A kind of use waste PET bottle to prepare UV curing polyurethane acrylate and preparation method thereof

Abstract

The invention discloses a method for preparing UV-cured polyurethane acrylate by using waste PET bottles. The method is as follows: use aromatic or aliphatic diisocyanate and waste PET alcoholyzate to prepare polyurethane prepolymer under the condition of dibutyltin dilaurate; add dibutyltin dilaurate and p-hydroxyanisole dropwise into the reactor And the mixed liquid of acrylate hydroxy ester is subjected to the capping reaction of polyurethane prepolymer to prepare UV curable polyurethane acrylate. The invention recycles waste PET bottles, which not only effectively alleviates the environmental pressure caused by increasing waste PET bottles, but also prepares green and environment-friendly UV curable polyurethane acrylate with good stability.

Description

Technical field[0001]The invention belongs to the technical field of light-curing coatings, and specifically relates to a preparation method of UV-curable polyurethane acrylate from waste PET bottles.Background technique[0002]Polyester (PET) bottles are widely used in the beverage market due to their light weight, good barrier properties, and high strength. Usually these PET beverage bottles are discarded after one use, but PET bottles are difficult to degrade under natural conditions. In order to avoid the serious pollution of waste PET to the environment and increase the utilization rate of non-renewable resources, my country has recycled waste PET beverage bottles. However, compared with developed countries, the recycling rate of waste PET in my country is far from enough, so it is urgent to develop new PET recycling. Craft. PET recycling can be divided into physical recycling method and chemical recycling method. Among them, physical recycling method has the advantages of low in...

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Problems solved by technology

[0004] Chinese patent CN103436145A discloses a method for preparing alkyd resin coatings by alcoholysis of waste PET glycerol, without separating the alcoholysis products, directly transesterifying with vegetable oils, and then reacting with acid anhydrides to prepare alkyd resin coatings. The recycling process is simple and saves time, but the prepared alkyd resin coating is oily and unfavorable to the environment. At the same time, the small molecules in the alcoholysis product will affect the performance of the final paint film

Farahat, M.S. et al. used diethylene glycol to degrade PET, and subsequently used methacryloyl chloride to modify the degraded PET oligomers to obtain UV light-curable resins, but the mechanical properties of the paint film were better after the process used toxic solvents and cured at the same time. But lack of comprehensive performance

Vandana Jamdar et al. used 2-methyl-1,3-propanediol to alcoholyze waste PET bottles and used recycled PET oligomers and methacrylates to prepare UV photocurable resins. Subsequent studies showed that the synthesized UV resins could be used in basic Under the premise of not affecting the performance of the cured paint film, it can replace up to 50% of the commercial epoxy acrylic resin, and the performance of the cured paint film will be significantly reduced after replacing more than 50%

In the second step, when PET oligomers are synthesized into UV curable resins, there are defects such as high reaction temperature (not conducive to double bond stability) and complex process.

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