Gypsum plays a very important role in the construction materials industry. Compared to cement, gypsum has unique characteristics.
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A little swelling after hydration, no hollow drums or cracks in the cementitious material.
After curing, a large number of porous structures are formed in the material, which have a respiratory, sound-absorbing and acoustic effect. This regulates the humidity in living and working places and creates a comfortable climate, so gypsum is playing an increasingly important role in interior decoration.
China is rich in natural gypsum resources and its energy consumption per unit is 78% lower than that of cement. Gypsum can be recycled.
Desulphurisation in power plants produces large amounts of gypsum, which also provides a rich source of gypsum.
It is the superior properties of gypsum that are being used more and more widely.
With the rapid development of the construction industry, there is a growing demand for new building materials. Due to the increasing awareness of environmental protection and the increasing efficiency of construction, gelling materials and plaster products have been developed rapidly. The most common plaster products nowadays are gypsum plaster, adhesive plaster, embedded gypsum and tile adhesives.
Gypsum plaster is a high quality plastering material for internal walls and ceilings. After use, the wiped wall surface is smooth and delicate, not powdered, firmly bonded with the substrate, no cracking or peeling phenomenon. And it has a fireproof function.
Adhesive plaster is a new adhesive for construction light boards, which is a sticky material made of gypsum as the base material with a variety of additives. It is suitable for bonding between all kinds of inorganic building wall materials. It is non-toxic, odourless, early, strong, fast curing and firmly bonded and can be used as a support material for building panels and buildings.
These gypsum products have a range of different functions. Gypsum and associated fillers play a role. In addition, the key issue is that the addition of cellulose ether additives plays a leading role. As gypsum can be divided into hard gypsum and hemihydrate gypsum, different types of gypsum have different effects on the performance of the product, so properties such as thickening, water retention and slow setting determine the quality of gypsum building materials.
The common problems in these materials are hollowing cracks and not reaching the initial strength. In order to solve this problem, the compound of the model of celluloses with the retarder can be chosen for use.
In this regard, hydroxy propyl methyl cellulose -cps is generally chosen, and the addition amount is 1.5% &#; 2%. In it, the cellulose plays a main role in water retention, retarding and lubrication. However, in this process, the cellulose ether alone as the retarder cannot reach the effects, and the mixing use with the citric acid retarder will not affect the initial strength. HaShuo can provide more gypsum special grade HPMC.
1. Improves water retention and processability and improves adhesion to substrates.
2. Insensitive to the alkalinity of gypsum, it can quickly penetrate into various gypsum products without lumping.
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3. No negative impact on the porosity of cooked gypsum products, ensuring the breathing performance of gypsum products.
4. Good retarding effect, does not affect the growth of gypsum crystals.
5. Suitable wet adhesion to ensure the bonding ability of the material to the substrate.
6. Greatly improves the construction performance of plaster products, easy to spread, no sticky knife.
The construction industry has experienced massive growth in incorporating new materials to enhance the output and overall performance of construction products. Among such trendy innovations is the gypsum plaster.
However, one of the ingredients that serve as the gypsum plaster&#;s bedrock, particularly in stability and thickening property, is cellulose.
In this article, we&#;ll briefly examine the roles of Hydroxypropyl Methyl Cellulose in the production of gypsum plaster.
Before we dive in, let&#;s quickly integrate you with gypsum plaster and the characteristics of HPMC.
Widely known as hydrous calcium sulfate among chemists, gypsum itself is a water-soluble naturally occurring mineral. It exists freely in nature as crystals and can be located among layers of limestone and shale.
On the other hand, gypsum plaster is produced by heating gypsum at a very minimal temperature to achieve evaporation. The dehydrated gypsum known as Plaster of Paris (POP) is pulverized and heated at about 150&#;. The dry POP powder hardens when you add water to form gypsum plaster. The concentration can be applied over concrete, brick, or block to further strengthen it.
HPMC cellulose exists as white, non-ionic cellulose ether. In its powdery form, it&#;s odorless and tasteless. It&#;s soluble in water and other organic content such as ethanol, propanol, and dichloroethane. However, it is insoluble in acetone, diethyl ether, and anhydrous alcohol.
When in an aqueous solution, HPMC offers high stability, transparency, and surface activity. Heating makes the Hydroxypropyl Methyl Cellulose precipitate for gels due to its thermal gelation properties.
1. High water retention
Cellulose has a high water-holding capacity. This attribute makes it useful to improve resistance, prevent cracking, and enhance gypsum plaster&#;s overall appearance. It also boosts surface uniformity, lubrication, and adhesion when applied to gypsum plaster in putty and other construction works.
2. Thickening property
HPMC is the right material for you if you want to increase the tensile strength of gypsum plaster and other construction material. It acts as an interface agent. That is, it improves gypsum plaster flexural strength and increases bonding strength.
3. Highly stable
HPMC's outstanding film-forming properties and high resistance to degrading enzymes help stabilize gypsum plaster pH and enhance its salt discharge performance.
Others include dispersibility, constructability, and adhesive strength. Also, HPMC has effects on the setting time, pumpability, and workability of gypsum plaster composition. Overall, it enhances construction efficiency and guides against weathering after exposure of building surfaces to water-soluble salts.
All these make HPMC an integral part of the gypsum plaster every construction worker must-have.
To order your cellulose, Michem Chemicals is your one-stop shop for quality HPMC and other construction products.with us today to book a free session with our experts for your construction material needs.
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