Product performance and production principle of diphenylthiourea

Diphenyl thiourea (diphenyl thiourea) is also known as accelerator CA, N,N"-diphenyl thiourea, stilbene thiourea, the molecular formula is C ₁₃ H ₁₂ N ₂ S, the molecular weight is 228.
3, and the structural formula is

1.

Product performance

Shiny gray or white powdery crystals; m.
p.
154 ~ 155 ℃ (146 gray powder deg.
] C), relative density 1.
32; was dissolved in tetrahydrofuran , cyclohexanone , alcohol, ether , slightly soluble polyvinyl various plasticized with It is insoluble in water and carbon disulfide ; it is flammable; it tastes bitter; it emits light when rubbed; it is less toxic and non-carcinogenic
.

2.
Production principle

Carbon disulfide and aniline are condensed at 35°C and 0.
05MPa pressure, washed with water and dried to obtain diphenylthiourea
.

3.

Process flow

4.

Technical formula (kg/t)

5.

Main equipment

Pressure-resistant reactor, pickling pot, filter, drying box, storage tank
.

6.
Production process

The reaction can be carried out in a relatively wide temperature range.
When the temperature is lower, a longer reaction time is required
.

At room temperature, add 1% ammonium bicarbonate or ammonia water as a catalyst to the reaction solution prepared with aniline, water, and a slight excess of carbon disulfide

After the condensation is completed, the pressure is released, and the molten condensate is put into a flat plate while it is hot, and allowed to cool naturally and condense into a block
.

After crushing, put it in the pickling pot, wash away alkaline substances with dilute hydrochloric acid, and then wash with water until it is neutral

7.
Laboratory preparation method

Put 186g of aniline and appropriate amount of water into the pressure-resistant reactor, add 6g of sulfur and 6g of Na ₂ CO ₃ , heat to 70-80°C, add 304g of carbon disulfide dropwise, and continue to reflux for 4-6 hours after the addition
.

Then, while hot, pour the reactants into a flat pan and let them cool naturally

8.
Product Standard

9.

Product use

This product is a faster cure rate accelerators, natural latex and neoprene mainly for dairy products, it can also be used for manufacturing curing bladders, tire water, tire rubber, wire and cable, industrial products, shoes and the like
.

It can also be used as a heat stabilizer for emulsion PVC, especially suitable for soft products.
The general dosage is 0.
2% to 0.
5%, which will not color plastic products, but can not prevent products from being discolored by light
.
Can not be used with lead and cadmium stabilizers, otherwise it will cause discoloration of the product
.
Diphenylthiourea is also an intermediate of medicines and dyes, used in the production of indigo, methyl indigo, sulfur dyes, flotation agents, and acid inhibitors
.

10.
Security measures

(1) toxicity the LD ₅₀ of 2000mg / kg (rat oral administration)
.
This product has low toxicity, but the raw material aniline is highly toxic, and the production equipment must be sealed
.
Note that diphenylthiourea above 160°C will produce phenyl mustard oil which is strongly irritating to eyes, mucous membranes and skin
.

(2) Pack in cardboard drum lined with plastic bag, pay attention to fire, moisture and sun protection
.