Method for preparing regenerative cationic-dye dyeable polyester with waste-polyester alcoholysis method
A cationic dye and waste polyester technology, which is applied in the direction of single-component polyester rayon, plastic recycling, rayon manufacturing, etc., can solve the problem of large fluctuations in the content of diethylene glycol by-products, poor hue of recycled polyester, Melting point is not easy to control and other problems, to achieve the effect of high-value recycling, stable quality, and stable product quality indicators
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Embodiment 1
[0017] A kind of waste polyester alcoholysis method of the present embodiment prepares the method for regenerated cationic dye dyeable polyester, such as figure 1 As shown, it includes the following steps: 1) pretreatment of waste polyester, directly smashing the clean waste polyester blocks into the feed bin, cutting the clean waste polyester fibers into the feed bin, and waste polyester bottle flakes Sorting, cleaning, impurity removal, crushing, cutting, and then feeding into the silo, and then mixing ingredients for the next process; 2) alcoholysis of waste polyester, the pretreated waste polyester, according to waste polyester (waste polyester) The molar percentage ratio of 1:2 is put into the alcoholysis kettle 1, and the alcoholysis kettle 1 contains ethylene terephthalate and oligomer (mother liquor) (adding in the first additive inlet 8), wherein the addition of ethylene terephthalate and oligomer (mother liquor) accounts for 40% of the total mass percentage of droppi...
Embodiment 2
[0020] As described in Example 1, the difference is: the molar percentage of waste polyester and ethylene glycol is 1:4, and the alcoholysis still contains ethylene terephthalate and oligomers (mother liquor), wherein the The addition amount of ethylene glycol diformate and oligomer (mother liquor) accounted for 30% of the total mass percentage of input waste polyester, the reaction temperature was 200° C., and the reaction time was 4 hours. Add the phosphorous acid stabilizer of 0.2‰ (accounting for the mass percentage of the product obtained); 230° C. of esterification reaction temperature, 1.5 hours of reaction time, add 3% (accounting for the mass percentage of the product obtained) and 8% (accounting for the mass percentage of the product obtained) of SIPA and 8% simultaneously ) PEG, 0.3% (accounting for the mass percent of the obtained product) of DEG, so that the DEG content (accounting for the obtained product mass percent) in the esterified product is 5.0%. The tempe...
Embodiment 3
[0023] As described in Example 1, the difference is: the molar percentage of waste polyester and ethylene glycol is 1:6, and the alcoholysis still contains ethylene terephthalate and oligomers (mother liquor), wherein the The addition amount of ethylene glycol diformate and oligomer (mother liquor) accounted for 20% of the total mass percentage of input waste polyester, the reaction temperature was 190° C., and the reaction time was 2 hours. Add the trimethyl phosphate stabilizer of 0.2‰ (accounting for the mass percent of the product obtained); 220°C of the esterification reaction temperature, 1 hour of reaction time, add 4% (accounting for the mass percent of the product obtained) and 6% (accounting for the product obtained by mass percent) of SIPA and 6% simultaneously mass percent) PEG, 0.2% (accounting for the mass percent of the obtained product) of DEG, so that the DEG content in the esterified product (accounting for the obtained product mass percent) is 5.2%. The temp...
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