How to choose a colorant for nylon?

Update:18-06-2021

Summary:

Colorants are divided into two categories: pigments and […]

Colorants are divided into two categories: pigments and dyes, and pigments are divided into inorganic pigments and organic pigments. Since the characteristics of nylon have special requirements for colorants, today we will mainly look at how to choose a colorant for nylon.
1.About nylon

(1) What are the characteristics of nylon?
Nylon has high mechanical strength, high softening point, heat resistance, low friction coefficient, wear resistance, self-lubricity, shock absorption and noise reduction; oil resistance, weak acid resistance, alkali resistance and general solvents; good electrical insulation, Self-extinguishing; non-toxic, odorless, good weather resistance; but poor dyeability.

(2) Main application of nylon
One of the main uses of polyamide is for synthetic fibers. Its most prominent advantage is that it has higher abrasion resistance than all other fibers. Because polyamide is non-toxic, it can be used as a medical suture.
Because polyamide has safety, light weight, excellent mechanical strength, wear resistance, and good corrosion resistance, it is increasingly used to replace metals such as copper and manufactured in machinery, chemical, instrumentation, and automotive industries. Bearings, gears, pump blades and other parts.
In industry, nylon is used in large quantities to make cords, industrial fabrics, cables, conveyor belts, tents, fishing nets, etc.
In the defense industry, it is the first choice for parachutes and other military fabrics.

2.Classification and performance comparison of colorants

Colorant	Organic pigments	Inorganic Pigments	dye
definition	Organic pigments are characterized by the existence of chromophoric groups, which can be excited from the ground state to the excited state by selectively absorbing visible light, thus making the molecules produce complementary tones.	The main ingredient is inorganic pigments. Almost all inorganic pigments are compounds, often complex mixtures	Dyes can absorb and transmit certain wavelengths of light without scattering any kind of light compound. Is transparent
Thermal stability	good	excellent	good
Light stability	good	excellent	good
Tinting strength	high	low	very high
Relative density	low	Bigger	low
Solvent resistance	good	excellent	Poor
Hiding power	good	excellent	/
Color vividness	good	difference	excellent
toxicity	small	Big	/
Chromatographic completeness	complete	incomplete	/
price	high	low	/
Resistance to migration	good	high	bad

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