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Thermochromic polypropylene composition and its preparation method and use

A technology of polypropylene composition and temperature-sensitive discoloration, which is applied in the field of plastic modification to achieve good heat resistance, excellent long-term heat resistance, and little heat influence

Inactive Publication Date: 2018-03-27
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the temperature-sensitive discoloration in the plastic body

Method used

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  • Thermochromic polypropylene composition and its preparation method and use
  • Thermochromic polypropylene composition and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11

[0031] Preparation of embodiment 1-11 thermochromic microcapsules:

[0032] Addition reaction of formaldehyde and melamine with a molar ratio of 2.5 / 1~3 / 1 at a pH of 7.5~8.5 to obtain a methylol melamine prepolymer, and then disperse the triphenylmethane metal complex at 0.2-1.0 In the sodium dodecylsulfonate aqueous solution with wt% concentration, finally add the methylol melamine prepolymer to the above solution, and adjust the solution to pH 5.5~6.5 to obtain a microcapsule emulsion, react at 80-90°C for 3h , after washing, suction filtration, and drying, obtain thermosensitive color-changing microcapsules; wherein, the mol ratio of formaldehyde and melamine in Example 1-2 is 2.5 / 1, and the mol ratio of formaldehyde and melamine in Example 3-5 is 2.75 / 1 , The mol ratio of formaldehyde and melamine is 3 / 1 among the embodiment 6-11.

[0033] The concentration of the above-mentioned sodium dodecylsulfonate aqueous solution is 0.8wt%, and the product is a thermochromic microc...

Embodiment 1-11 and comparative example 4

[0041] Preparation of the polypropylene composition of embodiment 1-11 and comparative example 4 temperature-sensitive discoloration:

[0042] According to the formula in Table 1, random copolymerized polypropylene resin, antioxidant, light stabilizer, lubricant and thermochromic microcapsules were mixed and then added to a twin-screw extruder for melt kneading. The melt kneading temperature was 170 ~190°C, extruded and granulated to obtain the polypropylene composition, and then injection molded the composition into a color plate for testing its color changing performance.

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Abstract

The invention discloses a thermochromic polypropylene composition. The thermochromic polypropylene composition comprises, by weight, 95-99 parts of polypropylene resin and 0.5-3 parts of thermochromicmicrocapsules. The core of the thermochromic microcapsule is prepared from a triphenylmethane-metal complex and the wall of the thermochromic microcapsule is synthesized from formaldehyde and melamine through polymerization according to a mole ratio of 2.5 / 1 to 3 / 1. The preparation method of the thermochromic microcapsule comprises that formaldehyde and melamine undergo an addition reaction at pHof 7.5-8.5 to produce a methylol melamine prepolymer, a triphenylmethane-metal complex is dispersed in a sodium dodecyl sulfate aqueous solution with a concentration of 0.2-1.0 wt%, the methylol melamine prepolymer is added into the solution, the pH is adjusted to 5.5-6.5 so that a microcapsule emulsion is obtained, the microcapsule emulsion undergoes a reaction at 80-90 DEG C for 3h, and the reaction product is washed, is subjected to suction filtration and is dried so that the thermochromic microcapsule is obtained. The thermochromic polypropylene composition can resist heat in a long termand can be widely used in automobile dashboards, accessory dashboards, seats, door plates, bumpers or stand columns.

Description

technical field [0001] The invention relates to the technical field of plastic modification, in particular to a temperature-sensitive discoloration polypropylene composition and a preparation method and application thereof. Background technique [0002] With the increase of people's individual needs, people hope that the color of automobile parts can change from a static single color to a color-changing effect with the change of the environment. Discoloration usually requires the action of external environmental factors, such as light and heat. The discoloration caused by heat is temperature-sensitive discoloration, which means that when the temperature reaches the characteristic discoloration temperature, the discoloration material will change from one color to another. [0003] At present, temperature-sensitive discoloration is mainly used in the field of coatings and inks, and has not been involved in the plastics industry. CN 102615890A describes a temperature-sensitiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08K9/10C08K5/00
Inventor 雷亮王大中苏娟霞林荣涛孙刚吴国峰杨波罗忠富
Owner KINGFA SCI & TECH CO LTD
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