The main role of vulcanizing agent, the role and use of sulfuric acid

Vulcanizing agents are divided into two categories: inorganic and organic. The former category is sulfur, sulfur monochloride, selenium, tellurium, etc. The latter category includes sulfur-containing accelerators (such as accelerator TMTD), organic peroxides (such as benzoyl peroxide), quinone oxime compounds, polysulfide polymers, ethyl carbamate, maleimide derivatives, etc.

Rubber vulcanizing agents include elemental sulfur, selenium, tellurium, sulfur-containing compounds, peroxides, quinones, amine compounds, resin compounds, metal oxides and isocyanates. The most commonly used are elemental sulfur and sulfur-containing compounds.

The most commonly used are elemental sulfur and sulfur-containing compounds. Its vulcanizing agent is a harmful substance that is harmful to people.

Common industrial sulfur additives such as TMTD and TETD can produce carcinogenic N-nitrosodimethylamine when sulfided.

At present, platinum vulcanizing agent (low vulcanization temperature and fast vulcanization speed) has been used as a vulcanizing agent for silicone rubber in some special products.

Vulcanizing agent is suitable for all kinds of natural rubber and synthetic rubber, according to the need, different vulcanizing agent varieties can be used together.

The uses of sulfur are:

1.It is used to control pests and diseases.

Sulfur is a multi-functional agent, in addition to bactericidal effect, it can also kill mites and insects. It is used to control powdery mildew and leaf mites of various crops, and the effective period can reach about half a month. The use of sulfur suspensions for vegetables is mainly used for the prevention and control of melon powdery mildew, such as cucumbers, melons (melons), pumpkins, etc., and 50% sulfur suspensions are diluted into 200-400 times liquid spray.

Spray once every 10 days or so, generally 2 times for mild onset and 3 times for severe disease.

2.To be a vulcanizing agent for radial tires.

With the development of the transportation industry, radial tires will gradually replace oblique rubber tires. As a result, insoluble sulfur is even more compelling as the main vulcanizing agent in the production of radial tires.

3.Sulfuric acid in batteries or in solution.

Sulfur is important in industry, for example as sulfuric acid in batteries or in solution. Sulfur is used in the manufacture of gunpowder, sulfuric acid, sulfites, pesticides, plastics, enamels, synthetic dyes, rubber vulcanization, bleaching, medicines, paints, sulfur ointments, etc., and is also used as a vulcanizing agent in the rubber industry.

4.Make sulfides.

Sulfuric acid is a major consumer of sulfur, with more than 70% of sulfur in China used in sulfuric acid production. Chemical fertilizer is the largest consumer of sulfuric acid, accounting for more than 70% of the total amount of sulfuric acid, especially phosphate fertilizer consumes the most sulfuric acid, and the increase is also the largest. In addition to being used in chemical fertilizers, sulfuric acid is also used to make more than 90 kinds of chemical products such as phenol and potassium sulfate.

Chemical properties of elemental sulfur:

1. Oxidation, the reaction with metal elements, often oxidizes the metal to a lower valence state. Such as sodium, potassium, silver, etc., react with sulfur to form metal sulfides. It reacts with copper and iron to form cuprous sulfide and ferrous sulfide.

2. Reducible, S reacts with a strong oxidant. Such as reaction with oxygen, reaction with concentrated nitric acid, concentrated sulfuric acid, reaction with chlorine, etc.

3. It not only shows oxidation, but also shows reduction.

The above content reference: Encyclopedia - sulfur.

The role and use of "sulfuric acid": metallurgy and petroleum industry, solving people's food, clothing, housing and transportation, consolidating national defense, atomic energy industry and rocket technology, soil improvement, fertilizer production, daily household use, etc. Sulfuric acid is a relatively common chemical that is highly corrosive and oxidizing.

Sulfuric acid is an inorganic compound with the chemical formula H2SO4, the most important oxygenated acid of sulfur. Pure sulfuric acid is a colorless, oily liquid, when crystallized, usually using its various concentrations of aqueous solutions, using the tower method and contact method. The former is obtained as crude dilute sulfuric acid, with a mass fraction of about 75%, and the latter can obtain concentrated sulfuric acid with a boiling point of 338 and a relative density.

Mainly used in pear, jujube, peach, apple, citrus and grapes and other fruit trees, wheat, beans, alfalfa, flowers and tea trees and other crops, with the ability to penetrate and erode the body cells and pests of the body wall, destroy the physiological activities of the bacteria and pests, can prevent and control a variety of fruit trees rust ticks, pests, nymphs, aphids, shell larvae, can also prevent and control gum disease, brown rot, canker, scab, powdery mildew, anthracnose, coal disease, plum scab, rust, plaster disease, bacterial perforation disease and other diseases, mainly play a protective role.

Before use, the degree of the stock solution must be measured with a Baume hydrometer, and according to the required concentration, the water added and diluted with water are calculated, and the formula for adding water per kilogram of stone sulfur mixture stock solution to the target concentration is the amount of water added (kg) per kilogram of stock solution (stock concentration - target concentration) and target concentration.

The use of stone sulfur mixture is contraindicated.

When using, the temperature should not be lower than 4, or higher than 32, which will affect the efficacy.

Stone sulfur mixture can be used when fruit trees such as peach, apricot, pear, grape, apple, cherry and other fruit trees are dormant, but not during the growth of pear, apricot and grapes, nor can it be used on plum trees (inhibition of flower bud differentiation).

45-60 days before the harvest of citrus and 30 days before the harvest of deciduous fruit trees can not be sprayed with stone sulfur mixture.

Stone sulfur mixture can not be mixed with Bordeaux liquid, pine resin mixture, copper preparation and other pesticides.

The above content refers to Encyclopedia-Stone Sulfur Mixture.

The function of stone sulfur mixture: it can control the pests in the fruit tree, so if the fruit tree is pested, you can spray some stone sulfur mixture, which can effectively remove these pests. Stone sulfur mixture also has the effect of sterilization, because stone sulfur mixture can react with oxygen and carbon dioxide in the air, so that some microorganisms in the air are destroyed to achieve the purpose of sterilization.

Dosage of stone sulfur mixture: When using stone sulfur mixture, some water should be added for dilution, and the formula of water added: water addition = concentration of the original solution Target concentration - 1.

Stone sulfur mixture has a strong insecticidal and bactericidal effect, and the dosage can be calculated according to the formula, which is a relatively cheap pesticide system.

Sulfuric acid is one of the most reactive binary inorganic acids that reacts with many metals. High concentration of sulfuric acid has strong water absorption, can be used as a dehydrating agent, carbonized wood, paper, cotton and linen fabrics and biological skin and other carbohydrate-containing substances. When mixed with water, a large amount of heat energy is also emitted.

It is highly corrosive and oxidizing, so it should be used with caution.

Sulfuric acid is an important industrial raw material, which can be used to make fertilizers, medicines, explosives, pigments, detergents, batteries, etc., and is also widely used in purifying petroleum, metal smelting and dyes and other industries. It is often used as a chemical reagent and can be used as a dehydrating agent and sulfonating agent in organic synthesis.

1 Say what is the main use of sulfuric acid.

2Dip the dumplings and eat.

1. SulfateTM dip the dumplings and eat them, and you will become a zombie on the spot.

The functions and uses of stone sulfur mixture are as follows:

First, the role of stone sulfur mixture.

1. Insecticide. After the stone sulfur mixture is sprayed on the body surface of the pest, the polysulfide can be reduced to a solid sulfur balance source, which blocks the insect's air valve, making the insect unable to breathe and suffocating to death.

2. Sterilization. After the chemical reaction of stone sulfur mixture with oxygen, moisture, sulfur dioxide, etc. in the air, it produces fine sulfur (oxidation sterilization) precipitation and releases a small amount of hydrogen sulfide gas, which can destroy the physiological activities of pathogenic microorganisms, so that their normal physiological activities are out of control and die.

Second, the use of stone sulfur mixture.

1. Stone sulfur mixture can control aphids, red spiders, bacterial perforation, anthracnose, rust, brown spot, black pox and other pests and diseases.

2. The stone sulfur mixture is made by boiling lime and sulfur and water.

3. It is easy to generate free sulfur and calcium sulfate in the air, which needs to be sealed and stored, and the concentration of the liquid medicine should be determined according to the type of crop, growth period and temperature when used.

Stone sulfur mixture is suitable for crops

Stone sulfur mixture is mainly used in apples, citrus pears, peaches, grapes, jujubes and other fruit trees, and can also be used for flowers, alfalfa, beans, wheat, tea trees, etc., mainly used to control leaf mites, rust mites, scale insects and other pests, as well as powdery mildew, rot disease, scab, resin disease and other diseases.