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PH-induced reversible color-changing plastic bottle as well as preparation method and application thereof

A technology of color-changing plastics and raw materials, which is applied in the direction of analyzing materials through chemical reactions and observing the effects of chemical indicators on materials, etc.

Inactive Publication Date: 2020-09-11
张洪胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Thermochromic, photochromic, electrochromic, and acid-induced chromic materials are widely used in the preparation of various plastic products, but there are few pH-induced chromic plastics in the prior art. Based on this, the present invention prepares a pH-induced reversible color changing plastic

Method used

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  • PH-induced reversible color-changing plastic bottle as well as preparation method and application thereof
  • PH-induced reversible color-changing plastic bottle as well as preparation method and application thereof
  • PH-induced reversible color-changing plastic bottle as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Synthesis of polypropylene macromolecular transfer agents.

[0034] Add 4-cyano-4-(thiobenzoic acid) pentanoic acid (0.93g, 3.35mmol) and 15ml of anhydrous tetrahydrofuran THF into a 50ml branch bottle equipped with a stirring bar, under room temperature, keep stirring, slowly drop Add thionyl chloride SOCl 2 (1.2ml, 16.75mmol), reflux at 70°C for 1.5h, remove SOCl under reduced pressure after finishing the reaction 2 and THF to obtain a yellow oily product Y, which was dissolved by adding an appropriate amount of anhydrous toluene.

[0035] Add single-end hydroxyl polypropylene PP-OH (2g, 0.67mmol) into a branch bottle equipped with a stirrer, under N 2 Under the atmosphere, use a disposable syringe to inject 40ml of anhydrous toluene, heat to 75°C, stir continuously, add 1ml of pyridine after it is completely dissolved, and after stirring for 15min, slowly add the above-mentioned yellow oily product Y dissolved in toluene solution, at 80°C After stirring for 1.5 h,...

Embodiment 2

[0037] Synthesis of pH-sensitive polypropylene diblock copolymers.

[0038] Polypropylene macromolecule transfer agent (0.16g, 0.05mmol), AIBN (1.64mg, 0.01mmol), 2-vinylpyridine (1.51g, 10.0mmol) and 10ml of toluene / DMF (v / v:9 / 1 ) mixed solvents were added to 25ml Schlenk bottles with stirring bars, and after three cycles of liquid nitrogen freezing-pumping-thawing, the polymerization reaction was carried out in an oil bath with a pre-set temperature of 85°C. After the polymer was dissolved, continue After reacting for 1 hour, the Schlenk bottle was immediately taken out and placed in liquid nitrogen to cool. After two cycles of THF / ether dissolution / precipitation, it was dried in vacuum at 40°C to constant weight to obtain 1.18 g of yellow solid powder with a yield of 71%. , that is, pH-sensitive polypropylene diblock copolymer.

Embodiment 3

[0040] Preparation of pH-induced reversible discoloration plastic bottles.

[0041] According to pH sensitive polypropylene diblock copolymer 82 parts, organotin stabilizer 4.0 parts, polyvinyl alcohol 6.0 parts, antioxidant 1.0 parts, zinc stearate 4.0 parts, flame retardant 2.5 parts, other additives 0.5 parts The weight ratio is to weigh the raw materials, stir and mix each component material with a mixer, and dry mix it in a high-speed mixer for 5 minutes to obtain a mixture a, put the mixture a into a twin-screw extruder to extrude and granulate, and the screw extruder The extrusion processing temperature in the machine is controlled at 180°C, the vacuum negative pressure is above 0.6MPA, the preform is extruded, the thickness of the preform is adjusted to be uniform, and the weight is set according to the product standard. Finally, a pH-induced reversible color plastic bottle is formed.

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Abstract

The invention discloses a pH-induced reversible color-changing plastic bottle as well as a preparation method and application thereof. The pH-induced reversible color-changing plastic bottle is prepared from the following raw materials, in parts by mass: 75 to 85 parts of a pH-sensitive polypropylene diblock copolymer, 3.5 to 5.5 parts of an organic tin stabilizer, 5.5 to 8.5 parts of polyvinyl alcohol, 0.8 to 1.5 parts of an antioxidant, 2.5 to 6.5 parts of zinc stearate, 1.5 to 3.5 parts of a flame retardant and 0.2 to 0.5 part of other auxiliary agents. The pH-induced reversible color-changing base material is a pH-sensitive polypropylene diblock copolymer, wherein the pH-induced reversible color-changing plastic bottle prepared from the pH-sensitive polypropylene diblock copolymer hasan obvious color-changing phenomenon when the pH value is 4.5-5, so that the technical problems that the prepared plastic bottle is non-uniform in color, fades when the pH value changes color and cannot be repeatedly are avoided.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a pH-induced reversible discoloration plastic bottle and a preparation method and application thereof. Background technique [0002] Polypropylene, referred to as PP, is a colorless, odorless, non-toxic, translucent solid substance. It is a thermoplastic synthetic resin with excellent performance. It is a colorless and translucent thermoplastic lightweight general-purpose plastic. With chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high wear-resistant processing properties, etc., polypropylene has been rapidly used in machinery, automobiles, electronic appliances, construction, textiles, and packaging since its inception. It has been widely developed and applied in many fields such as agriculture, forestry, fishery and food industry. In recent years, with the rapid development of my country's packaging, elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/00C08L29/04C08K13/02C08K5/098C08K3/22C08K5/20C08K5/57C08F293/00C08F2/38G01N21/80
CPCC08F2/38C08F293/005C08F2438/03C08K2003/2227C08K2201/014C08L53/00G01N21/80C08L29/04C08K13/02C08K5/098C08K3/22C08K3/2279C08K5/20C08K5/57
Inventor 张洪胜
Owner 张洪胜
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