The Thermochromic Pigment can can be used for injection molding and extrusion process, also can be used for unsaturated polyester, epoxy resin, organic glass or nylon monomer casting, moulding, curing, production has polychromatic performance of plastic products and handicrafts.
1: Thermochromic Pigment of R series P level is most suitable for injection molding and extrusion:
R series P level color pigment is the most suitable for plastic thermochromic pigment varieties. Its characteristic is: the capsule wall thickness, high strength, heat resistant performance is good, more easy to spread evenly, achromatic color less residual. Levels of R series Z (gm) can also be used for plastic, but in some cases the effect is a bit poor.
2: Scope of application: this product can be used for polyethylene (PE), polypropylene (PP), polystyrene (PS), the AS and ABS, transparent or translucent plastic injection molding, extrusion molding. Also can be mixed with unsaturated polyester, epoxy resin, organic glass or nylon monomer casting, moulding, curing.
3: The dosage: used in injection molding, extrusion processing or casting, moulding, curing, the amount of color pigment for plastic volume of 1.5 3%, usually 0.5% to 0.5%. Thermochromic Pigment and the plastic particles to fully mixture (mixture can use a small amount of white oil). If matching the ordinary paint and thermochromic pigment , the ordinary pigment or dye dosage of approximately 0.5% - 0.5% of color pigment.
4: Color masterbatch: when mass production can add the thermochromic pigment ,first should made the pigment content in polyethylene wax or atactic polypropylene is 10% - 20% of the color masterbatch, and then mixed with plastic particles used. This can make the color pigment dispersed more evenly. The preparation method of the color masterbatch can consult technical data provided by this department.
5: Temperature: processing temperature should be controlled under 190 ℃, the highest do not exceed 230 ℃, and try to reduce the material of the heating time. (high temperature, long heating will damage the paint color performance.)
9.6 :Note:
A: If the thermochromic pigment is used in injection molding and extrusion of plastic should not be used at the same time other filler or ordinary pigment (for example, titanium dioxide, calcium carbonate, barium sulfate, carbon black, etc.), otherwise will be shielding effect.
B: Thermochromic pigment when using in casting, moulding, curing should be first to add color pigment to unsaturated polyester, uniform mixing dispersion in organic glass or nylon monomer, and then joined the initiator or curing agent polymerization or crosslinking reaction, because after a dramatic increase in viscosity, the adding thermochromic pigment particles package will be together, and difficult to spread evenly.In addition, the mixing operation at this time also can make residual plenty of bubbles.
C: Choose carefully crosslinking agent and curing agent, epoxy resin and unsaturated polyester resin crosslinking curing process and the internal sometimes produce powerful contraction stress, causing discoloration pigment microcapsules shell is broken, and other chemicals from entering the internal lose its color paint performance. This kind of situation in the epoxy resin curing is greater than 0.2 mm thick and often occur when using multiple amine curing agent.
D: You can't using the mixer, kneading machine, high-speed mixer, double-screw extruder contour cutting equipment for plastic particles and thermochromic pigment mixing. These devices will be severely damaged protective layer on the surface of the color pigments, lose its color performance. In addition, in the preparation of color masterbatch should avoid color pigments undergo repeated cutting operation.
E: In the formulation of PVC resin should avoid using phosphorus stabilizer and plasticizer, otherwise it will discolor injection molding products have serious residues in the state of achromatic color.
F: Thermochromic pigment products must avoid the intense sunshine and long exposure to the sun's ultraviolet rays.
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