SU648109A3 - Method of obtaining rubbers - Google Patents

Description

(54) METHOD OF OBTAINING RUBBER

648109

Toluene diisocyanate Zinc oxide Sundex 8125 Note. S - Chgghzgm - Solpren 200 Santokur N - SBRCS 15 SBR l500 Sundex 8125 4010 MA -

31.4 19.2

58 77.9 297 420

144,139

72 69

19.0 67

520

270 68 sulfur; LIQUID. Hydroxypropyl polybutadiene GO degree of functionality of the prepolymer 2.2-2.4; polybutadiene; cyclohexyl-2-benzothiazole sulfamide; copolymer of butadiene and liquid hydroxylated styrene, containing 25 wt.% styrene, with a degree of functionality of the prepolymer of 2.15-2.8; copolymer of butadiene and styrene, containing 25 wt.% styrene; 70% aromatic oil mol. weighing 380, with beats. weighing 0.996; K-isopropyl N-phenyl-P-phenylenediamine. Table2 It follows from these results that sulfur vulcanization of the obtained elastomers is useless, because the moduli and hardness are too high for their use in pneumatic tires, while the elongation at break is far lower, which also prevents the use of elastomers for tires. Consequently, the properties of polymers obtained from prepolymers with a functionality greater than 2, even when the NCO / O ratio is 1: 1, are not enough to use in the production of pneumatic tires. PRI me R. 2 (comparative). Experiment Aj was carried out, which consisted in the reaction of hydroxylated forpsol polymer butal yen and styrene (the latter contains

Extension Module (100%), kg / s

The degree of elasticity recovery after deformation at

Scott crushing ratio

elongation at break,%

tensile strength at break, kg / cm2

Mohr hardness

It is not possible to obtain a copolymer with the same properties as that of the control sample, and a nominating rupture strength and degree of elasticity recovery after deformation are noted,

Froze Repeat the experiment Module elongation (100%), kg / cm

The degree of recovery of elasticity after deformation at 6

Scott crushing ratio: elongation at break,%

tensile strength at break, kg / cm

Mohr hardness

Table 3

19.0

67

590

270 68

Example 2, the conditions are similar with the only difference that the mixture is heated for 20 minutes at, then 20 minutes for better separation of the extension and vulcanization steps. The properties of both elastomers are given in table. four.

Table 4

19.0 67,

. 580

270 68 25 wt.%) Having a functionality of 1.97 and mol. weight 6000, with methylene diphenyl diisocyanate. The ratio of the number of reactive groups of NCO carbon-hydrogen chain extender and the number of reactive groups of the prepolymer is 1: 1 (when the mixture is ready). Simultaneously with the polyaddition reagent, vulcanization agents are introduced. The final mixture is heated for 1 hour, to 140 ° C, in order to carry out polyaddition and vulcanization reactions in one stage. In the experiment, 100 parts of prepolymer, 50 parts of carbon black (black HAF,), 1.7 parts of dicyclohexamine benzothiazyl sulfamide, 1.5 parts of sulfur, 4 parts of zinc oxide, iron acetylacetonate per 100 g of prepolymer are used. In tab. 3 shows the properties of rubber.

b 4 8, i О 9

When comparing the properties of copolymer a. Ag with Ag copolymer properties (from example 2) shows that Ad copolymer has greater tensile strength (approximately 100 kg / cm) and the degree of elasticity recovery due to bare strain, with about 2 O% higher.

In addition, copolymer A has properties that are equal to those of a classical copolymer.

Experiments with running-in are carried out with pneumatic ones. and tire treads, used as the main component in some experiments, copolymer A y, in accordance with the invention, in others the classic sapotrator of a pneumatic tire made from copolymer A 40% higher than the corresponding value of the control test ratio wear-adhesion ratio without exceeds the control sample. Examples 4-9. In this series of examples are copolymers, ispol. as prepolymer 100 parts of a hydroxylated butadi on polymer and styrene (the latter contains 12 by weight of styrene) c. functionality 1.97 and molecular weight 6000. Module elongation (100%), kg / cm 17, 4 17.2. The degree of recovery of elasticity after deformation at 62.6 62.6 Scott grinding coefficient 5 elongation at break,% 600 620 tensile strength at break, kg / cm 2 257 257 Shore hardness. 58 60

eight

Limer control sample. To compare the coefficients of friction and wear ie weight loss coefficient for i; n6se.

Wear factors are described by the relationship:

weight loss cups experience. - loss of weight of the tire.

roll sample

The coefficient of friction is measured at.

The weight loss is determined after the machine is poured on. a certain road and is attributed to the index 100 control tire.

The results are shown in table.5.

Table 5 of 5 components, wt.h,: carbon black (black HAF) 50, methylene diphenyl diisocyanate is such an amount that the ratio of NCO / OH is 1: 1 in the reaction mixture, sulfur 1.5, dicyclohexylamine benzothiazyl sulfamide 1.7, oxide. zinc 4, iron acetylacetonate 100 g of prepolymer. After homogenization, heat for 20 minutes at then 20 minutes at 1 dO. ° C. The results are given in Table. b, for comparison, the properties of the Control copolymer of butadiene and styrene, called stereo. 700, in which styrene is. 12% by weight. Control test of Stereon 700 16.7 17 17.2 62.1 62.2 613 603 257 260 59 59

The properties of the obtained copolymers are identical, which indicates a good reproducibility of the method according to the invention.

Run tests are carried out with the help of pneumatic tires, in terms of the coefficient of friction

Weight loss during wear,%

The superiority in terms of wear-adhesion of pneumatic tires and protectors, containing, as the main component, the elastomer obtained according to the invention is noticeable.

EXAMPLE 10 An elastomer diluted in oil is obtained, obtained from a copolymer of hydroxylated butadiene and styrene, containing 12% by weight of styrene, with a functionality of 1.97 and a mole. weighing 6000, taken as a prepolymer, and methylene diphenyl diisocyanate, taken as an extension of the hydrocarbon chain in such an amount that the ratio of NCO / OH is 1: 1 in the final mixture. Take the following quantities of the components, wt. CH of prepolymer 100, naphthenic oil (with a mol. Weight of 390, density

Extension Module (100%), kg / cm

The degree of elasticity recovery after deformation at

Grinding coefficient

elongation at break,

tensile strength at break, kg / cm

Hardness by litopy

In some experiments, the copolymer of Example 4 was taken as the main component of the treads; in others, the SBR 1500 test sample copolymer was used to compare the value of the coefficient of friction and the coefficient of weight loss when worn. The results are shown in Table. 7

Table 7

45,100

45 80

0.946 g / cm) 30, carbon black 65, zinc oxide 5, iron acetylacetonate 45-1СГг per 100 g of prepolymer, sulfur 1.17, disulfide bis (diisopropylthiophosphoryl) 1.56, monosulfidmercaptobenzrthiazole 0.482. Heat 20 min pr1I, then 22 min at. Examine the properties. Compare, the properties of the obtained product with the control copolymer (solprene 384) of butadiene and styrene. Take the next number of components, wt.%; copolymer 100, aromatic oil 37.5, carbon black 50, stearic acid 2, zinc oxide 1, 4010NA 1, Santokur N 1, sulfur 1.8. Vulcanize the mixture at 140c for 60 minutes.

The properties of the obtained vulcanizates are given in table. eight.

Table 8

188 70

420

Claims (1)

200 65 and it has been established that the properties of an eat volcanic acid diluted with oil are superior to those of a classical elastomer dissolved in Oil. The proposed method, in comparison with the known, allows to obtain rubber with improved physicomechanical and wear-resistant properties. The invention The method of obtaining rubber by mixing liquid rubber containing functional groups with a reactive chain extender, a filler and a vulcanizing agent followed by vulcanization, is also different from the fact that, in order to improve the physicomechanical properties of rubber, a diene rubber mol. weights of 1000-20000 with a functionality of 1.8-2 at the status of functional groups of the chain extender and functional groups: 1: 1 acacia and before vulcanization are carried out at 20-125 s for 15-30 min to lengthen rubber chains, and vulcanization carried out at 140-200 ° C for 1530 minutes. Sources of information taken into account during the examination 1. Published for the Federal Republic of Germany No. 2233359, cl. 39L9 / 08, 1974.