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Additives commonly used in plastic color matching

Additives commonly used in plastic color matching

2021-06-17

The additives commonly used in plastics color matching are dispersant, lubricant, diffusion oil, coupling agent, compatibilizer, etc. Common resin additives include flame retardant, toughener, brightener, anti ultraviolet agent, antioxidant, antibacterial agent, antistatic agent, etc. Among them, the most common fillers used for cost reduction or physical modification, such as light calcium carbonate, heavy calcium carbonate, talc powder, mica, kaolin, silica, titanium dioxide, red mud, fly ash, diatomite, wollastonite, glass beads, barium sulfate, calcium sulfate, and organic fillers, such as wood flour, corn starch and other by-products of agriculture and forestry industry. There are glass fiber, carbon fiber, asbestos fiber, synthetic organic fiber and so on. 

 Lubricant  pe wax has stable index, high melting point, high hardness than oligomers and low weight loss, it can improve the processing performance of products;

It also has good dispersion ability, can replace the medium and high low polymer dispersion force, and solve the dispersion and lubrication capacity.

If the above additives are added to the raw materials of the product, they must be added to the resin raw materials according to the same proportion in the color matching and proofing, so as not to produce color difference in the later production.

1. Dispersant and Lubricant

Dispersant types are: fatty acid polyurea, HYDROXYSTEARATE, polyurethane, oligo soap, etc.

At present, the commonly used dispersant in the industry is lubricant. The dispersing property of the lubricant is very good, and it can also improve the fluidity and demoulding property of the plastic in the molding process.

The lubricant can be divided into internal lubricant and external lubricant. The internal lubricant has certain compatibility with the resin, which can reduce the cohesion between the resin molecular chains, reduce the melt viscosity and improve the fluidity. The external lubricant has poor compatibility with the resin, which adheres to the surface of the molten resin and forms a lubricating molecular layer, thus reducing the friction between the resin and the processing equipment. 

According to the chemical structure, lubricants are mainly divided into the following categories:

(1) Hydrocarbons. Such as paraffin wax, polyethylene wax (pe wax), EVA wax, polypropylene wax (PP wax), micro powder wax, etc.

(2) Fatty acids. Such as stearic acid, hydroxystearic acid.

(3) Fatty acid amides and esters. Such as vinyl bisstearamide (EBS), butyl stearate, oleic acid amide, etc. EBS is suitable for all kinds of thermoplastic and thermosetting plastics, mainly for dispersion and lubrication.

(4) Metal soap. For example, barium stearate, zinc stearate, calcium stearate, cadmium stearate, magnesium stearate, lead stearate, etc. have both thermal stability and lubrication.

 Dispersant EBS has low acid value, sufficient reaction, excellent late heat stability, It has good whiteness, uniform particle size, good brightness dispersion effect, good friction resistance, and meet FDA requirements.

(5) A lubricant that functions as a release. For example, polydimethylsiloxane (methyl silicone oil), Polymethylphenyl siloxane (benzenesilicone oil), polydiethylsiloxane (ethyl silicone oil), etc. In the injection molding process, when dry coloring is used, surface treatment agents such as white mineral oil and diffusion oil are generally added in the mixing process to play the role of adsorption, lubrication, diffusion and demoulding; When mixing colors, proportions should be added to raw materials. First add surface treatment agent and shake well, then add toner and shake well. 

In the selection, the temperature resistance of the dispersant should be determined according to the molding temperature of the plastic raw materials. From the perspective of cost, in principle, the dispersant with medium and low temperature should not be selected. The high temperature dispersant should be resistant to more than 250 ℃. 

2、Coupling agent and compatibilizer

Coupling agent can improve the affinity between pigment and resin. For example, the dispersion of inorganic pigments such as carbon black and titanium white can be improved by coupling agent treatment. When preparing color masterbatch, adding coupling agent and compatibilizer can improve the affinity between the carrier and the resin, make it closely combined, and improve the processing fluidity and dispersion. 

When using modified materials (such as PP + glass fiber) or adding filler masterbatch, adding coupling agent and compatibilizer can enhance the affinity between resin and filler (such as calcium carbonate, glass fiber, etc.) and also increase the fluidity. 

The main types of coupling agents are aluminate coupling agent, silane coupling agent, titanate coupling agent, etc. 

Compatibilizer can improve and increase the compatibility of two different resins when blending. For example, PCL can be used between San and PC. 

3. Other resin modifiers

Other resin modifiers include glass fiber, flame retardant, toughening agent, brightener, UV resistant agent, antioxidant, antibacterial agent and antistatic agent. The filler includes calcium carbonate, talc powder, mica, etc. sometimes various chemical modifications (such as copolymerization, crosslinking, grafting), physical modification (filling, strengthening, blending or adding additives) or directly blending modified materials (such as pp+pe, 1:1 ratio production) are used.

Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer forPE 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!

Website:https://www.sainuowax.com

E-mail:sales@qdsainuo.com


               sales1@qdsainuo.com


Adress:Room 2702,Block B, Suning Building, Jingkou Road, Licang District, Qingdao,China


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