Cemotech Construction Chemicals

Property and effect of Polycarboxylate ether superplasticizer (PCE) as water reducer in concrete

Thu, 21 Sep 2023 18:53:41 -0700

In recent years, with the continuous development of the construction industry and the continuous emergence of high-rise buildings, the demand for concrete is increasing, the strength grade is higher and higher, and the quality requirements are also higher and higher.

Polycarboxylate-based (PCE) superplasticizeris a kind of concrete admixture with high water reduction rate and low slump loss.

It can greatly increase the rheological properties of fresh concrete while improving the compressive strength of hardened concrete and keeping the water consumption unchanged.

It plays a vital role in the workability of fresh concrete and hardened concrete. It also ensures the continuity of engineering construction, greatly shortens the construction period, promotes the development of fluid concrete technology and pumping pouring, and accelerates the development of commercial concrete.

Property and effect of Polycarboxylate ether superplasticizer (PCE) as water reducer in concrete

Polycarboxylate superplasticizer plays four main roles in concrete mixtures: first, in order to improve the pouring performance of concrete, improve the workability of concrete without changing the composition of concrete;

Second: under the given working conditions, reduce the water cement ratio of mixing water and concrete, and improve the strength and durability of concrete;

Third, under the condition of ensuring the pouring performance and strength of concrete, reduce the amount of water and cement, and reduce the factors that cause the initial defects of concrete, such as creep, dry shrinkage, cement hydration heat, etc;

Fourth: the role of polycarboxylate superplasticizer in high-grade concrete is irreplaceable by other admixtures. In concrete above C50 standard, the workability of concrete is difficult to achieve by other admixtures. It is predicted that the improvement of concrete process performance and the breakthrough of concrete...Read More

The Role of RDP and Cellulose Ether in Tile Adhesive

Mon, 11 Sep 2023 22:30:34 -0700

Redispersible Polymer powder(RDP) can Improve the consistency and slipperiness of the system in the wet mixing state. Due to the characteristics of the polymer, the cohesion of the wet mixing material is greatly improved, which contributes greatly to the workability; after drying, it provides adhesion to the smooth and dense surface layer. Relay, improve the interface effect of sand, gravel, and pores. Under the premise of ensuring the amount of addition, it can be enriched into a film at the interface, so that the tile adhesive has a certain flexibility, reduces the elastic modulus, and absorbs the thermal deformation stress to a large extent. In the later stage, in case of water immersion, there will be stresses such as water resistance, buffer temperature, and inconsistent material deformation, so as to improve weather resistance. Hydroxypropyl Methyl Cellulose , which provides good water retention and workability for fresh mortar, especially has a key role in the wetted area. In order to ensure the smooth progress of the hydration reaction, it can prevent the substrate from excessive water absorption and the surface layer from evaporating. Due to its air-entraining property, the bulk density of tile adhesive is reduced, material is saved and the modulus of elasticity of the hardened mortar is reduced.

Tile adhesive Redispersible Polymer powder is a green, environmentally, friendly, building energy-saving, high-quality multi-purpose powder building material, and is an essential and important functional additive for dry-mixed mortar. It can improve the performance of mortar, increase the strength of mortar, increase the bonding strength between mortar and various substrates, improve the flexibility and workability, compressive strength, flexural strength, wear resistance, toughness, and viscosity of mortar. Relay and water retention capacity, constructability. The performance of the tile adhesive Redispersible Polymer powder is relatively strong, and...Read More

Advantages of HPMC in Building Materials and Tile Adhesives

Wed, 06 Sep 2023 01:57:04 -0700

Construction grade hydroxypropyl methyl cellulose (HPMC), as a new type of construction material, is a non-ionic cellulose ether made from natural refined cotton through a series of chemical processing. It is an odorless, tasteless, non-toxic white or slightly yellow powder, which can be dissolved in water to form a transparent viscous solution.

It is used as thickening agent, emulsifier, film-forming agent, binder, dispersant, protective colloid and water retention agent in construction mortar.

Advantages in Construction Materials

1. Dry-mix formulations containing hydroxypropyl methylcellulose are easily mixed with water.

2. Ability to quickly obtain the desired consistency.

3. Such cellulose ethers dissolve quickly and do not agglomerate.

4. Easy to mix with dry powder formulations.

5. Cold water dispersion function.

6. Can effectively suspend solid particles, making the mixture smoother and more uniform.

7. improve lubricity and plasticity, enhance processability, make the product construction more convenient and fast.

8. Enhances water retention and prolongs working time.

9. Helps prevent vertical flow of mortar, cement paste and tiles. Extend the cooling time and improve the working efficiency.

Advantages in Tile Adhesive

1. Improve the bonding strength of tile adhesive.

2. Improve the anti-cracking shrinkage rate and anti-cracking strength of mortar and board sealant.

3. Improve the air content of mortar and greatly reduce the possibility of cracking.

4. Improve the appearance of finished products.

5. Enhance the anti-vertical mobility of tile adhesives.

What is Redispersible Polymer Powder?

Mon, 21 Aug 2023 01:37:01 -0700

Redispersible polymer powder is a type of dry powder material made from polymer emulsions that can be redispersed in water to form a stable emulsion. This product is used in construction and building applications as an admixture in mortar, concrete, and plaster. The powder can be easily added to the wet mixture and forms a strong, flexible, and water-resistant bond when dry.

The polymer used in redispersible polymer powder is typically a vinyl acetate-ethylene copolymer, which is obtained by emulsion polymerization. The polymer particles are stabilized by surfactants and dried into a free-flowing powder form. The surfactants in the powder help to prevent the polymer particles from re-agglomerating and ensure that they can be easily redispersed in water to form a stable emulsion.

Redispersible polymer powder provides several benefits when used as an admixture in building materials. It improves the flexibility, adhesion, and water resistance of the final product, making it ideal for use in applications that require a durable and flexible bond. For example, in mortar and concrete applications, the powder can help to reduce cracking and improve workability, while in plaster applications it can improve the crack resistance and adhesion of the final product.

In addition to its practical applications, redispersible polymer powder is also environmentally friendly. Unlike other admixtures that can release harmful chemicals into the environment, the powder is made from a safe, non-toxic, and biodegradable material. Furthermore, it helps to reduce waste by improving the performance and durability of building materials, which can result in less need for repairs and maintenance over time.

Overall, redispersible polymer powder is a versatile and useful material that can be used in a wide range of building and construction applications. It provides a number of benefits, including improved flexibility, adhesion, and water resistance, as well as...Read More

CEMOTECH attend in World of Concrete 2023

Wed, 16 Aug 2023 00:55:22 -0700

Cemotech attended in World of Concrete Asia in Shanghai, meet with clients from China/ Russia/ South Korea/ Malaysia/ Philippines/ Indonesia/ Saudi Arabia.

What is the Role of Hydroxypropyl Starch Ether in Construction?

Sun, 06 Aug 2023 20:25:06 -0700

1-Binder: One of the main uses of hydroxypropyl starch ether in construction is as a binder. It is added to dry materials, such as cement and gypsum, to increase the strength and durability of the final product. Hydroxypropyl starch ether helps to improve the bonding properties of these materials, making them more resistant to cracking and breaking. It is also used as a binder in the production of plasterboard and other types of wallboard, helping to hold the materials together and improve their structural integrity.

2-Thickener: In addition to its use as a binder, hydroxypropyl starch ether is also used as a thickener in construction materials. It helps to increase the viscosity of liquids, such as adhesives and paint, making them easier to apply and helping them to stick better to surfaces. Hydroxypropyl starch ether is particularly useful in construction adhesives, as it helps to improve the adhesion of the adhesive to different types of surfaces, such as wood, concrete, and metal.

3-Water-retention Agent: Another important role of hydroxypropyl starch ether in construction is as a water-retention agent. It helps to absorb and retain water, which can be useful in various types of construction materials, such as plaster and cement. By retaining water, hydroxypropyl starch ether helps to improve the workability and flowability of these materials, making them easier to apply and shape. It also helps to improve the curing process, as the retained water helps to hydrate the materials and promote proper curing.

4-Improve Strength and Durability: Hydroxypropyl starch ether can also improve their strength and durability. It can help to increase the compressive strength of concrete, which can make it more resistant to cracking and other forms of damage. Hydroxypropyl starch ether can also improve the tensile strength of concrete, which can make it more resistant to tension and bending forces.

Overall, hydroxypropyl starch ether is a useful...Read More

Powder Defoamer

Sun, 30 Jul 2023 17:00:21 -0700

Powder defoamer is made of polysiloxane, special emulsifier and highly active polyether defoamer polymerized by special process for cement and gypsum-based dry-mix mortar mix. It has the characteristics of strong defoaming ability, low dosage, long-lasting foam inhibition, good thermal stability, good fluidity, no side effects and convenient transportation. It has strong defoaming and foam inhibition performance in high temperature and high alkalinity solution.

Powder defoamers are typically used in industrial settings to prevent the formation of foam in liquids. The specific method of use will depend on the type of powder defoamer and the application it is being used in.

1. First, determine the appropriate amount of powder defoamer to use. This will typically be specified by the manufacturer and can be determined by performing a trial run or by consulting with a technical representative.

2. Next, add the powder defoamer to the liquid that requires de-foaming. This can be done by hand or by using a metering device such as a screw feeder or a vibratory feeder.

3. Mix the powder defoamer into the liquid thoroughly. This can be done by hand, using a mechanical mixer, or by circulating the liquid through a piping system. The goal is to ensure that the powder defoamer is evenly distributed throughout the liquid.

4. Monitor the liquid for foam formation. If foam is still present, adjust the amount of powder defoamer or the mixing method as needed. It's important to note that the effectiveness of the defoamer may vary depending on the application and the type of foam being produced.

5. If using a defoamer in a closed system, it is recommended to use a continuous feed system. This ensures that the defoamer is...Read More

What is starch ether? What are the characteristics?

Sun, 23 Jul 2023 17:00:01 -0700

Starch ether is the polysaccharide compound extracted from natural plants, with the same chemical structure and similar properties compared with cellulose ethers. Its basic properties are as follows:

Solubility: dissolve in cold water

Particle size: ≥98% (80 mesh sieve]

Viscosity: 300-800CPS

Moisture: ≤10%

Color: white or light yellow

Used in building mortar, starch ether can significantly increase the consistency of mortar and improve the construction performance and sag resistance of mortar. Starch ether is usually used in conjunction with non-modified and modified cellulose ethers. It is suitable for both neutral and alkaline systems, and compatible with most of the additives in gypsum and cement products, such as surfactants, HPMC, starch and polyvinyl acetate and other water-soluble polymers.

Starch ether is mainly used for hand or machine spraying mortar, tile adhesive mortar, caulking materials and adhesives, and masonry mortar with cement and gypsum as the cementitious materials.

The typical dosage of starch ether in the dry-mixed mortar is 0.01%-0.1%.

Cemotech Construction Chemicals, a company of Celotech Chemical Group, together with Startec Modified Starch, will attending the great exhibition of the World of Concrete 2023 in Shanghai in August.

Welcome to visit us at Booth No.： E3-H25

About Cemotech

Cemotech Chemicals is a well known producer of drymix mortar additives, Cemotechis developing, producing and supplying: Poylcarboxylate based superplasticizers, re-dispersible polymer powder, gypsum retarder, modified starch,calcium foramte, etc.These products are been applied in construction industry everyday all over the world. You may visit Cemotech by www.cemotech.com.

About Startec