Polymer composition

 

The invention relates to the production of color, particularly white, highly filled polymer compositions and can be applied in the production of products and materials with high hardness and adhesion to the metal substrate Bonito, rubber products, polymer base for abrasive powders of various types. The composition comprises, in wt.%: natural rubber - 14-30, butadiene rubber - 1,0-1,84, namakarana rubber - 1,0-16, 6mm, zinc - 1-13, kremachoclet - 4,5-25,00, stearic acid - 0,3-3,0, sulfur polymer - 1,1-is 11.39, diphenylguanidine - 0,1-3,0, tetramethylthiuramdisulphide - 0,01-1,00, phthalic anhydride - 0,03-0,20, pigment - 0.18 to 2.5, the abrasive powder is 2.0 - 41,95. The technical result is an increase in operating life due to the increase in the hardness up to 983.E. shore and adhesion to 3.3 MPa to a metal substrate. table 1.

The invention relates to the production of colored (white) vysokopolimernyh polymer compositions having high hardness and adhesion to the metal substrate after vulcanization, can be used in the production Bonito, rubber products, polymer base for abrasive powders different ipodslave medical equipment and instruments.

Known analog (Ershov Century. And., black C. I., Volkov, L. T., Shortcuts, B. C. manufacturing Technology colour rubber discs for weightlifting bars // the Manufacture of tires, rubber and ATI, M, 1981, 6, S. 15-17) based on the best choice of rubber SKS-30 ark, with good adhesion to steel and cast iron with hardness indicator 755.E. shore, achieved by the introduction of resin BSC-45 DCA.

The disadvantage of this polymer composition is a necessary operation when kleivane her lacunata and its further covulcanization with the metal substrate, which greatly complicates and increases the cost of the process.

Also known closest analogue (Pugach, I. Vulcanization of rubber mixtures with the use of oxides of metals of various types and quality. Diss. on saisc. academic step. K. so-called, the VSTA, 1998 - S. 155) based on the combination of butadiene and nitrile rubbers. The composition contains a group of mineral fillers and abrasive powders, wt.%: The synthetic rubber butadiene ACS LS,2 - of 19.03 synthetic Rubber nitrile SKN-26 AMPC - of 19.03 synthetic Rubber butadiene SCDL 250 - 4,23 technical Sulfur - 2,11 Tetramethylthiuramdisulphide - 0.63 Magnesium oxide - 2,11 Acid is to abrasive 33,83
Total: - 100,00
This song was used in the manufacture of medical products (grinding heads for processing dental filling materials). The formula of this polymer composition provides adhesion to the metal substrate after vulcanization without the use of lacunata.

Disadvantages closest analogue is the hardness of the product, not exceeding 855. E. shore, adhesion to a metal substrate is less than 2 MPa (20 kgf/cm2) that does not meet the conditions of grinding on modern dental equipment, namely, at high speeds the processing of filling materials. The use of synthetic nitrile rubber SKN-26 AMPS does not provide sufficient resistance to shear deformation of the product during grinding and reduces the lifetime due to the rapid destruction of the thin edges. In addition, the presence of magnesium oxide as a vulcanization activator leads to the increase of technological losses. Use chalk contributes to the increase in the weight of products and the emergence of radial run-out at high speeds grinding.

The technical result is an increase in exploitation/cm2) to a metal substrate.

This is achieved using a triple combination of rubbers: natural isoprene rubber light varieties of RSS, SVR, SMR and others; bright varieties namakarana the best choice of rubber SKS-30 ark, SCS-30 ARKN) and butadiene rubber (SKD-2). In addition, the mixture is introduced polymeric sulfur, diphenylguanidine, phthalic anhydride, pigment.

The inventive composition comprises the following components: wt%:
Natural rubber - 14.00-30.00
Butadiene rubber - 1.00-11.84
Namakarana the best choice rubber - 1.00-16.60
Zinc white - 3.00-15.00
Titanium white - 1.00-13.00
Kremachoclet - 4.50-25.00
Stearic acid - 0.30-3.00
Sulfur polymer - 1.10-11.39
Diphenylguanidine - 0.10-3.00
Tetramethylthiuramdisulphide - 0.01-1.00
The phthalic anhydride - 0.03-0.20
Pigment - 0.18-2.50
Abrasive powder - 2.00-41.95
Total: - 100.00%
The use of natural rubber provides increased value of the adhesion of the polymeric composition, its main technological properties during manufacture. Use namakarana the best choice and butadiene rubbers promotes wear of the product when the shear stress and the possibility centuries eveningwhen provides increased hardness of the polymer composition.

The optimal dosage of titanium dioxide provides the ability in combination with pigments to obtain a wide range of color tones of the polymer composition. Zinc white provide curing properties of the composition and differ slightly from the closest analogue on percentage.

The technology of obtaining polymeric composition is to mix the ingredients in the mill, podpisovanie and vulcanization of finished products on the vulcanizing press.

EXAMPLE 1. Mixture: 14.00% natural rubber; 11.84% ACS; 16.60% SCS-30 ARKN; 3.00% zinc oxide; 1.00% of titanium dioxide; 4.50% silicic acid Aerosil 300; 0.30% stearic acid; 1.10% sulfur polymer; 3.00% of diphenylguanidine; 0.01% of tetramethylthiuramdisuphide; 0.20% of phthalic anhydride; 2.50% pigment; 41..95% of electrocorundum M-28 is mixed at a temperature of 70oC for 15 min on rollers 320 LB and pressed with a further vulcanization on the vulcanizing press force 100 TC at a temperature of 170oC for 25 min in the form of a washer 4 mm

Obtained in the example 1 polymer composition has a relatively low hardness 85-88.E. shore, and very low adhesion to metal 0.50.6 MPa (5

EXAMPLE 2. Mixture: 14.70% natural rubber; 11.02% ACS; 11.02% SCS-30 ARKN; 7.35% of zinc oxide; 12.87% of titanium dioxide; 23.90% silicic acid Aerosil 300; 2.20% stearic acid; 5.50% sulfur polymer; 1.84% of diphenylguanidine; 0.55% of tetramethylthiourea 0.15% phthalic anhydride; 0.81% pigment; 8.09% electrocorundum M-28 manufactured according to the technology described in example 1.

This results in a sharp increase of the hardness values of up to 93.E. shore and adhesion to 2.5 MPa(25 kgf/cm2), improve the technological parameters (Valuehost, the optimum vulcanization).

EXAMPLE 3. Mixture: 18.39% natural rubber; 3.68% ACS; 14.70% SKS-30 ark; 11.02% zinc white; 7.35% titanium oxide; 16.54% silicate BS-120; 1.11% stearic acid; 7.35% sulfur technical; 0.81% diphenylguanidine; 0.11% of tetramethylthiuramdisuphide; 0.18% phthalic anhydride; 0.37% of pigment; 18.39% of electrocorundum 8 mixed by technology, there are in in.E., that is a sufficient condition for the quality polymeric composition for use as a polymer base heads elastic sanding, adhesion increases up to a level of 2.8 MPa (28 kgf/cm2), which is minimally sufficient to operate at high speeds grinding. Disadvantages for manufacturability mentioned in example 1, the mixture also does not have.

EXAMPLE 4. Mixture: 29.41% natural rubber; 1.84% ACS; 5.50% SKS-30 ark; 9.19% zinc white; 3.69% titanium oxide; 9.19% silicic acid Aerosil 100; 0.74% stearic acid; 9.19% sulfur polymer; 0.55% of diphenylguanidine; 0.07% of tetramethylthiuramdisuphide; 0.11% of phthalic anhydride; 1.11% pigment; 29.41% diamond technical faction 80/63 mix according to the technology described in example 1.

The resulting composition has a maximum value shore hardness: 98-99.E., adhesion to metal 3.3 MPa (33 kgf/cm) and does not have the disadvantages described in example 1. The composition of the recipe polymeric composition is optimal.

EXAMPLE 5. Mixture: 30.00% natural rubber; 1.00% ACS; 1.00% ACS-30 ARKN; 15.00% zinc white; 13.00% titanium oxide; 25.00% silicic acid Aerosil 300; 0.30% stearic acid; 11.39% sulfur polymer; 0.10% of diphenylguanidine; 1.00% Tetra is echnology, example 1.

Vulcanized products made from the composition of example 5 has the following disadvantages: high level of adhesion of the obtained average value shore hardness in combination with a very fragile edges of the product, which leads to rapid wear of the sample during grinding; niedoprecyzowania product in a desired shape due to too high speed of vulcanization; raw polymeric composition adheres to the surface of roller equipment, air bubbles are formed, which leads to unstable weight of the finished product and, consequently, to increased beating of products at high speeds grinding.

The results of the tests in examples 1-5 are shown in table.

From the above examples it is seen that the maximum values of hardness and adhesion has a polymer composition obtained in example 4, which can be successfully used in the production, composition 3 also has quite a good result and can be used for products with greater elasticity, composition 2 is quite suitable for products running under a small load, due to the fact that the strength of bonding with the metal substrate is slightly lower; the remaining songs don't have Sonia

Polymer composition comprising a butadiene rubber, zinc and titanium oxide, kremnekislyh, stearic acid, tetramethylthiuramdisulphide and abrasive powder, characterized in that it additionally contains natural and namakarana the best choice rubbers light marks, diphenylguanidine, pigment, phthalic anhydride, sulfur polymer in the following ratio, wt.%:
Natural rubber - 14 - 30
Butadiene rubber - 1,00 - 11,84
Namakarana the best choice rubber - 1,00 - 16,60
Zinc white - 3 - 15
Titanium white - 1 - 13
Kremachoclet - 4,50 - 25,00
Stearic acid is between 0.30 to 3.00
Sulfur polymer - 1,10 - is 11.39
Diphenylguanidine - 0,10 - 3,00
Tetramethylthiuramdisulphide - 0,01 - 1,00
The phthalic anhydride - 0,03 - 0,20
Pigment - 0,18 - 2,50
Abrasive powder - 2,00 - 41,95

 

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