Methylbenzene, ethylene oxide, silk cloth, aluminum powder, etc., are easy to cause Class D fires

The answer is aluminum powder. These substances can be burned, however, class D fires are fires caused by metals, here only aluminum powder is metal, others, toluene, ethylene oxide, silk cloth are all organic matter.

According to the combustion characteristics of the substance, fires can be divided into seven categories: A, B, C, D, E, F, and K.

Class A fire: refers to a fire of solid matter. This substance tends to be organic in nature and generally produces hot embers when burned. Such as wood, coal, cotton, wool, hemp, paper and other fires.

Category B fires: Liquid fires and fires of meltable solid matter. Such as gasoline, kerosene, diesel, **, methanol, ethanol, asphalt, paraffin and other fires.

Class C fire: refers to a gas fire. Such as gas, natural gas, methane, ethane, propane, hydrogen and other fires.

Category D fire: refers to a metal fire. Such as potassium, sodium, magnesium, aluminum-magnesium alloys, alkyl metals and other fires.

Category E fire: refers to the fire of live objects and precision instruments and other substances.

Category F fire: Fire of cooking objects (such as animal and vegetable fats) in cooking utensils.

Class K fires: Edible oil fires. In general, the average combustion rate of edible oil is greater than that of hydrocarbon oil, and it is difficult to extinguish compared to other types of liquid fires, and it is classified as a separate type of fire because there are many behaviors that are different from hydrocarbon oil fires.

d actually refers to light metals such as: magnesium, titanium, lithium, sodium, rubidium, palladium and so on. Because such substances are light metals and easy to reabsorb oxygen and moisture in the air, they produce oxidized flammable hydrogen and alkane gases, resulting in combustion.

Due to the characteristics of this type of product, it is very difficult to extinguish the general fire extinguishing equipment in the event of a fire, and once the light metal fire occurs, it must not be rescued with water, otherwise a greater disaster will occur. If such a fire occurs, it will be effectively extinguished by professional class D fire extinguishing agent and D fire extinguisher, and in case there is no reserve of this type of fire extinguisher equipment, it can be isolated with sand and soil, covered and let it burn out on its own, so as to prevent further expansion of the disaster.

So it's aluminum powder.

Epoxy resins are insulating, and epoxy resins are used as adhesives and film-forming agents in conductive coatings.

Pure epoxy is insulating and can be added to the dielectric to conduct electricity.

Epoxy resin adhesive contains curing agent, reactive thinner, etc., volatile organic gases will be emitted during use, solvent-based will be more, solvent-free system will be much better.

Pure epoxy resin will not, some resins will volatilize more or less if solvents are added.

Yes, be sure to pay attention to ventilation when using.

It is a group that is formed into a ring and has oxygen atoms on the ring.

Epoxy group: a functional group with a —ch(o)ch- structure. It is characterized by strong reactivity.

Molecular chains grow after ring-opening polymerization or addition reactions with other compounds. After reacting with more than two epoxy groups and multifunctional compounds, a cured product with a cross-linked structure is formed, which is epoxy resin and its cured product. It is a thermosetting resin with a wide range of applications.

1. Due to the existence of the high tension of the ternary ring, the epoxy group can undergo a ring-opening reaction with nucleophiles such as primary amine group, sulfhydryl group or hydroxyl group under mild conditions to form secondary amine, thioether or ether bond respectively.

2. According to the chemical properties, the active hydrogen compounds can be divided into basic compounds (such as primary amines, secondary amines, amides, etc.) and acidic compounds (such as carboxylic acids, phenols, alcohols, etc.). Their active hydrogen atom with the epoxy group produces the following addition reactions.

3. Alkaline compounds react with epoxy groups according to the nucleophilic mechanism, generally speaking, the activity of alkaline is large, such as aliphatic amines and aromatic amines. Acidic compounds react with epoxy groups according to the kinephilic mechanism, and generally speaking, the acidity is large and the activity is large, such as carboxylic acid, phenol and alcohol.

Epoxy resin is a general term for a class of polymers that contain more than two epoxy groups in the molecule. The thermal conductivity of epoxy resin is W mk.

Generally, the thermal conductivity of epoxy resin materials is around the limit.

Epoxy resin is an organic compound that contains two or more epoxy groups in the molecule, and their relative molecular mass is not high except for a few individuals. The molecular structure of epoxy resin is characterized by the presence of active epoxy groups in the molecular chain, which can be located at the end, middle or in a cyclic structure of the molecular chain. Because the molecular structure contains active epoxy groups, they can be cross-linked with various types of curing agents to form insoluble polymers with a three-way network structure.

All polymer compounds containing epoxy groups in their molecular structure are collectively referred to as epoxy resins. The cured epoxy resin has good physical and chemical properties, it has excellent adhesion strength to the surface of metal and non-metallic materials, good dielectric properties, small variable shrinkage, good dimensional stability of products, high hardness, good flexibility, and stability to alkali and most solvents, so it is widely used in various departments of national defense and national economy for pouring, impregnation, laminating materials, adhesives, coatings and other uses.

Traditional epoxy resins are poor conductors of heat, and the thermal conductivity is generally.

What we test in the lab is:

Epoxy resin itself is relatively stable, basically non-toxic and harmless, but whether it is an environmentally friendly material depends on what it is used for, and the definition is different for different purposes. Portals.

The scope of environmental protection is too great!

For example, RoHS, REACH SVHC, etc.

Epoxy base liquid mix ratio (weight ratio, unit g) Material name Epoxy resin Curing agent Toughening agent Diluent Chemical name 6101 Ethylenediamine Dibutyl Acetone Mix Ratio 100 6 7 15 20 Epoxy base solution preparation process: epoxy resin is heated to 60, dibutyl and acetone are added and mixed well, and then ethylenediamine is added and mixed well. The epoxy base solution is used as a solvent here.

During construction, the temperature should not be lower than 15 and not more than 40, the thickness of the epoxy base solution should not exceed 1mm, and the coating base solution should be intervaled for 30min before the glass cloth can be pasted to prevent bubbles. After the construction is completed, it should be covered with a straw bag or black plastic sheet, and it is strictly forbidden to use water for maintenance. When matching, it is necessary to accurately measure with measuring tools; After ethylenediamine is added, it should be applied as soon as possible to prevent epoxy consolidation; When mixing ethylenediamine and acetone, avoid contact with **.

Epoxy mortar is mainly used to plug the cracks of prefabricated components, but it is not helpful for the structure, mainly to prevent water from flowing into the components along the cracks and corroding the steel bars.

According to the ratio given upstairs, it will definitely not be cured under the current temperature conditions, and it needs to be heated to cure. The amount of dibutyl ester is too much, and the amount of ethylenediamine is too little.

Let's try it again for you:

Epoxy E-51: 100

Dibutyl phthalate: 10

Ethylenediamine: 8-10

Epoxy E44 100

Dibutyl ester 15--20

Ethylenediamine 3--8

The critical amount of liquid oxygen is 200 tons.

Identification basis: according to the identification of major hazard sources of hazardous chemicals (GB18218-2009) - oxidizing gases: gases whose hazards belong to 2 2 items of non-flammable and non-toxic gases and whose secondary hazards are 5 categories; The criteria for the identification of major hazards are a method that stipulates the basis and method for identifying major hazards, as well as the method for calculating the critical amount and maximum amount of major hazards.

The criteria for the identification of major hazards stipulate the basis and methods for identifying major hazards, as well as the methods for calculating the critical amount and maximum amount of major hazards.

Reference standards. The following standards contain provisions that are adopted by the parties to the adoption of the latest version of the following standards with the possibility of using the latest version of the following standards.

GB12268-2005 Dangerous Goods List is referenced in this standard and constitutes the provisions of this standard. At the time of standard publication, the versions shown are valid. All standards will be revised to use this standard.