BUTADIENE | ACRYLONITRILERUBBER POWDER

INTRODUCTION

In 1999 Repsol and KUO group joined forces in a global business project focused on the production of synthetic rubber based on solution and the development of new products. The team consists of seven different nation-alities and has three production centers located in Spain, Mexico and China.

Sales offices serve more than 500 clients in 70 different countries. In 2015 during this international expansion strategy Repsol and Kuo Group strength-en their partnership with the incorporation of the Spanish company General Química one of the leading producers of catalysts, specialty chemicals and organic dyes.

As part of the new agreement KUO Group brings to the new JV it’s emulsion business unit, Industrias Negromex who has more than 40 years of expe-rience producing Emulsion Synthetic Rubber and has plants located in Al-tamira, Mexico, and China; the company’s wide range of products serve the tire, industrial, adhesive, footwear, chewing gum and retread segments.

All these businesses will now join forces as Dynasol Group becoming one of the world leaders in the Synthetic Rubber market with revenues estimated to more than 700 million dollars and a production capacity of 510,000 tons per year.

Dynasol group goal is to maintain our position as an international leader in the production of Synthetic Rubber and Rubber Chemicals through fo-cused customer satisfaction, ever-evolving innovation and the care we take regarding the environment in each of our processes.

Achieving these objectives is our management’s top priority. At Dynasol Group we are committed to total quality, teamwork, technological develop-ment, innovation, legal compliance, and the continuous improvement of our quality management system.

Paracril NBR PowderNitrile rubber is a polar elastomer that can be blended with other elastomers and ther-moplastics. The predominant thermoplastic blend with NBR is with PVC. These two poly-mers form a miscible blend which imparts ozone resistance to the NBR and flexibility to the PVC. The “fluxing” of the NBR and PVC is accomplished at high temperatures (150 to 170C).

The NBR acts a high molecular weight plasticizer to replace the normal monomeric plasti-cizer used in PVC compounds. This benefits the oil resistance, fuel resistance, tear strength, abrasion and flex resistance. Since the NBR is not extractable versus the fugitive monomer-ic plasticizer it will remain after heat aging, oil and fuel immersion yielding better aged properties and low temperature performance after aging. The lower level of monomeric plasticizer also reduces cracking of adjacent thermoplastics due to migration of the mono-meric plasticizer to the thermoplastic which swells the plastic causing crazing.

NBR | LINEAR POWDER GRADES

Product %ACN Mooney

MedianParticle

Size(mm)

Hot /Cold

DustingAgent

% DustingAgent

Cross-linked

Special properties / Applications

P3350CC2 32.6 50 1 C CaCO3 / CS 10 N

Linear Paracril 33L50 nitrile powder used as a plastic modifier. Calcium

stearate added for resistance to agglomeration.

P3380CC 32.5 80 1 C CaCO3 12.5 N Linear Paracril BLT M80 nitrile powder used as a plastic modifier.

P3380CC1 32.5 80 1 C CaCO3 / CS 12.5 N

Linear BLT M80 nitrile powder used as a plastic modifier. Calcium

stearate added for resistanceto agglomeration.

P3380CMC 33 80 1 C CaCO3 8.5 N

Linear Paracril 3380 nitrile powder used as a plastic modifier and

thermoset applications.Soluble in Toluene.

C3350P 33 50 6 C PVC 10 NLinear Paracril 3350 nitrile crumb used as a plastic modifier and in

adhesive applications.

C3380CC 33 80 6 C CaCO3 9 N Linear Paracril BLT M80 nitrile crumb used as a plastic modifier.

C3380P 33 80 6 C PVC 10 N Linear Paracril 3380 nitrile crumb used as a plastic modifier.

CV 35.2 67 12 H PVC 10 NParacril CLM nitrile crumb used in

adhesives.Soluble in MEK.

CV80 35.2 80 12 H PVC 10 NParacril C nitrile crumb used in

adhesives.Soluble in MEK.

NBR | CROSSLINKED POWDER GRADES

Product %ACN Mooney

MedianParticle

Size(mm)

Hot /Cold

DustingAgent

% DustingAgent

Cross-linked

Special properties / Applications

SD3811 38 115 0.1 H Talc 9 Y

Spray dried rubber, ideal for phenolic resin modification

and is widely used in friction products. Also suitable for PVC

modification.Highly crosslinked.

SD3811C 38 115 0.1 H CaCO3 9 Y

Spray dried rubber, ideal for phenolic resin modification and

is widely used in frictionproducts. Also suitable for PVC

modification.Highly crosslinked.

P3250XP 32 50 0.6 H PVC 9 YHighly crosslinked nitrile

powder used as plastic modifier and for friction materials.

P3250XC 32 50 0.6 H CaCO3 10 YHighly crosslinked nitrile

powder used as plastic modifier and for friction materials.

P3380XP 33 80 1.0 H PVC 10 YHighly crossliked ground

powder used as plastic modifier and for friction materials.

P7083P 32.5 55 1.0 H PVC 9 - 12 YGround nitrile powder used for PVC modification. Low level of

crosslinking.

P7083XP 32.5 50 0.6 H PVC 9 - 12 YGround nitrile powder used for PVC modification. Low level of

crosslinking.

Benefits of using Paracril Powders

FRICTION PVC RUBBER

• Improve friction coefficient• Good anti-fading properties• Good binding properties• Noise and vibration reduction

• Crosslinked grades improve dimensional stability• Crosslinked grades significantly improve compression set and provide a rubber type feel.• Low temperature flexibility especially after fuel or oil aging• Excellent resistance to fuel and oil• Improved melt strength• Good abrasion resistance

• Short mixing cycles• Excellent resistance to oil fuel and chemicals• Provides the proper form for continuous mixing• Improves dispersion• Reduces solvation time in adhesives

FrictionNBR powder is used in friction products such as brake pads and clutch discs. The NBR for these applications is typically higher acrylonitrile content and viscosity. The particle size is normally smaller (0.1 mm) than that needed for thermoplastics. The Paracril SD3811 (C and T) are specially designed products for this application. The Paracril SD3811 acts as a secondary binder mixed with phenolic resins / fillers and curatives. The NBR acts as a secondary binder that provides a higher coefficient of friction, antifading perfor-mance, and fuel and oil resistance with reduced noise.

Friction Coefficient

Wear percent

Higher is better

Lower is better

0.37

2.18

0.37

2.7

0.37

0.76

0.27

0.67

0.34

0.75

0.36

0.84

0.42

0.67

0.40

0.45

0.45

0.42

1.01

0.43

0.92

0.43

0.38

0.93

0.37

0.76

0.39

0.75

0.39

0.39

Temperature (ºC)

Temperature (ºC)

Paracril SD 3811

Paracril SD 3811

Competitor

Competitor

The formulation used was designed to obtain a friction coefficient over 0.35 and not over 0.45 at normal and high temperature (FF according SAE J866), the average friction coefficient of SD3811

is 0.38 and competitor is 0.40, the difference show that the material meets the specification.

Lower percentage levels represent longer durability of the brake pad the average of the Paracril SD3811 shows 1.17% vs 0.99%.

PVC Modification• Medium viscosity grades are the most common NBR used in PVC modification. Parac-

ril polymers are available in linear and crosslinked grades. Linear grades are used for injection molding and can be used in extrusion and calendaring.

• The crosslinked grades provide dimensional stability that yield extrusion uniformity with a controlled profile after extrusion. Crosslinked NBR has lower die swell than lin-ear grades. The crosslinked grades also improve compression set due the high cross-link density in the NBR.

• Paracril linear and crosslinked grades provide a smooth extrusion surface appear-ance since they have been designed to meet the high demands of automotive extru-sions. Crosslinked grades also improve embossing definition and retention.

Mill Shrink (Crosslink indicator)

Physical Properties, MPa

10P7083XP

10P3250XP

10P3380XP

65P7083P

4.3

14.4P7083P

4.5

15.5P3380XP

4.0

12.6P3380CC

3.8

12.5P3350CC

4.3

18.1P7083XP

4.8

17.7P3250XP

Mill shrink is the best indicator of crosslinking and is used as a primary characterization tool.Lower mill shrink indicates higher crosslink level.

This is also an indicator of how the rubber influences the performance of the PVC compound.P7083P is a low level of crosslinking which also has a higher compression set.

BenefitsThe crosslinked grades tend toward better tensile strength

The modulus of the crosslinked grades is slightly higher than the linear grades

%

M 100, Mpa STRESS, Mpa

Compression Set, %

Volume Change (%)

70

49P7083P

P7083P

54

40P3380XP

P3380XP

74

44P3380CC

P3380CC

79

47P3350CC

P3350CC

56

-13

-13

-14

-13

-10

-10

27

6

5

9

12

12

P7083XP

P7083XP

57

28P3250XP

P3250XP

BenefitsThe higher crosslinked level (lower mill shrink) yields lower compression set at room

temperature and at 70C

ObservationsThe grades using calcium carbonate partitioning agent have higher swell in water

The volume change data in IRM 903 oil are similar

22 HOURS @ 70°C, %

IRM 903 FLUID, % volume change

22 HOURS @ RT, %

WATER, % volume change

Lower is better

Grupo Dynasol. Houston14340 Torrey Chase Boulevard Suite 250

Houston, TX 77014Phone: (281) 874 08 88

Toll Free: 1 877 559 75 68 Fax: (281) 885-17 42

Grupo Dynasol. MadridC/ Titán 15, 9th Floor28046 Madrid, Spain

Phone: (34) 90 010 32 39 Fax: (34) 91 323 83 52

marketing@dynasol.com.mx