1. Product characteristics

HLN35 series powdered nitrile rubber is a modifier developed for PVC and other polymer materials. It has excellent compatibility with PVC resin and can improve oil resistance, cold resistance and aging resistance of products. Powdered nitrile rubber has the advantages of high dispersibility, easy handling, and particle refinement.

2. Main brands

HLN35 series products are powdered nitrile rubber with low Mooney viscosity, micro (semi) cross-linking and medium acrylonitrile content prepared by medium temperature polymerization, unique coagulation and powder forming. There are three grades, customers can rely on Choose your own formulation system and product requirements.

HLN35 series powdered nitrile rubber product index

3. Application advantages

1 flexibility
As an elastomer, PNBR forms an "island" structure when blended with PVC, which significantly improves PVC flexibility.
2 oil and solvent resistance
The high amount of -CN groups in PNBR can significantly improve the oil and solvent resistance of PVC.
3 cold resistance
There is no flexible and elastic chain structure in the PVC molecule, so its performance at low temperature is poor. After adding PNBR elastomer, its low temperature resistance is improved.
4 excellent insulation.
When the PVC is used alone, the insulation is not very satisfactory. After adding PNBR, the electrical resistance of the product can be improved.
5 wear resistance
PNBR can significantly improve the wear resistance of PVC and extend the service life of the product.
6 slip resistance
PNBR can significantly improve the slip resistance of PVC. PNBR/PVC is comparable to thermoplastic rubber (TPR) in anti-slip properties.
7 plasticizer durability
Most of the plasticizers used in soft PVC are low-molecular substances. The products are prone to problems such as oil spray and blooming during use. After adding PNBR, the elasticity of the product can be increased and the amount of plasticizer can be reduced. Attract plasticizers and reduce the migration rate of plastics.
8 melt viscosity stability
The melt viscosity of PNBR/PVC is relatively stable over a wide temperature range, relaxing the processing conditions of the product.

4.Application process

The production of PVC products mainly consists of three steps of mixing, plasticizing granulation and forming. The process flow is as shown in the figure:

Note: The recommended addition amount is 5-15% (PNBR/PVC), and the specific addition amount varies depending on the product type and formula design requirements.

4.1 Mixing:
The first step: mixing the polyvinyl chloride resin with other solid additives into a high-speed mixer for 5-10 minutes;
The second step: when the temperature in the high-speed mixer reaches 80 ° C, the liquid plasticizer is added, and the stirring is continued until the temperature reaches 80-120 ° C for 5-10 minutes;
Step 3: Put the mixed material into the cooling mixer. After the temperature is lower than 40 °C, add HLN35 powder nitrile rubber and stir at low speed until it is evenly mixed.

4.2 Plasticizing granulation:
The plasticizing granulation of the mixture is carried out on a conventional PVC thermoplastic processing equipment, and can be granulated by a single screw or twin screw extruder, and the granulation temperature is generally 140 to 180 °C. The speed of the extruder should be determined according to the specific conditions.

4.3 Forming
According to different molding processes, the recommended processing temperatures are as follows:
Extrusion process: 120-170 ° C; injection molding process: 150-190 ° C; calendering process: 150-170 ° C.

5. Safety guidance

1 should be stored in a cool, dry, ventilated room, storage temperature of 5-35 ° C, to prevent exposure, rain or heavy pressure.
2 No special safety measures are required when using, as long as good industrial practices are followed. Prevent dust from forming and keep away from fire.

6. Packaging

Carton packaging, net weight 20kg / box.