Separation and detection method of sulfur-containing thiazole additives in styrene-butadiene rubber
A technology of styrene-butadiene rubber and a separation method is applied in the field of separation and detection of sulfur-containing thiazole additives in styrene-butadiene rubber, and can solve the problems of dermatitis, difficult to treat skin ulcers, and irritation of skin and mucous membranes.
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[0046] In one embodiment, the preparation method of the sulfonated styrene-butadiene rubber at least comprises the following steps:
[0047] Provide styrene-butadiene rubber;
[0048] Provide sulfonation reagents;
[0049] The styrene-butadiene rubber is contacted with the sulfonating agent to obtain sulfonated styrene-butadiene rubber through a sulfonation process.
[0050] Sulfonation process
[0051] The sulfonation process refers to the introduction of sulfonic acid groups into styrene-butadiene rubber through sulfonating reagents.
[0052] There are many types of sulfonation reagents, and the reaction mechanism is also different. Some are electrophilic reactions, such as sulfuric acid, sulfur trioxide, oleum, etc.; some are nucleophilic reactions, such as sodium sulfite, sodium bisulfite, etc.; some are free radical reactions, such as sulfur dioxide and chlorine, sulfur dioxide and oxygen. Sulfonation on the benzene ring is an electrophilic reaction. First, the ele...
Embodiment 1
[0094] The sample is styrene-butadiene rubber containing 1% 2-mercaptobenzothiazole in mass fraction.
[0095] 1. Weigh 10g of the sample, crush the sample, dissolve the sample in 50mL of chloroform, and stir at room temperature until the styrene-butadiene rubber is completely dissolved to obtain a mixed solution;
[0096] 2. Add the above mixed solution into a three-necked flask with reflux, stirring and temperature control system, control the sulfonation reaction temperature to 0°C, and slowly add 0.50g of chlorosulfonic acid to the system under vigorous stirring, drop After the addition was completed, nitrogen gas was continuously fed into the system, and the sulfonation time was 1 hour to obtain a sulfonated styrene-butadiene rubber solution (the degree of sulfonation of the styrene-butadiene rubber was 20%).
[0097] 3. Add 100mL of water to the sulfonated styrene-butadiene rubber solution. After shaking, add 5g of pyrophosphoric acid to the sulfonated styrene-butadiene r...
Embodiment 2
[0104] The sample is styrene-butadiene rubber containing 1% 2-mercaptobenzothiazole in mass fraction.
[0105] 1. Weigh 10g of the sample, crush the sample, dissolve the sample in 50mL of chloroform, and stir at room temperature until the styrene-butadiene rubber is completely dissolved to obtain a mixed solution;
[0106] 2. Add the above mixed solution into a three-necked flask with reflux, stirring and temperature control system, control the sulfonation reaction temperature to 10°C, and slowly add 0.50g of concentrated sulfuric acid to the system under vigorous stirring, dropwise After completion, nitrogen gas was continuously fed into the system, and the sulfonation time was 4 hours to obtain a sulfonated styrene-butadiene rubber solution (the sulfonation degree of styrene-butadiene rubber was 45%).
[0107] 3. Add 100mL of water to the sulfonated styrene-butadiene rubber solution, after shaking, add 10g pyrophosphoric acid to the sulfonated styrene-butadiene rubber soluti...
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