Is the oil based polyurethane coating firm at the concrete interface?

Oil-based polyurethane coatings single and double components, in the construction process, will encounter some common problems, now, these situations are summarized, one by one to answer, I hope to help you.

1. The polyurethane waterproof layer appears bubbling or small holes after curing after construction.

Cause analysis: 1. The influence of temperature and humidity. When the polyurethane waterproof coating is cured, when the water vapor encounters high temperature weather, the water evaporates, the volume increases, and the coating layer is lifted up through the gap of the screed layer to form bubbling.

2. The phenomenon of sand and powder of the screed, the fine particles formed at the sand and powder make the waterproof coating film fail to be closely combined with the surface of the screed, which lays a hidden danger for the bubbling phenomenon of the waterproof coating film there.

3. During summer construction, the dust, moisture on the construction surface of the polyurethane waterproof coating and the expansion of the construction surface itself when exposed to heat is a phenomenon.

4. The weather is humid or rainy.

5. The customer added a low boiling point diluent when using it, and the diluent volatilized quickly and was prone to bubbles or small holes.

6. Two-component products: construction should be completed during the opening time, especially in the summer high temperature; Avoid the introduction of a large number of bubbles due to excessive speed stirring; If the ratio is not correct, bubbles will also be generated.

Solution: 1. The coating should be uniform, and it is easy to cause blistering if the part is too thick or too thin.

2. Brush the primer well, which is very important to increase the adhesion of the upper layer and prevent blistering.

3. Before brushing the paint, look at whether there is dust or dew and other pollution on the construction surface, if so, clean it up and then brush the next coating. Don't wait too long between coats of paint.

4. Try to avoid construction during periods that are too hot or too humid.

5. Do not construct in wet or rainy days, wait for the base to dry after rain, and take rainproof measures after construction.

The south side should also be relatively solid, and this farmer's market, Jinjie, and Tianhe City, so I think this question is not the same as outside.

I think it should be relatively reliable for it to be used in this kind of concrete, and the specific should comply with the construction requirements.

The interface of the soil, my husband, is very solid, but it depends on what it does? Because the concrete used in different places is also different.

If the oily polyurethane is coated on the concrete interface, it is very strong, and you can understand that its adhesion is still very strong.

When adding diluent, a small test should be done first. Diluent screening principle: generally choose or buy diluent, be sure to choose a diluent with low moisture content, do not add ethanol and other alcohols, such as 150 solvent oil, butyl acetate, etc., it is strictly forbidden to use alcohol, acid, nitro and other paint thinners, and it is strictly forbidden to contact with water.

Oil-based polyurethane is now very strong and strong at the concrete interface.

Whether the oily polyurethane coating on the interface of concrete is firm or not, this still needs to be looked at specifically, and cannot be generalized.

First, the reference is different.

1. Water-based polyurethane: water source instead of organic solvent for bai

It is a new polyurethane system for dispersing the medium DU, also known as water.

DAO dispersed polyurethane, aqueous polyurethane or water-based polyurethane.

2. Oily polyurethane: a polyurethane system with a thermoplastic linear structure.

Second, the characteristics are different.

1. Water-based polyurethane: water-based polyurethane uses water as the solvent, which has the advantages of no pollution, safe and reliable, excellent mechanical properties, good compatibility, and easy modification.

2. Oily polyurethane: mainly has a thermoplastic linear structure, which has better stability, chemical resistance, resilience and mechanical properties than PVC foam materials, and has smaller compression deformation. Good heat insulation, sound insulation, earthquake resistance and anti-virus performance.

Third, the use is different.

1. Waterborne polyurethane: plywood, food packaging composite plastic film, fabric laminated products, laminated products of various thin materials, such as soft PVC plastic film or laminated products of plastic sheets and other materials (such as wood, fabric, paper, leather, metal).

2. Oily polyurethane: mainly used in construction, automobile, aviation industry, thermal insulation structural materials. Polyurethane elastomer properties are between plastic and rubber, oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, elasticity.

It is mainly used in the footwear industry and the medical industry. Polyurethane can also be used to make adhesives, coatings, synthetic leather, etc.

Are you currently using water-based or oil-based products? Our company specializes in the production of waterborne polyurethane resin, if you have technical questions, you can consult Mr. Tang, 13852843921

Water-based copy polyurethane resin and oil-based polyurethane resin There are many types from the shape The difference between liquids Water-based polyurethane resin is mostly milky white and transparent, and blue light is translucent. Oil-based polyurethane is transparent.

Systematically, waterborne polyurethane is miscible with water. Oil-based polyurethanes are compatible with solvents such as alcohol, ether and ketone solvents.

In terms of application, the application field of waterborne polyurethane is gradually expanding, and oil-based polyurethane is mainly widely used in nitro paint, ink, printing and packaging.

Foshan Sansheng Technology Department!

The water-soluble polyurethane chemical grouting material is pale yellow, and the oil-based polyurethane plugging agent is dark brown. This is the most obvious difference between the two products.

1. The difference in color;

The waterborne polyurethane chemical grouting material is pale yellow, while the oil-based polyurethane plugging material is dark brown. This is the most obvious difference between the two products.

2. Performance differences;

The waterborne polyurethane chemical grouting material has a large water content and a large permeability radius, which is suitable for the plugging and water inflow of the moving water formation, and the consolidation and protection of the shallow soil layer and the surface layer. And because the waterborne polyurethane chemical grouting material has good elasticity, it is most suitable for seepage prevention and leakage plugging of concrete dynamic joints.

Oily polyurethane chemical grouting material is commonly known as "cyanide" in China, and the consolidated body formed by it has high strength and good anti-permeability, which is suitable for reinforcing the foundation and plugging the water of the shelterbelt. At the same time, the oily polyurethane chemical grouting material has little elasticity, so it is more suitable for anti-seepage plugging and reinforcement of concrete static joints.

The proportion of polyurethane coatings is only about 4%, but the engineering application of waterborne polyurethane coatings has maintained a growth rate of nearly 10% in recent years. In general, waterborne polyurethane coatings do not require additional dispersants or emulsifiers, and the molecular size and molecular structure can be adjusted appropriately according to the situation.

Is this modified polyurethane water-based or oil-based?

In household waterproofing, and polyurethane waterproof coating is the two main waterproof materials, many owners do not know how to choose, and some owners ask the difference between water-based materials and oil-based materials, in fact, these two problems have a common point that polymer cement-based waterproof coating is a water-based material and polyurethane waterproof coating is an oil-based material.

First of all, the owner decoration waterproof must consider the cost, in comparison, the polyurethane waterproof coating is higher, and, because the thickness of the waterproof layer of the polyurethane waterproof coating is a little thicker than that of the polymer cement-based waterproof coating, the amount of material is naturally more, therefore, the cost of using polymer cement-based waterproof coating is more economical.

Looking at the performance, the tensile strength of the surface of the waterproof membrane is very low, the impact resistance, puncture and other properties are poor, and the polymer cement-based waterproof coating is generally divided into two types: rigid and flexible, with better impact resistance, so the life of the polymer cement-based waterproof coating will be longer. In terms of construction, polymer cementitious waterproof coatings are also more convenient.

Finally, if you want to use it in the family, it must be an environmentally friendly product, otherwise the waterproof is done, and people's health is threatened. Polyurethane waterproof coating has harmful substances, and will volatilize a strong odor during construction, while oily waterproof coating is insoluble in water and should be dissolved with chemical liquid, which is also the reason why it is not environmentally friendly. Compared with water-based polymer cement-based waterproof coatings, it will not have this hazard, and its properties are close to cement, environmentally friendly and non-toxic.

At present, there are two categories of waterproof materials on the market: one is polyurethane waterproof coating, which is generally made of polyurethane and coal tar as raw materials, and the tar oil and gas it volatilizes is toxic and not easy to remove, so it was banned in 2000.

The polyurethane waterproof coating that is still on sale uses asphalt instead of coal tar as a raw material.

However, when using this kind of paint, it is generally diluted with organic solvents such as toluene and xylene, so it also contains toxicity.

The other type is polymer cement-based waterproof coating, which is composed of a variety of water-based polymer synthetic emulsions and high-quality cement mixed with various additives, and the flexibility of polymer (resin) is integrated with the rigidity of cement, so that it has excellent impermeability and stability.

Its advantages are convenient construction, low comprehensive cost, short construction period, and non-toxic and environmentally friendly.

As a result, polymer cementitious bases have become the protagonists of the waterproofing coatings market.

Oil-based polyurethane waterproof coatings are cost-effective and have better performance. However, it is not water-based, polyurethane waterproof coatings are environmentally friendly.

In terms of weather resistance and waterproof performance, it is still better for oil. However, from the construction point of view, it is more convenient to be water-based.

Water-based polyurethane waterproof coating is the use of water instead of organic solvents to become a dispersed medium. The oily polyurethane waterproof coating uses other organic solutions such as isocyanate and polyether to become the dispersion medium.

2. Differences in use.

Water-based polyurethane waterproof coatings are generally used in the consolidation and protection of hydrodynamic strata, soil layer, and surface layer, which can bring good results. The oil-based polyurethane waterproof coating is usually used in the processing of foundations and the water plugging work of shelterbelts.

3. The difference in the elasticity of the consolidated body.

Water-based polyurethane waterproof coating has good elasticity of the consolidated body, so it can be used in the concrete dynamic joint for anti-seepage and plugging function. The oil-based polyurethane waterproof coating contains relatively small consolidation elasticity, so it is used in the static joints of concrete to play the function of anti-seepage plugging and reinforcement.

The two-component polyurethane waterproof coating is oil-based, and the one-component coating is divided into two types: water-based and oil-based. There is no water-based polyurethane coating for waterproof engineering in China, and there is no inspection standard for water-based polyurethane waterproof coating in China, and there is no such material in the new standard that is being revised. The domestic "waterborne polyurethane waterproof coatings" are all very low water-based emulsified asphalt waterproof coatings.

But don't confuse water-curing polyurethane waterproof coatings, water-curing polyurethane waterproof coatings are the same as other polyurethane waterproof coatings, and the test standard is GBT 19250 "Polyurethane Waterproof Coatings". This has a negative effect on the water resistance of the coating. Therefore, considering the particularity of the function of waterproof coating, under the premise of ensuring the thickening effect of the coating, organic thickeners should be used as little as possible, and more bentonite series inorganic thickeners with good water resistance effect should be used.

It not only plays a thickening role, but also can prevent sinking, anti-sagging, anti-floating color and blooming, and its thickening effect is better than the same amount of alkali swelling acrylic acid and polyurethane thickeners.

Water-based generally refers to one-component polyurethane waterproof coatings, and oil-based refers to two-component polyurethane waterproof coatings; In comparison, the water-based performance is poor, and it is cheaper, and the most important thing is to see the use environment!

Water-based is more environmentally friendly! The others are pretty much the same! See what to use! Provide free professional technical consultation for waterproof leakage repair!

"Jianyu" brand waterproof coating is good, Jianyu waterproof, dripping water!

Waterborne polyurethane is a new polyurethane system that replaces organic solvent with water as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Waterborne polyurethane uses water as solvent, which has the advantages of no pollution, safe and reliable, excellent mechanical properties, good compatibility, and easy modification.

The difference between waterborne polyurethane waterproofing and oily polyurethane waterproofing is: different dispersion media, different uses, and different elasticity of consolidated bodies.

First, the dispersion medium is different.

1. Water-based polyurethane waterproofing: water-based polyurethane waterproofing uses water instead of organic solvent as the dispersion medium.

2. Oily polyurethane waterproofing: oily polyurethane waterproofing uses organic solvents such as isocyanate and polyether as the dispersion medium.

Second, the use is different.

1. Waterborne polyurethane waterproofing: waterborne polyurethane waterproofing is suitable for plugging leakage and water inrush of moving water formations, and consolidating and protecting shallow soil layers and surface layers.

2. Oily polyurethane waterproofing: oily polyurethane waterproofing is suitable for projects that have both reinforcing the foundation and sheltering forest water and plugging leakage.

Third, the elasticity of the consolidated body is different.

1. Water-based polyurethane waterproofing: water-based polyurethane waterproof consolidation body has good elasticity, so it is more suitable for anti-seepage and leakage plugging of concrete dynamic joints.

2. Oily polyurethane waterproofing: oily polyurethane waterproof consolidation body has little elasticity, so it is more suitable for anti-seepage, plugging and reinforcement of concrete static joints.

Water-based polyurethane waterproofing is more toxic than oil-based polyurethane water-repellent tar gas and is not easy to remove.

Introduction to polyurethane waterproof coatings:

Polyurethane waterproof coating is a one-component polyurethane waterproof coating made by mixing and polymerizing isocyanate-containing prepolymers formed by addition polymerization of isocyanate, polyether, etc., with catalysts, anhydrous additives, anhydrous fillers, solvents, etc., and processed by mixing and other processes.

This type of coating is a reaction-curing (moisture-curing) coating, which has the characteristics of high strength, high elongation and good water resistance. Strong adaptability to the deformation of the base layer. Polyurethane waterproof coating is a one-component environmentally friendly waterproof coating with liquid construction, which is based on imported polyurethane prepolymer as the basic ingredient, without additives such as tar and asphalt.

It is a curing of moisture in the air after contact, forming a strong, tough, seamless monolithic film on the surface of the base layer.

Product features: 1) It can be applied directly on various substrates in wet or dry.

2) Strong adhesion to the substrate, the polymer substances in the coating film can penetrate into the micro-slits of the substrate, and the follow-up shape is strong.

3) The coating film has good flexibility, strong adaptability to the expansion or cracking of the base layer, and high tensile strength.

4) Green and environmentally friendly, non-toxic and tasteless, non-polluting the environment, and no harm to personal life.

5) Good weather resistance, no flow at high temperature, no cracking at low temperature, excellent anti-aging performance, oil resistance, wear resistance, ozone resistance, acid and alkali erosion resistance.

6) The coating film is dense, the waterproof layer is complete, there are no cracks, no pinholes, no bubbles, and the water vapor permeability coefficient is small, which has both waterproof and air isolation functions.

Product performance: 1The product has high strength, high elongation, high solid content and strong adhesion.

2.Natural leveling, good extensibility, can overcome the leakage caused by cracking of the base layer.

3.Normal temperature construction, easy operation, non-toxic and harmless, excellent weather resistance, aging resistance.

4.The construction is convenient, which overcomes the shortcomings of the two-component polyurethane waterproof coating that needs to be metered and stirred, and ensures the stable product quality and the waterproof effect of the project.