How to improve the output of polyurethane white material, find the formula and formula principle of

1. Improve the output of polyurethane white material through the following methods:

The temperature resistance of general-purpose PU rigid foam is below 110.

The proportion of two-component raw materials used is a b = 100 100-110 (flame retardant is not included).

When using, the temperature of raw materials is controlled at 25-65, and the ambient temperature is 15 (the temperature is too low and corresponding technical measures should be taken).

Material A is non-toxic and non-corrosive, and some people can cause allergic reactions to the respiratory tract, so they should be worn during construction.

Labor care products, raw materials splashed into the eyes should be immediately washed with water.

2. Polyurethane white material is polyurethane rigid foam combinationPolyether is one of the main raw materials of polyurethane rigid foam, also known as white material, and polymerized MDI is called black and white material. It is suitable for building insulation, cold insulation, solar energy, water heaters, cold storage, constant temperature storage, beer tanks, refrigeration and other occasions that require thermal insulation.

3. Characteristics and scope of use.

The combined polyether uses HCFC-141B blowing agent, because CFC-11 is not used, the ozone layer is destroyed, the global warming coefficient value is very small, and the foaming parameters can be adjusted according to the use environment. It can be used for thermal insulation and cold insulation of refrigerated trucks, storage tanks, pipelines, cold storage, beer fermentation tanks, fresh-keeping barrels, thermal insulation and waterproof of housing buildings, and is also suitable for prefabricated polyurethane sheets, tube shells, curved plates, etc.

You are asking: through the adjustment of the formula of white material to increase the amount of prescription? Or how to increase the amount of white material that has been prepared?

1) If it is a white material that has been prepared, a bottle of beer can be added to a 200kg barrel and stirred evenly. According to the amount of water added in the original recipe, if the amount of water added in the original recipe has been more, first add half a bottle of beer to try, in order to add too much waterproof amount, the bubble hole is coarse, the foam is soft, and the shrinkage. If the amount of water added to the original recipe is small, you can add up to 2 bottles of beer.

Of course, you can also add water, and the effect is better if the beer contains carbon dioxide gas. If you don't know what the recipe is, you can only start with the smallest amount... Of course, there is no way to do this, and it is theoretically not recommended.

2) If you want to ask how to adjust the white material production formula, there are many technical problems and influencing factors involved, and it is difficult to explain in one or two sentences. For example, if you increase the amount of foaming agent, the foam density will be lower and the amount of output will be more. However, if the combination of raw material formula design is not good, the strength of the foam skeleton is low, and the output amount is too large to shrink and crack.

3) In addition, there are also the influence of construction factors, if it is spraying construction, the thickness of one-time spraying, indoor or outdoor, how is the wind speed, temperature, and structural complexity. If it is used for infusion, it also involves the mold temperature and product thickness. In addition, there are requirements for flame retardant grades, reaction speeds, etc.

1. Characteristics of two-component polyurethane:

The modulus is moderate, the elasticity is high, the elongation is large, the aging resistance, low temperature resistance, water resistance, acid and alkali corrosion resistance, and the fatigue resistance are good.

It has strong adhesion to cement, wood, metal, glass, plastic and other building materials.

This product is solvent-free, tar-free, asphalt-free, non-polluting, non-toxic, and can be used for sealing and waterproofing drinking water pools and swimming pools.

The construction process is simple, and only the two components of A and B need to be mixed and stirred evenly according to the specified proportion during construction.

The curing speed is fast, and it can be preferred for projects that require fast construction schedule.

It can be made into various colors and different grades of products according to user requirements.

Adjust the ratio of the two components, and can also be used as an adhesive or waterproof material.

2. Two-component polyurethane composition.

Polyurethane sealant is a two-component reaction curing type, consisting of two components: A and B. Component A is colorless or light yellow viscous polyurethane prepolymer, and component B is a black paste or liquid mixed with curing agent and additives to dehydrate, and can be non-sagging type and self-leveling type according to the use requirements. It is mainly used in various projects such as bridges, basements, swimming pools, reservoirs, dams, tunnels, subways, etc.

Three: two-component polyurethane technical indicators.

Executive standard: JC482-1992

Test items. Performance metrics.

Appearance. Group A.

Colorless or light yellow liquid.

Group B. Black paste or liquid. Probationary period, h

Density. Surface drying time, h

Recovery rate, % low temperature flexibility ( ).

Rheology. Sag (n) type.

2mm tensile adhesion.

Maximum tensile strength, MPa

Maximum elongation, %

Fourth, two-component polyurethane construction method.

Base treatment: use wire brushes, cotton yarn and other tools to clean up the floating slurry skin, dust, etc. of the base layer, if there is oil stains, it needs to be scrubbed with organic solvents, and keep the surface of the base layer dry and clean before embedding.

Packing pad material: The slit cavity is required to be filled with foam desert plastic as the padding material to ensure that the embedding size meets the design requirements.

Embedded two-component polyurethane: by product a:b=1:

After mixing well, add a caulking gun or use a putty knife to fill from the bottom up, or from front to back; The embedding is required to be full, and the formation of bubbles and holes should be prevented as much as possible; After the embedding is completed, the surface should be scraped out with a putty knife and the excess sealing material should be scraped off with a putty knife before the surface of the sealing paste is dry.

For better interface bonding, an appropriate primer can be used.

5. Precautions for the construction of two-component polyurethane.

Applicable period: After the two-component polyurethane A and B components are mixed, the mixture gradually thickens, and it cannot be used after the expiration date. The ambient temperature at the time of use plays a considerable role in the curing of the sealing paste, the higher the temperature, the shorter the application period, and the curing speed slows down when the temperature is too low, and the construction temperature is 5

35 is advisable.

When using, the width and depth ratio of the sealing material should be appropriate.

Two-component polyurethane should be stored in direct sunlight, and should be placed in a cool and dry place, away from fire; Special attention should be paid to the fact that the barrel is well sealed and valid for one year.

There are a lot of these contents in the books, but can you look at this and develop a formula? The polyurethane formula of Tongbo Research Institute is OK, so I have time to learn about it

Good evening, the general formula of PU is rigid foam polyester polyol or flexible foam polyether polyol as the active monomer, the basic synthesis of the latter is tetrahydrofuran catalyzed by hydrochloric acid to generate polytetrahydrofuran ether diol, commonly known as PTMEG, can also be grafted on other functional groups to react with isocyanic acid to obtain better physical properties.

The standard black and white material formulation is toluene diisocyanate curing agent and polyether polyol, which is milky white or light yellow sponge after foaming.

This question is answered by Jinan Yabu-polyurethane black and white material and polyurethane foaming machine: polyurethane white material is composed of 17 components such as polyether polyol or polyester polyol or small molecule polyol, foaming agent, homogenizer, catalyst, flame retardant, polyamine or water and other chain extenders or crosslinking agents.

Polyurethane black and white materials are mixed by special equipment and foamed on site by high-pressure spraying. Polyurethane rigid foam is a new type of synthetic material with thermal insulation and waterproof functions, and its thermal conductivity is low, which is only half of that of extruded plastic board, and is the lowest thermal conductivity among all thermal insulation materials.

This question is answered by Yabu Machinery Polyurethane engineers for you, resulting in the following reasons:

The quality of polyurethane white material is poor and the shelf life is short;

Low external environment will also cause less foaming;

Failure of polyurethane spraying equipment to heat and mix the foam well will also affect the outlet.

Temperature, black and white mixing ratio, raw materials, etc. are all possible, depending on the specific construction site.

The chemical name of polyurethane white material is polyurethane rigid foam combined polyether, which is an indispensable part of the composition of polyurethane rigid foam insulation material, which reacts chemically with isocyanate to form polyurethane rigid foam insulation material.

Polyurethane rigid foam combined polyether, commonly known as polyurethane white material, is composed of 17 components, including polyether monomer, foaming agent, crosslinking agent, catalyst and foaming agent.

Polyurethane rigid foam polymeric MDI, commonly known as polyurethane black material, is composed of 1 component of isocyanate.

The scope of use of polyurethane rigid foam insulation materials: building exterior wall polyurethane foam insulation, roof polyurethane foam insulation and waterproof integration, cold storage polyurethane foam insulation, grain depot and various ceiling polyurethane foam thermal insulation and other fields, as well as solar water heater barrel interlayer insulation layer perfusion filling, thermal insulation water tank, car portable refrigerator, beer barrel, anti-theft door, cabinet, plate, on-site foam packaging, plates, etc. are also inseparable from polyurethane rigid foam.

Polyurethane black and white materials are mixed by polyurethane spraying machine and foamed on site by high-pressure spraying, that is, polyurethane rigid foam. Polyurethane rigid foam is a new type of synthetic material with thermal insulation and waterproof functions, and its thermal conductivity is low, which is only half of that of extruded plastic board, and is the lowest thermal conductivity among all thermal insulation materials.