Coloring Of Common Polyolefin Plastics PP PE

2021/06/08

Polyolefin plastics, generally refers to PE and PP, is also one of the most widely used plastic raw materials in the world.


Polyethylene PE, the largest plastic variety, accounts for 1/3 of the world’s plastic production. Polyethylene is characterized by translucent, soft, non-toxic, inexpensive, convenient processing. Most commonly used are Low-density polyethylene LDPE and high-density polyethylene HDPE. LDPE soft, HDPE commonly known as hard soft rubber, it is harder than LDPE, poor light transmittance, large crystallinity.

The melting points of HDPE and LDPE are 126-136 °C and 108-125 °C respectively. Both HDPE and LDPE can be recovered, and the recovery rate can reach 100% .

The pigments commonly used in PE coloring are titanium white, iron oxide, yellow lead, ultramarine, cadmium pigments, phthalocyanines, quinacridinones, bisazo, mono-azo, etc. . The pigments which can affect the light fastness of PE are anatase titanium dioxide, chrome green oxide, cobalt blue and ultramarine blue.

Polypropylene, PP, commonly known as “100 fold glue”, has a high bending fatigue life, density only 0.9-0.91 g/cm3, is one of the lighter varieties of plastics. PP non-toxic, tasteless, oily surface luster, round or oval-shaped translucent milky white particles.

PP is a Thermoplastic olefin plastic with a low density and floats in a small amount of water. The minimum melting temperature is 160-175 °C. PP can generally achieve 100% recovery.

The coloring of polyolefins is relatively easy, the commonly used pigments are titanium white, cadmium series pigments, iron red, ultramarine, cobalt blue and other inorganic pigments and organic pigments such as carbon black, bisazo, condensation azo, phthalocyanine, quinacridone, etc. , they don’t usually use dye. The influence of pigments on the heat resistance, light resistance and shrinkage of polyolefin resin should be considered when they are applied in polyolefin. In color matching, containing copper, tin, zinc pigments will affect the PP light resistance, antioxidant performance.
Jinan Ogilvy Chemical, focusing on optical brighteners for plastics and pigments, provides titanium dioxide, optical  brighteners, phthalocyanine blue and ultramarine blue for PE PP plastic brighteners, and provides the best whitening solutions for plastic raw materials and plastic products, saving time and cost, help customers achieve maximum profit.

Jinan Ogilvy Chemical, focusing on optical brighteners and pigments for plastics, provides titanium dioxide, optical brighteners, phthalocyanine blue and ultramarine for PE PP plastic brightening and coloring, and provides the best whitening solutions for plastic raw materials and plastic products, save time and cost to help customers achieve maximum profit.