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These six points should be paid attention to when selecting additives for plastic modification

These six points should be paid attention to when selecting additives for plastic modification

2022-01-18

The plastic modification formula seems simple, but there are hidden mysteries, which requires us to be cautious when selecting plastic additives. Today, Qingdao Sainuo polyethylene wax manufacturer will introduce you to the selection of additives from the following six aspects on how to obtain formulas with higher performance, low cost and easy processing.

1. Select additives according to purpose

(1) Improve processing properties: lubricants, release agents, stabilizers, processing aids, thixotropic agents, plasticizers, PVC stabilizers.

(2) Improve mechanical properties: plasticizer, reinforcing filler, toughening agent, impact modifier.

(3) Improve optical properties: pigments, dyes, nucleating agents, fluorescent brighteners.

(4) Improve aging performance: antioxidant, PVC stabilizer, UV absorber, bactericide and mildew inhibitor.

(5) Improve surface properties: antistatic agent, smoothing agent, wear-resistant agent, anti adhesion agent and anti fog agent.

(6) Reduce cost: diluent and filler.

(7) Improve other properties: foaming agent, combustion supporting agent, chemical crosslinking agent, coupling agent, etc.

2. Additives are selective to resin

(1) Red phosphorus flame retardant is effective for PA, PBT and pet; Nitrogen based flame retardants are effective for Oxygenates, such as PA, PBT, pet, etc;

(2) The heat-resistant modification of glass fiber has good effect on crystalline plastics and poor effect on amorphous plastics;

(3) Carbon black filled with conductive plastic has good effect in crystalline resin;

(4) Nucleating agent has good effect on copolymerized polypropylene.

3. Compatibility between additives and resin

(1) The compatibility between the additives and the resin is good, so as to ensure that the additives and the resin are dispersed according to the expected structure, ensure the completion of the design index, ensure the lasting effect within the service life, and resist extraction, migration and precipitation.

(2) In addition to a few additives such as surfactants, good compatibility with resin is the key to give full play to its efficacy and increase the amount of additives. Therefore, we must try to improve or improve its compatibility, such as surface activation treatment with compatibilizer or coupling agent.

4. Shape selection of additives

(1) The reinforcing effect of fibrous additives is good. The degree of fibrosis of additives can be expressed by the aspect ratio. The larger the aspect ratio, the better the reinforcement effect. That's why we add glass fiber from the exhaust hole.

(2) The molten state is better than the powder state to maintain the aspect ratio and reduce the probability of fiber breakage.

(3) Spherical additives have good toughening effect and high brightness. Barium sulfate is a typical spherical additive, so barium sulfate is selected for filling high gloss PP, and barium sulfate can also be used for small-scale rigid toughening.

5. particle size selection of additives

(1) Effect of particle size of additives on mechanical properties: the smaller the particle size, the better the tensile strength and impact strength of filling materials.

(2) Effect of particle size of additives on flame retardant performance: the smaller the particle size of flame retardant, the better the flame retardant effect. For example, the smaller the particle size of hydrated metal oxide and antimony trioxide, the less the addition to achieve the same flame retardant effect.

(3) Influence of additive particle size on color matching: the smaller the particle size of colorant, the higher the coloring power, the stronger the hiding power and the more uniform the color. However, the smaller the particle size of the colorant, the better. There is a limit value, and the limit values for different properties are different. In terms of color power, the limit particle size of azo colorants is 0.1 μ m. The limit particle size of phthalocyanine colorants is 0.05 μ m。 The limit particle size of colorant is 0.05 for covering power μ M or so. 

Effect of particle size of additives on conductivity: taking carbon black as an example, the smaller its particle size is, the easier it is to form a network conductive path to achieve the same conductive effect, and the amount of carbon black added is reduced. However, like colorants, the particle size also has a limit value. If the particle size is too small, it is easy to aggregate and difficult to disperse, and the effect is not good.

6. Amount of additives added

The appropriate amount of additives is not only to improve the appropriate performance of the target resin, but also based on the economic basis of low cost. For different additives, the requirements are different:

(1) For flame retardant, toughening agent, magnetic powder and barrier agent, although the more they are added, the better, the cost should also be verified;

(2) Conductive additives generally form a circuit path;

(3) Antistatic agent, and a charge discharge layer can be formed on the surface;

(4) Coupling agent to form surface coating.

Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer for PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS,Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing. Sainuo rest assured wax, welcome your inquiry!

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