Modified Bentonite – A new type of rubber filler

Describes has modified sexual expansion run soil in Foundation glue natural rubber (NR) and styrene-butadiene rubber (SBR) and the rubber products tire among of application, results indicates that: (1) in NR and SBR in the joined 10 copies modified sexual expansion run soil not effect sulfide glue of mechanical performance; (2) in tire in the joined 5~10 copies modified sexual expansion run soil not only not effect tire semi-finished products of mechanical performance, and improve has rubber and curtain line of viscosity received strength; (3) modification of bentonite with SBR and mixed.

Keywords: modification of bentonite and natural rubber and styrene-butadiene rubber tire filling

Bentonite used as filler in rubber, abroad, especially the former Soviet Union conducted significant research, and had practical application in rubber industry. Our application of bentonite in rubber has also carried out some research, not only in a laboratory the compound of the basis of modified bentonite in small test application, and the tire factory was a batch application, results good.

1 part

1. main material

Modification of bentonite: self-control, its chemical composition: SiO2,60%~70%; A12O3, 10%～20%; Other, 10%~20%; Its main technical indicators are as follows:

灼减，%:　　　　　　　 ≤8

Water extract pH value 7~10

Density/(g ·) ≥ 1.4

Size ≤ 51 μ m ≥ 95%

Raw materials are sold in an industrial or other reagents.

1. small application test basic formula

1.2. 1 NR application formula

N r 100g, zinc oxide 5G, stearic acid 3G, Accelerator DM 0.6g, N330 CB 50g, sulfur 2.5G, modified bentonite variable.

1.2. 2 application of SBR formula

SBR 100g, zinc oxide 3.0g, stearic acid 1.0g, enhancers t BBS 1.0g, n-330 50g carbon black, sulphur-1. 75g, modification of bentonite variable.

1. factory test applications basic formula

1.3. 1 application of adhesive in the tire formula

NR 70g, SBR 30g, sulfur 2.0g, enhancers 0. 9G, carbon black 40g, antioxidant 4.0g, softeners 4.5G, other 8.2G, modified bentonite variable.

1.3. 2 used in tire rubber buffer recipes

NR 90g, SBR 10G, sulfur 2.1g, enhancers 1. 3G, carbon black 45g, antioxidant 3.0g, softeners 5.0g, 8. 0g, modification of bentonite variable.

2 results and discussion

2.1 basis of modified bentonite in rubber in a small test application

2.1.1 modification of bentonite and effect on mechanical properties of NR and SBR vulcanizate

Fill different copies of the modified bentonite with NR and mechanical properties of SBR vulcanizates as shown in table 1.

As can be seen from table 1, NR, bentonite modified by SBR added 10 on integrated mechanical vulcanizate properties have no effect.

2.1. 2 modification of bentonite mixed with styrene-butadiene rubber performance

SBR respectively with the white carbon black, carbon black, along with other auxiliaries of modified bentonite in HA rheometer mixer mixing required to achieve a balance of torque and time as shown in table 2.

As can be seen from table 2, with SBR modified bentonite mixing balanced torque minimum, balancing the shortest time, description of bentonite and modified SBR rubber mixture.

2. the application of modified bentonite in tire factory

2.2. 1 experiment of semi-finished products

We included in the inner rubber of the tire and rubber buffer for 5 and 10 copies of modified bentonite, amplification combined with experiments in laboratory-scale formula and workshop, small scale formula and result reproducibility of experimental formula very well, and mechanical properties as shown in table 3.

As can be seen from table 3, joined in the tire rubber and rubber buffer 5~10 of modified bentonite, rubber compound not scorch time, have no effect on tire mechanical properties of semi-finished products, accounts, dramatically improving bond strength of rubber cord.

2.2.2 finished loading experiment

Of modified bentonite in Huadian tested a tire factory 5 tons, tires according to national standard test method for testing of finished products, endurance test of 79H, carcass intact, reached the national a-class standard. Both tires were also carried out the actual mileage loading tests of finished product, trials are conducted in Huadian city passenger transport company, from August 1996 to August 1997, finished model of fetal 900-20-16PR, the actual loading quantity is 10, models for the expedition, the road surface is mountainous shashilu. Test driving this one-way reach 50,000 public single maximum fare: up to 5. 3 km, minimum fare of 50,000 public., no quality issues, according to GB-516-89, and minimum fare of 2 poor pavement in mountain areas. 50,000 public form, modified bentonite used tires which are feasible.

3 conclusion

(1) add 10 in natural rubber and styrene-butadiene rubber modified bentonite without affecting its Vulcanized synthetic mechanical property.

(2) good machining properties of modified bentonite, mixed with styrene-butadiene rubber

(3) joining of modified bentonite in the tire can significantly improve the adhesion strength of rubber cord, loading test experiment of semi-finished products and finished products that include 5~10 in the tires of modified bentonite is feasible.