The outer protection pipe of the prefabricated directly buried insulation pipe is black with carbon

What is Carbon Black?

Carbon black is a fine powdery quasi-graphite structural substance formed by incomplete combustion of carbon (mainly petroleum derivatives), which is pure black powder or granular in appearance. The tinting strength, fineness and density of the product vary greatly depending on the raw material and production process. Carbon black is insoluble in water; It is acidic and alkaline, and carbon dioxide is produced after combustion.

The main component of carbon black is carbon, which also contains trace amounts of hydrogen, oxygen, sulfur, ash, tar and water.

What is Pigment Carbon Black?

According to 2005 statistics, the global annual output of carbon black is close to 8 million tons, of which more than 90% is rubber carbon black, which is used for rubber reinforcement purposes and automobile tires; Only about 10% is used as a pigment in inks, plastics and coatings, called pigment carbon black, or pigment carbon black.

Consumption of pigment carbon black.

Pigment carbon black, as the most important black pigment, is the third largest selling pigment product after titanium dioxide and iron oxide. The global annual use of pigment carbon black (for coloring and other special purposes, as distinguished from rubber reinforcement uses) is 500,000 tons. It can be seen that there is a clear difference between pigment carbon black and rubber carbon black.

Characteristics of pigment carbon black.

1.The best black pigments.

2.Pretty much the cheapest pigment.

3.It has the best tinting strength and hiding power compared to similar pigments.

4.The most stable pigment: has very good resistance to heat, chemicals and light.

Carbon black technology process (production method).

The global carbon black production process is generally furnace method, contact method (mainly tank method and tankless gas method) and pyrolysis method. We are using the most important and commonly used production processes – furnace and gas.

The so-called furnace method is to inject liquid hydrocarbon raw materials (generally coal tar) into the burning hot air and natural gas in a closed reactor, and decompose by thermal oxidation at high temperatures, and the performance of the carbon black generated can be controlled by quenching flames. A filtration system is then used to separate the resulting pigment carbon black from the gas smoke. The furnace process is characterized by a wide selection of raw materials and a wide variety of properties for the carbon black produced.

The gas method is the non-grooved gas method, which is an improved production process from the groove method. The tank method is a process in which solid hydrocarbons (crude anthracene) or liquid hydrocarbons (anthracene oil) are gasified in a gasifier kettle, mixed with flammable gas (generally natural gas, coke oven gas or water gas) as raw materials, and sent to the fire room by the annular pipe network, burned at high temperature in the nozzle under the channel steel, and collected by the cooling surface of the channel steel to generate carbon black. The non-grooved gas method is an improved process in which the fire room does not have a channel steel cooling surface.

The carbon black yield of the pigment produced by this process is lower than that of the furnace method, but the particle size of the primary particles is smaller, and the performance is better in terms of blackness and tinting strength.

Powdered and granular form of carbon black.

Pigment carbon black has two apparent forms: powdery and granular. The powder is easy to disperse, but the pollution is high, the properties are fluffy, and the fluidity is weak. The granular carbon black dust is small, the volume is smaller, and it is more convenient to transport, but at the same time, the dispersibility is weaker than that of powder.

Carbon. Short-term UV protection, short-term carbon chain hinge.

The black prefabricated direct buried insulation pipe outer protection pipe is a masterbatch called diffuse carbon black added to the polyethylene raw material, which is black after plasticization and extrusion, and the black outer protection pipe has a good effect of environmental cracking resistance. White outer sheath is very rare!

There is no difference between the quality of raw materials and finished products, but the masterbatch is different!

There are also yellow and white are less common to see what customers need.

High-density polyethylene outer sheath, polyurethane foam, prefabricated direct-buried insulation pipe, from the inside to the outside, is divided into three layers.

The first layer: working steel pipe layer, according to the design and customer requirements, seamless pipe (GB8163-87) spiral welded pipe (GB9711-88; SY T5038-92) and longitudinal welded pipe (GB3092-93). After the surface of the steel pipe is treated by the advanced shot blasting and rust removal process, the rust removal grade of the steel pipe can reach the SA2 grade in the GB8923-1988 standard, and the surface roughness can reach R=micron in the standard.

The second layer: polyurethane insulation layer, which is made by injecting rigid polyurethane foam stock solution into the cavity formed between the steel pipe and the outer sheath layer with a high-pressure foaming machine. It is commonly known as the "tube-in-tube foaming process".

Its function is waterproof, but insulation, and the third is to support the weight of the heating network. When the temperature of the conveying medium is: -50 -120, rigid polyurethane foam is selected as the insulation layer.

The third layer: high-density polyethylene protective layer, prefabricated into black (yellow) plastic pipes with a certain wall thickness, which are treated by the corona process and then set aside. Its function is to protect the polyurethane insulation layer from mechanical hard damage, and the second is to prevent corrosion and waterproofing.

Direct buried insulation pipe is suitable for heat below 140 degrees.

water pipelines; The steel outer protection pipe refers to the outermost layer of steel pipe with anti-corrosion layer of the steam directly buried inner insulation pipe (suitable for steam transmission capacity). The steam direct buried insulation pipe is composed of: working steel pipe, insulation layer, reflective layer, air layer, outer protective steel pipe and anti-corrosion layer.

The steel BAI outer protection pipe is used to protect direct burial.

はは of insulation pipes. The directly buried insulation pipe can be roughly divided into three layers from the inside to the outside: the steel pipe, the insulation layer, and the outer protective pipe, and the steel outer protective pipe is the outer protective pipe made of steel, which is commonly known as the outer sleeve pipe. The steel outer protection pipe is the outermost structure of the directly buried insulation pipe, which can effectively protect the insulation pipe and prolong the working cycle.

It depends on the thickness, which is generally about 100 yuan. Directly buried pipe polyurethane is a material with a high strength ratio (material strength to bulk density ratio), as a thermal insulation material, its performance is better than that of foamed polystyrene, rock brocade and other materials, and the ability to resist external forces is also strong. The external wall insulation system of rigid foam polyurethane spraying composite rubber powder polystyrene particles can withstand the collision caused by the normal human body and the handling items, and will not cause damage to the external thermal insulation system when subjected to general collisions.

When installing an air conditioner on it or placing a maintenance facility in the usual way, the surface layer will not crack or perforate.

Installation of Hanpu directly buried prefabricated insulation pipe:

1. Wrap the first layer of insulation material aluminum silicate fiber blanket on the working steel pipe, 2. Add calcium silicate (tile shell) to the aluminum silicate fiber blanket

3. Pour polyurethane foam in the mold.

4. Finally, remove the mold and make FRP insulation pipe polyurethane foam on the FRP pipe winding machine, which has good mechanical properties and thermal insulation properties, and can withstand temperature of 120 under normal circumstances, and can withstand temperature of 180 through modification or combination with other thermal insulation materials.