Method for recovering polyphenylene sulfide resin from synthetic polyphenylene sulfide resin slurry
A technology for polyphenylene sulfide resin and slurry is applied in the field of polyphenylene sulfide resin products, separation and recovery of polyphenylene sulfide resin, which can solve the problems of high processing cost and high energy consumption, and achieves improved quality and equipment. Low demand, low content effect
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Embodiment 1
[0028] Due to the synthetic polyphenylene sulfide resin and the by-product sodium chloride, as well as the solvents and additives used for synthesis, there are obvious differences in the particle size of a small amount of polyphenylene sulfide oligomers. Salt and oligomer separation. First, preliminary screening: Stir and mix the synthetic polyphenylene sulfide resin slurry evenly, and then filter through a 60-mesh sieve to obtain the above-sieve material and the under-sieve material, and the under-sieve material is separated and filtered to obtain the filtrate and filter cake ;
[0029] The main components of the sieved material after sieving are as follows.
[0030] Table: 1. Components and content of the sieved material after primary sieving
[0031] It can be seen from the above table that the content of by-products is significantly reduced after sieving. However, compared with PPS, the salt content in the sieve material after the primary screening is still relatively h...
Embodiment 2
[0039] In the synthesis process of the polyphenylene sulfide resin of the comparative example, lithium chloride of 5 kg (accounting for 0.5% of the total weight of the slurry) was added as a phase separation agent, and the method in Example 1 was used to separate, and 100 kg was used for sieving. Purpose sieve, after the first, second and third sieves, the components and contents of the sieved materials are as follows:
[0040] Table: 1. Components and content of the sieved material after primary screening
[0041] Table 2: Components and content of sieved material in secondary sieving
[0042] Table 3: Components and contents of the sieved material in three sieves
[0043] The above screened polyphenylene sulfide resin is washed several times, and dried to obtain a PPS resin product. The finished PPS resin contains by-product sodium chloride, solvents and additives for synthesis, and a small amount of polyphenylene sulfide oligomers: 0.09%, 0.06%, 0.03%, and 0.75%.
Embodiment 3
[0045] In the synthesis process of the polyphenylene sulfide resin of the comparative example, 30 kg (3% of the total weight of the slurry) of water was added as a phase separation agent, and the method in Example 1 was used for separation, and 80 mesh sieves were used for sieving , the composition and content of the sieved material after the first, second and third sieves are as follows:
[0046] Table: 1. Components and content of the sieved material after primary screening
[0047] Table 2: Components and content of sieved material in secondary sieving
[0048] Table 3: Components and contents of the sieved material in three sieves
[0049] The above screened polyphenylene sulfide resin is washed several times, and dried to obtain a PPS resin product. The finished PPS resin contains by-product sodium chloride, solvents and additives for synthesis, and the amounts of a small amount of polyphenylene sulfide oligomers are: 0.10%, 0.06%, 0.05%, and 0.79%.
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