RVTECH technology for tire retreading industry, recycle the tire waste by normal temperature and pressure...

1. SHIJIAZHUANG RICHWAY RUBBER TECHNOLOGY CO., LTD
Marketing HQ: No.1-322 Shengbo Office Building, No.199 Tiyu North Str.SJZ.
Tel: +86-311-86823617
Fax: +86-311-85363799
Web：www.richway-rubber.com
Email: rvtech@richway-rubber.com
RV rubber recycling chemical in
tire retreated industry
Test requirements：
1. RV rubber recycling chemical
2. Open mill
3. Rubber scraps or rubber powder
Technique process& Advantages：
Put 100PHR rubber waste or rubber powder and 3PHR RV rubber recycling chemical on open mill, milling for
10-15 mins under normal temperature and pressure. Then we get the revived rubber compounds(RVR),RVR can be
cured without any sulphur and accelerator, and RVR can be used singly or replace the raw rubber compounds for
20-70% .
The technique can be used for scorched rubber also, and the formula is 0.5-2:100(RV: scorched rubber)
Property comparison for RVR and normal reclaimed rubber(Applicated for tire
tread)：
A＃- -RVR-Processed by RV Rubber recycling chemical and 40meshes rubber powder
B＃-- Rubber powder, activation rubber powder and fine reclaimed rubber
The conclusion under same mixing proportion:
1. A＃ gains better Vulcanizing performance than B＃；
2. The re-treated tire mixed with A＃ has similar wear-resisting property with the original re-treated tire
formula
Test-From a tire re-treated factory：
Comparison for RV treated off-the-road tire, truck tire tread powder and other kinds of rubber powder, the test
shows, RV revived tire tread materials is better.
1 Test
1.1 Test materials
RV rubber recycling chemical, provide by Hebei RVtech Co.,Ltd
40meshes off-the-road tire tread rubber powder, unvulcanized tire tread rubber, provided by tire re-treated
factory
40meshes truck tire tread powder, 60meshes rubber powder, fine reclaimed rubber and 40meshes activation
rubber powder purchase from the market.
（Formula of the unvulcanized tire tread：NR 100, zinc oxide 4, stearic acid 2.5, anti-aging system
3.5, carbon black 50, softener 4；accelerator 1.2, sulphur 1.8）

2. SHIJIAZHUANG RICHWAY RUBBER TECHNOLOGY CO., LTD
Marketing HQ: No.1-322 Shengbo Office Building, No.199 Tiyu North Str.SJZ.
Tel: +86-311-86823617
Fax: +86-311-85363799
Web：www.richway-rubber.com
Email: rvtech@richway-rubber.com
Roller pitch
0.5mm
Roller pitch
0mm
Roller pitch
0mm
1min 10~12min
13~15min
1.2 Formula of RVR and the technique
RVR formula：
40meshes rubber powder 100
RV rubber recycling chemical -RV-NR 3
Unvulcanized tire rubber treads 10
Production process for RVR( roller temperature under 40-60℃)
1.3 Testing method
The physical property test is according to the national standard.
2 Conclusion discussion
2.1 The influence of RVR property by different kinds of rubber powder
Mix the off -the -road tire tread and truck tire tread into RVR and vulcanize it directly, see the properties from
Sheet 1.
Sheet 1 Different influences of vulcanization property by different kinds of rubber powder
Property
Off-the-road tire tread Truck tire tread
Raw
rubber
RVR revived
rubber
Property
retention%
Raw
rubber
RVR revived
rubber
Property
retention %
Shore A 61 62 101.6 60 60 100
Tensile strength Mpa 29.0 19.1 65.8 22.1 14.2 64.2
300%Stress at definite
elongation Mpa
11.6 12.3 106.0 9.5 10.3 108.4
Elongation at break% 540 370 68.5 510 320 62.7
Note：（1）Formula of the off-the-road tire tread：NR+BR 100，zinc oxide 4，stearic acid 2.5，anti-aging system 3.5，
carbon black 50，softener 4，accelerator 1.2，sulphur 1.8；
Formula of the truck tire tread：NR+BR+SBR 100，zinc oxide 5，stearic acid 2，anti-aging system 3，carbon black 50，
softener 5，accelerator 1，sulphur 2
（2）Vulcanization: 153℃×20 min。
Sheet1. Shows the vulcanization property is different because of the different kinds of rubber powder, better
40meshes
rubber
powder
Rubber recycling
chemical RV-NR
Unvulcanized tire
rubber treads
Sheeting

3. SHIJIAZHUANG RICHWAY RUBBER TECHNOLOGY CO., LTD
Marketing HQ: No.1-322 Shengbo Office Building, No.199 Tiyu North Str.SJZ.
Tel: +86-311-86823617
Fax: +86-311-85363799
Web：www.richway-rubber.com
Email: rvtech@richway-rubber.com
rubber powder gains better vulcanization property. But the vulcanization retention is same, so it shows that RV
rubber recycling chemical has same restore property to the two kinds of rubber powder. RVR can be used to replace
the raw rubber tread compounds, so the cost of sulphur and accelerator was saved.
2.2 Different influences of RVR to the tire tread properties
Separately mix the RVR made from off-the-road tire tread and truck tire tread by 20% into No.1 tire tread
rubber, and get the physical property as sheet 2.
Sheet 2 different vulcanization property from different kinds RVR
Property
1#
Tire tread
RVR mixed with 20% of off-the-road
tire tread
Property
retention%
RVR mixed with 20% of truck tire
tread
Property
retention %
Shore A 61 63 103.0 62 101.6
Tensile strength Mpa 31.3 27.6 88.1 26.9 85.9
300% Stress at
definite elongation
MPa
11.7 11.2 95.7 11.0 94.0
Elongation at
break %
580 530 91.3 520 89.6
Tear strength KN·m
－1
142.7 112.0 78.8 95.6 67.0
Note： （1）1#Tire tread formula：NR 100， zinc oxide 4，stearic acid 2.5，anti-aging system 3.5， carbon black 50，
softener 4，accelerator 1.2，sulphur 1.8； （2）Vulcanization: 153℃×20 min。
Sheet 2 shows, mixed tire tread materials made from different kinds of rubber powder, property retention of the
hardness, stress at definite elongation, elongation at break and tensile strength is same, the tear strength is different,
it is because of the dust inside rubber powder. The test shows, different kinds of rubber powder makes different
kinds of vulcanizing property, but when mixed the off-the-road tire rubber powder and truck tire powder, the
vulcanization property is nearly the same.
2.3 Reclaimed rubber and mixed percentage influence for the tire tread property
Mix the RVR reclaimed rubber made from 40meshes off-the-road tire rubber powder, 40meshes activation
rubber powder, 60meshes rubber powder and fine reclaimed rubber, by 10%,15%,20%,30% and 40%, into No1 tire
tread materials, see the physical vulcanization property from sheet 3
Variety and dosage influence for the tire tread vulcanization property Note: Vulcanization by 153℃×20 min
Property
1#Tir
e
tread
Dosage of RVR %
Dosage of 40meshes activation
rubber powder/%
10 15 20 30 40 10 15 20 30 40

4. SHIJIAZHUANG RICHWAY RUBBER TECHNOLOGY CO., LTD
Marketing HQ: No.1-322 Shengbo Office Building, No.199 Tiyu North Str.SJZ.
Tel: +86-311-86823617
Fax: +86-311-85363799
Web：www.richway-rubber.com
Email: rvtech@richway-rubber.com
Shore A 61 62 62 63 64 63 61 58 60 58 59
Tensile strength Mpa
31.3 28.4 27.6 27.6 26.4 25.7 23.5 22.2 22.0 20.9
17.
9
300%Stressatdefiniteelongation
Mpa
Elongation at break%
11.7 10.2 10.7 11.2 11.3 10.1 10.0 9.3 9.4 8.8 7.3
580 550 530 530 510 510 510 510 520 510 490
Tear strength KN·m
－1
142.7
113.
6
117.
5
112.
0
109.
3
110.
5
111.
0
99.0 84.5 77.1
51.
0
Permanent deformation% 24 16 16 16 16 16 20 20 20 20 20
Wear rate% 100 113 128
Property
1#Tir
e
tread
Dosage of 60 meshes rubber
powder %
Dosage of fine reclaimed
rubber%
10 15 20 30 40 10 15 20 30 40
Shore A 61 62 60 58 58 59 59 59 58 58 58
Tensile strength Mpa
31.3 23.8 22.0 22.5 20.9 19.7 25.4 25.5 24.1 23.2
20.
3
300%Stress at definite elongation
Mpa
Elongation at break%
11.7 10.8 10.0 10.1 9.5 8.6 8.4 7.5 6.8 6.1 5.4
580 500 500 500 480 480 600 600 610 620 640
Tear strength KN·m
－1
142.7 98.5
102.
8
75.6 65.2 46.0
116.
5
118.
7
101.
5
100.
3
97.
9
Permanent deformation % 24 16 16 20 20 28 28 28 28 32 34
Wear rate % 100 127 149
The result shows, vulcanization property retention of RVR mixed rubber is the best.
2.4 Mileage test
Compare the original re-treated tire and the RVR retreated tire for mileage test, and fix them on same car, see
the result from sheet 4 and 5. It shows, RVR retreated tire has better vulcanization property as national standard.
Sheet 4 Vulcanization influence of the 30% RVR mixed reclaimed rubber for retreated tire tread
Property
Original
formula
Reclaimed rubber mixed with 30% RVR National standard
Shore A 64 62 55~65
Tensile strength /Mpa 23.3 20.6 ＞18.7

5. SHIJIAZHUANG RICHWAY RUBBER TECHNOLOGY CO., LTD
Marketing HQ: No.1-322 Shengbo Office Building, No.199 Tiyu North Str.SJZ.
Tel: +86-311-86823617
Fax: +86-311-85363799
Web：www.richway-rubber.com
Email: rvtech@richway-rubber.com
300% Stress at definite elongation Mpa 9.5 8.7 7~10.9
Elongation at break % 550 500 ＞500
Tear strength /KN·m
－1
75 63.8 —
Wear rate（1.61km）/cm3
0.095 0.107 ＜0.2
Note： （1）Retread tire tread formula：NR+SBR 100，zinc oxide 5，stearic acid 2，anti-aging system 3，carbon black
55，accelerator 1，sulphur 2；
（2）Vulcanization: 153℃×20 min
Sheet 5 Mileage test
Project Origin retreated tire formula Test retreated tire formula
Fixing date 2006-03-13 2006-03-13
Beginning Tread depth
mm
13.3 13.3
Data collection date 2006-04-12 2006-04-12
Total running mileage
km
5128 5128
Finished tread depth
mm
12.0 11.7
Unit wear km·mm
－1
3944 3205
Wear rate % 100 81.26
Outlooks No groove gap, no collapse cost block, no rubber
tread layer
No groove gap, no collapse cost block, no rubber
tread layer
Note：Test condition: Tire specification is 9.00—20；Tread pattern mixed；Speed: 40-50km·h
－1
；Pavement behavior: good ；
Tire inflation pressure 0.63Mpa；Rated load 10 t；Actual load 15 t（Overweight 5 t）。
2.5 Economic benefit analysis
Compare from the mixing dosage of RVR, 40 meshes activation rubber powder and fine reclaimed rubber, we
can see from Sheet 3 that, if we need the tire tread tensile strength to be 25Mpa, so we can only mix 10% of 40
meshes activation rubber powder, 15% of fine reclaimed rubber, but RVR 40%. If we take the cost of origin tire
tread rubber for 15500RMB/T, RVR 7000RMB/T, 40meshes activation rubber powder 5000RMB/T, fine reclaimed
rubber 3800RMB/T, RVR mixed tire tread material cost is 2350RMB/T less than 40 meshes activation rubber
powder, and 1645RMB/T than fine reclaimed rubber.
（2）Practical prediction

6. SHIJIAZHUANG RICHWAY RUBBER TECHNOLOGY CO., LTD
Marketing HQ: No.1-322 Shengbo Office Building, No.199 Tiyu North Str.SJZ.
Tel: +86-311-86823617
Fax: +86-311-85363799
Web：www.richway-rubber.com
Email: rvtech@richway-rubber.com
If we take it retreated tire 2500pcs per year, and cost tire tread materials 30T, and the origin tire tread cost
15500RMB/T, so we can save cost 76500RMB/year(without the cost which saved from sulphur and accelerator). So
it shows, RVR is with better economic benefit.
3 Conclusion
1) RV rubber recycling chemical have different kinds of effect on different kinds rubber powder, and the
RVR can be vulcanized directly.
2) Vulcanization property of better quality RVR and worse RVR is nearly same.
3) Vulcanization property of the tire tread mixed with RVR is better than other kinds of rubber powder,
under same mixing dosage.
4) Mileage test shows, it is reasonable to mix 15-40% of RVR into retreated tire tread, the retreated tire
property is fit for the national standard.
5) Using RVR in retreated tire can save much of the cost.
6) Anti-origin resistance can be improved by mixing of RVR.
Contact:
SHIJIAZHUANG RICHWAY RUBBER TECHNOLOGY CO., LTD.
Marketing HQ: No.1-322 Shengbo Office Building, No.199 Tiyu North Str.SJZ.
Tel: +86-311-86823617
Fax: +86-311-85363799
Mob：+86-13930145588
Http://www.richway-rubber.com
Email：rvtech@richway-rubber.com
Skype: richway.rubber