PVA glue: composition and scope, characteristics
PVA glue , whose composition was invented back in 1912 in Germany, quickly became popular and is currently used in various fields.
The popularity of the product is due to its versatility and absence of harm to human health, and also because the chemical composition is constantly improving, and will give it new properties.
PVA glue is a mixture of the chemical industry, which has excellent adhesive capabilities.
The decoding is quite simple - the letters will denote the active substance (polyvinyl acetate), which in the composition of 95%. The remaining adhesive formula may look different depending on the type of product.
The composition may include:
- DOS (its decoding is dioetiosebacate).
- Other plasticizers.
- Dibutyl phthalate.
- Tricresyl phosphate.
- Additives for stabilization.
Someone is trying to make PVA glue with their own hands, using recipes based on starch and flour.
In fact, such substances have nothing to do with the base of the adhesive. Polyvinyl acetate can be obtained through the polymerization of vinyl acetate monomer. The finished substance is not allowed to be dissolved in water - it will only swell, and behaves similarly in an oil-type solution. PVA is resistant to temperature extremes, as well as inert to the effects of air, not toxic,
and not yet harmful to humans. According to GOST, glue based on polyvinyl acetate must meet the following requirements:
The properties of the adhesive composition can be changed by adding other substances to its formula. For example, certain PVA building adhesives consist of polyvinyl acetate and plasticizers - chalk, kaolin and talc will help thicken the composition.
To improve water resistance, gasoline is introduced, to improve the elasticity of the glue, it is made with the addition of glycerin, oils, but this will reduce the strength characteristics.
Other additives to the adhesive composition:
Please note that manufacturers of solid PVA adhesives in the form of pencils need to replace polyvinyl acetate with PVP (everything stands for polyvinylpyrrolidone) or combine both components. The specified substance is much thicker, has high adhesive properties.
To learn about the advantages and disadvantages of the product, it is worth considering the properties and characteristics of PVA glue. The composition is very convenient to use, it is easy to apply, and it also does not crack. When it is thick, it can be diluted with water, however, this is not about all types of PVA. How long does the product dry? The drying time will depend on the ambient temperature, the application surface and is from 12 to 24 hours, which is not high for adhesives.
- Does not include harmful substances of the body, and the use of children from the age of three is also destroyed.
- Safe when applied to the skin, and you can also use the product without gloves.
- Not explosive and flammable.
- Resistance to mechanical stress.
- Elastic, pliable, and therefore the glue line will not deteriorate under dynamic load.
- Withstands many freeze and thaw cycles.
- Can be used even in closed rooms due to the absence of unpleasant odors and harmful vapors.
- Has a low flow rate from 0.1 to 0.5 kg per square meter.
- Possesses excellent adhesive properties - up to 550 N / m.
- Does not degrade when exposed to ultraviolet rays.
- Perfectly fill all cracks, cracks, pits and gaps.
- It is sold in different packages by volume.
- Can be used alone or as a base for putty and primer.
- The dried glue does not shrink and does not deform the glued product yet.
It is not difficult to wipe off glue stains from various surfaces, and, despite the solubility only in chemical. substances, and PVA is washed off with plain water. There are also drawbacks to the product, and the glue will not be stored for very long - up to six months or a year, and after such an amount of time, it can be irretrievably spoiled. In the presence of chemical components, the degree of safety may change, and it will be necessary to work with the adhesive composition using personal protective equipment.
Most often, the tool is used for children's creativity.
PVA is very popular in kindergartens, schools, circles, development studios. To work with it, the child does not need special clothes, and stains can be removed even by simply washing the thing in the washing machine. The glue easily bonds paper, thread, cardboard, fabric and more. When mixed with gouache glue, you can paint on the surface of the canvas, because such paint will be stable and will not fade.
Please note that PVA is used for construction work - from gluing wallpaper to installing laminate, parquet and tiles.
The adhesive composition is suitable for impregnating wood to make it water-repellent. When PVA is added in an amount of 5 to 10% to an ordinary cement mortar, the waterproofing ability of the latter will significantly increase, as will the plasticity, and also the adhesion to the base. You can add 0.07 kg of PVA per 10 liters of the main mass to the plaster, which will help to quickly dry the coating, and will also allow the building mixture to better lie on the surface of the walls.
There are several varieties of PVA glue, and its technical characteristics, as well as the scope of application, will depend on a certain form.
The tool will be popular in construction and everyday life, among housewives and schoolchildren, it is only important to choose the right one for all individual cases.
Usually it is recommended to use it instead of wallpaper glue for gluing heavy cloths - vinyl based on non-woven fabric, photo wallpaper, glass cloth, fabric. It will give an excellent degree of adhesion to surfaces such as drywall, concrete, and also brick with plaster. Household adhesive is perfect for working with paper, cardboard, textiles, foam rubber, and you can also carry out decoupage with PVA. Its consistency is moderately thick, it looks like a white-milky liquid, sometimes it has a yellow tint.
The glue is frost resistant, able to withstand freezing down to -40 degrees and after defrosting can retain its original properties. After the expiration date, household glue can pick up in lumps that float in a clear liquid. Most often, this glue is sold in large buckets or jars.
The most popular PVA brands:
Let's consider another type of glue.
This type of glue (PVA-K) is similar to the previous one, and clerical glue is still often used for household needs, usually for children's creativity or crafts. It is available in liquid form in bottles, small cans with a capacity of 50 to 250 grams, and also in the form of a dry glue stick.
To make the pencil glide on paper, manufacturers will add a little glycerin to its composition.
The choice of glue is large, and the most famous adhesives from such companies:
One of the most high-quality adhesives of such a group will be the American Elmers. It is this colored PVA that is used to make "slimes" mixed with sodium tatraborate. It is very simple to make slimes at home - you should combine PVA and sodium tetraborate in equal proportions. In order not to accidentally buy a fake, when buying Elmers glue, you should request a certificate of conformity, and also specify the TN VED code.
This glue is marked MB.
It can adhere various types of materials, and is also used to bond cardboard, wood, leather and glass products. You can glue the composition of linoleum, serpyanka, carpet, and also cover products with gold leaf. The tool is often introduced into the composition of building compounds on a water-dispersion base. The glue is moderately frost-resistant and can withstand temperatures down to -20 degrees. On sale you can find the PVA-MB modification, and it differs from the previous version in its low cost, although the quality is also lower.
It is not worth working with such a tool on other materials, except for fabric, cardboard and paper.
The best brands of multipurpose glue compositions:
- Lacra Extra.
- Tex Universal.
The following description is about superglue.
This product contains special additives that, after drying, make the glue seam very strong.
PVA superglue can be used not only for gluing wallpaper, household needs, but also for repair work in the kitchen and bathroom. It helps to fix damaged areas, glue fallen off elements, replace cement mortar when facing small floor coverings. The composition is resistant to moisture, and is also able to withstand freezing up to -40 degrees, and therefore can be used in unheated rooms, for outdoor work.
And what about building glue?
The instructions for using PVA glue are quite simple. Household adhesives are not resistant to impact moisture, it is better not to use them where the humidity indicators are increased.
For this reason, professionals prefer to use construction adhesives - waterproof compositions in the form of an emulsion, which contains special polymerization particles. Due to the special composition, the level of adhesion to the bases will increase. Dispersion of the adhesive is still being introduced. in the composition of various building primers, mixtures, paints as a plasticizer and thickener. Further, such mixtures are used when laying bricks, installing tiles and pouring a screed.
The type of construction glue is carpentry - it is used on veneer, wood, fiberboard and chipboard , as well as other manufacturers of wood, as well as chip materials.Joinery glue is often called furniture - it is used for the production of furniture and components. The moisture resistance of such products is marked with the letter D and the number from 1 to 4. The color is usually transparent, the viscosity is high. Frost resistance is also high (up to -40 degrees), adhesives are suitable for outdoor work.
The advantages of construction PVA will be low consumption per square meter, UV resistance, high strength, no shrinkage, and fast drying. Here are the best manufacturers in Russia and not only, who produce PVA of such a group as Titan, Contact, Tex, Lakra Lux, Moment.
Sometimes it is necessary to speed up the drying time, because at a cool temperature in the apartment it takes about a day. This happens even with a large area of application, as well as a thick seam.
To start using the product faster, you need to observe the following instructions:
When heating, do not overdo it - if the temperature of the glue joint is more than +110 degrees, PVA begins to collapse.
Posted By: Work Style |08, Nov 2020
Posted By: Work Style |04, Nov 2020
Posted By: Work Style |05, Nov 2020
Posted By: Work Style |05, Nov 2020
Posted By: Work Style |05, Nov 2020