210
Chemical resistance effect:
nitric acid (32%)+++++±
sulfuric acid (50%)+++++±
hydrochloric acid (33%)+++++±
acetic acid (80%)+++++±
phosphoric acid (30%)+++++±
caustic potash (50%)+++++±
caustic soda (50%)+++++±
Aceto is and ++++++
glycerin++++++
ethanol++++++
ozone++++++

According to table 2 of the proposed devulcanized rubber mixtures have higher stress values when the elongation of 100%of the nominal tensile strength, large relative smaller residual movements and stickiness, not inferior in adhesiveness to the prototype.

Example 2. In the mill according to the mode of preparing the rubber-based polyisobutylene brand P-200. The compositions of the mixtures are given in table 3, a mixture of 1 prototype, a mixture of 2-6 on the proposed technical solution.

Table 3

The composition devulcanizing rubber mixtures of polyisobutylene brand P-200
IngredientComposition, parts by weight
123456
Polyiso the stylish brand P-200 100,0100,0100,0100,0100,0100,0
Carbon black DG-100100,0
Graphite100,0
Talc200,0200,0200,0200,0200,0
Kaolin50,050,050,050,050,0
Rubber SKD-25,010,015,020,030,0

Properties devulcanizing rubber mixtures of polyisobutylene brand P-200 are listed in table 4.

Table 4

Properties devulcanizing rubber mixtures of polyisobutylene brand P-200
IndexMixture
1 (prototype)23456
12345 67
Stress at elongation of 100%, MPathe 3.84,14,24,24,0the 3.8
Conditional tensile strength, MPathe 4.74,24,44,54,54,0
Elongation at break, %180290220190190180
Residual elongation, %75120100909080
Stickiness on the tel-kPa414243444139
Stickiness on the tel-kPa293228262018
Chemical resistance effect:
nitric acid (32%)+++++±
sulfuric acid (50%)+++++±
hydrochloric acid (33%)+++++±
acetic acid (80%)+++++±
phosphoric acid (30%)+++++±
caustic potash (50%)+++++±
caustic soda (50%)+++++±
acetone++++++
glycerin++++++
ethanol++++++
ozone++++++

According to table 4 of the proposed devulcanized rubber compound is not inferior to the prototype by the values of stress at elongation of 100%of the nominal tensile strength residual elongation, glue the spine, provide large relative elongation, less stickiness.

Example 3. In the mill according to the mode of preparing the rubber-based polyisobutylene brand P-200. The compositions of the mixtures are shown in table 5, a mixture of 1 prototype, a mixture of 2-5 on the proposed technical solution.

Table 5

The composition devulcanizing rubber mixtures of polyisobutylene brand P-200
IngredientComposition, parts by weight
12345
Polyisobutylene brand P-200100,0100,0100,0100,0100,0
Carbon black DG-100100,0
Graphite100,0
Carbon black P-51410,010,010,010,0
Kaolin300,0200,0100,00,0
Talc0,0100,02000 300,0
Rubber SKD-25,010,015,020,0

Properties devulcanizing rubber mixtures of polyisobutylene brand P-200 are listed in table 6.

30
Table 6

Properties devulcanizing rubber mixtures of polyisobutylene brand P-200
IndexMixture
1 (prototype)2345
Stress at elongation of 100%, MPathe 3.86,15,55,8a 4.9
Conditional tensile strength, MPathe 4.77,77,27,76,9
Elongation at break, %180210230260270
Residual elongation, %75436170102
Stickiness on the tel-kPa4142424345
Stickiness on the tel-kPa29322927
Chemical resistance effect:
nitric acid (32%)+++++
sulfuric acid (50%)+++++
hydrochloric acid (33%)+++++
acetic acid (80%)+++++
phosphoric acid (30%)+++++
caustic potash (50%)+++++
caustic soda (50%)+++++
acetone+++++
glycerin+++++
ethanol+++++
ozone++ +++

According to table 6 of the proposed devulcanized rubber compound is not inferior to the prototype by the values of stress at elongation of 100%of the nominal tensile strength residual elongation, adhesiveness, provide large relative elongation, less stickiness.

The use of large doses of inactive inorganic fillers leads to a significant reduction in the cost of rubber compounds. Enter the rubber SKD-2 less than 10 parts by weight per 100 parts by weight of polyisobutylene (PIB) is impractical because for rubber mixtures with a lower dosage of rubber SKD-2 there is a strong adhesion of the rubber to the working surface of the rolls by mixing on a roll mill and a lower level of physical and mechanical properties. Adhesion to the surface of the rolls is characterized by a measure of the "stickiness", which decreases with increasing dosages of rubber SKD-2. The indicator "stickiness" characterizes automazione properties of rubber compounds and practically does not depend on the composition of the rubber mixture. Enter the proposed addition is more to 20.0 parts by weight per 100 parts by weight of polyisobutylene (PIB) is impractical because for rubber mixtures with a higher dosage of the proposed additions, the decrease of the resistance to aggressive environments. The above results are achieved when used in the composition devulcanize the rubber mixture as an inactive filler kaolin, talc, or combinations thereof.

Thus, the decision to use the available ingredient of rubber compounds, the introduction of which into the rubber mixture provides a reduction in the adhesion to the working surface retinopathies equipment, the improvement of physico-mechanical characteristics in comparison with the prototype, lower cost and resistance to aggressive environments is not worse than the prototype.

Devulcanized rubber mixture of polyisobutylene P-200, including inactive inorganic filler, characterized in that it further contains a rubber SKD-2 and, if necessary, contains semi-active carbon black P-514, and as inactive inorganic filler includes talc, kaolin, or a combination of the following ratio of components, rubber compounds, parts by weight:

polyisobutylene P-200100
semi-active carbon black P-5140-10
the specified inactive inorganic filler250-370
rubber SKD-210-20



 

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