Yi Shimei STA 150D / TA250D / STA350D Artificial stone thin layer series adhesive is a two-component material designed for different materials and climates. It is a cement-based polymer modified cement.

The product consists of a dry powder (Part A) and a liquid curing agent (Part B). The combination of the two will greatly improve the adhesion of the glue, weather resistance, etc., and prevent the stone from being bent and deformed.

Types of:

Universal type: STA150D

Professional: STA250D

Flexible type: STA350D

color: White

Packing: powder 20kg + curing agent 5kg

What is the problem caused by incorrect use of the adhesive?

Artificial stone application typical problem

Artificial stone falls off in large areas and must be re-paved

Artificial stone cracking

Artificial stone drum kit

Artificial stone wing deformation

Artificial stone application problem induction

◇ Typical problem

◇ Empty drum and large area shedding

◇ Artificial stone cracking

◇ Artificial stone drum kit

◇ Artificial stone bending deformation

Analysis of the causes of artificial stone application problems

There are various application problems in artificial stone. The main reason is:

Reasons related to artificial stone itself

Most artificial stone contains unsaturated polyester resin, which will swell when it is exposed to water or moisture for a long time. As a result, artificial stone will be more deformed and winged.

The resin used in the artificial stone production process takes a long time to react thoroughly. If the stone is not in place for maintenance, it will be subjected to post-cutting processing, etc., which will cause deformation and cracking of the stone after application.

If the filler with poor water and heat stability is used in the artificial stone, it may cause problems such as cracking, falling off, and bulging during the application.

Reasons related to the installation process

Artificial stone paving is carried out using conventional cement mortar or resisting adhesive.

The effects of water and heat, which may exist in the actual project, may be considered on the artificial stone.

In order to save costs on one side, the incorrect installation method is selected; or the installation process is not standardized.

The construction process cannot be controlled.

Only artificial stone manufacturers and professional binders and other material manufacturers can effectively promote the use of artificial stone more safely.

Bonding system and mechanism of Yi Shimei artificial stone

When cement mortar is used for bonding, there are two distinct mechanisms of action:

Mechanical fixing and anchoring:

Inorganic binders such as cement are the key to forming mechanical forces. When the cement mortar penetrates into the small holes and potholes of the porous stone, the ceramic brick or the stone brick, and penetrates into the porous substrate, the brick and the substrate can be made to have a fastening effect.

Physical fixation:

The physical interaction or contact of the organic polymer binder between the artificial stone/mortar and the substrate/mortar interface (such as reactive resins and thermoplastic dispersions, which can be bonded by gravitation and chemical bonding), resulting in artificial Stone and substrate produce the main cause of durability bonding.

Mechanism and harm of empty drum

When the cement mortar is used for the tile paste, after the cement mortar has been hardened, the hydration reaction of the cement material is still carried out for a long time, which causes the internal stress of the material to increase, resulting in the shrinkage of the cement mortar. In many cases, even if the paste is in good condition at the beginning of the construction, there may be a partial empty drum (see Figure 1), which will cause the tiles to fall off.

Limitations of empty drum inspection

It is necessary to use the cement mortar to paste the tile and perform the empty drum test after the cement mortar is basically hardened (28 days). However, even if the 28-day inspection is qualified, it may be affected by various factors (such as interface characteristics and processing conditions, mortar water-cement ratio, water-sand ratio, curing conditions, freeze-thaw conditions, etc.), and defects may occur over time.

Shrinkage of cement-based mortar

Effects due to physical (dry) and chemical (or spontaneous) shrinkage

Deformation and shear stress between ceramic tile and substrate using flexible and rigid adhesives

If ordinary cement mortar is used to fix artificial stone, even if it is caused by heat or mechanical-dynamic stress (load, deformation), it will cause a small shear force, which may lead to joint failure.

Yi Shimei thin layer adhesive tile and other materials and base surface are firmly glued together to achieve the advantages of material saving, labor saving, time saving, waterproof and weather resistance. Its various performance indicators meet the JC/T547-2005 "Ceramic Wall Floor Tile Binder" standard requirements.

The artificial stone binder meets the technical requirements of the C1 category in the JC/T547-2005 standard:

The main considerations for the installation of artificial stone--based on the premise that the quality of artificial stone products is stable and reliable

Specific characteristics of artificial stone that should be considered:

Possible effects of water: artificial stone water sensitivity is different

Water sensitivity of commonly used binders for artificial stone

◇ Unsaturated polyester resin: The solidification volume shrinks greatly (7.9%), and the ester bond is hydrolyzed in the alkaline environment of cement mortar.

◇ PMMA: Good water resistance.

◇ Polyvinyl acetate: poor water resistance and heat resistance.

◇ ABS resin: good water resistance

◇ Abundance of aggregates commonly used in stone making:

◇ Marble 0.09-1.31%; quartz sand 0.5-0.22%; calcite 0.04%-1. 4%

◇ Artificial stone water absorption rate: 0.027%

Possible effects of water: external water sources such as the base

◇ Study possible sources of water on the base.

◇ Perform some moisture release tests before installation.

◇ When necessary, install a waterproof membrane to provide a base surface that meets the requirements.

◇ Learn about the performance of the mounting adhesive.

◇  Is there a reliable installation specification reference?

Possible effects of heat

◇ Artificial stone expansion coefficient: 46.8x10'6/°C

◇ Concrete: 10×10'6/°C

◇ Marble: 10.5-13.7×10'6/°C

◇ Quartz: 5.4 × 10'6 / ° C (quartz glass)

◇ Some stones have a thermal expansion coefficient of 3-5 times that of concrete.

◇ The coefficient of thermal expansion of unsaturated polyester resin is (130-150)×10'6/°C

◇ PMMA has a thermal expansion coefficient of 85×10'6/°C

◇ Polystyrene thermal expansion coefficient 80 xl 0'6/°C

◇ Study possible sources of heat (indoor, outdoor)

◇ Investigate if you will be exposed to sunlight.

◇ If possible, perform some basic thermal expansion calculations.

Selection of Yi Shimei adhesive and finishing materials:

The influence of the volume change of the facing brick on the bonding effect: the change of the ambient temperature and humidity will cause a certain volume effect of the facing brick, the water absorption rate, the swelling ratio and the linear expansion ratio of various texture facing materials. 1) shown.

Comparison of water absorption, swelling ratio and linear expansion ratio of various decorative materials: (Table 1)

Visible from (Table 1):

1. There are certain linear expansion ratios of the facing bricks, that is, there is thermal expansion and contraction, but the change of the general temperature has little effect on the linear expansion rate.

2. The veneer with a water absorption of more than 0.5% has a swelling phenomenon. Generally, when the vulcanization rate of the facing brick is more than 0.06%, it is easy to fall off the drum if it is used in a wet place.

Artificial stone:

Artificial stone can be selected according to the material (quartz stone / granite) and (water absorption / hardness and temperature environment) -Easy products STA250D (professional), ST350D (flexible) white two-component artificial stone special binder;

The artificial stone paved can be sag resistant, the general type adopts STA250D paving, and the area with large temperature difference can adopt STA350D to achieve better effect;

For construction methods, please refer to the construction instructions for bonding and caulking.

Features:

◇ Simple construction and improved work efficiency;

◇ Use thin layer paste, the thickness is less than 5mm and the amount is less and uniform, avoiding the appearance of empty drum, which is safer and firmer than traditional cement mortar sticking method;

◇ Good water resistance, moisture and impermeability, can be used in public places such as shopping malls and plazas;

◇ Good anti-aging performance, strong weather resistance, small shrinkage and not easy to crack;

◇ Suitable for cold and humid environments.

◇ The surface is condensed for a long time, enough time to adjust the paste stone;

Strong anti-falling and cohesive force, the artificial stone can be firmly adhered to the substrate to avoid peeling off.

Yi Shimei artificial stone binder construction process:

Base surface treatment:

◇ Make sure the substrate is firm and flat, no empty drum, clean on the base surface, no stains such as oil, release agent, floating dust and loose materials;

Substrate defects should be repaired in advance. It is recommended to use Easyplas to repair mortar MP520; if there is a bump, it will be knocked out;

◇ Wash with water and moisten the base surface to saturation, but not clear water;

◇ Ground leveling is recommended to achieve better leveling with Easypys easy-leveling mortar or easy-leveling ground mortar admixture.

Electric stirring:

In a suitable container, first inject the liquid curing agent (PartB), then slowly add the dry powder (Part A) according to the proportion, stir well with low speed at the electric stirrer, stir the powder until it is evenly agglomerated, no precipitation thick Thick paste; Allow to stand for 3 minutes, then stir for 1 to 2 minutes to use. (Remember not to stir over time, environmental factors can adjust the amount of water, but not excessive or too little)

Construction process:

Make sure there is no clear water on the surface of the substrate before construction. The stirred paste adhesive is evenly scraped on the construction surface with a thin layer of bottom; when the artificial stone is started, it is necessary to scrape a thin bottom with a binder on the back side of the artificial stone, It is advisable to reach one millimeter, and the back side of the brick can be seen faintly, and then the adhesive is applied to the back of the brick to control the thickness. The thickness is generally 5 mm.

The adhesive was evenly applied to the substrate with a toothed spatula and pulled into stripes. (Select the type of scraper according to the thickness and size of the stone: 10X10mm, if the stone is larger, suggest double-sided grouting) and ensure the thickness of the adhesive is 5mm.

Each batch is scraped about 1-2m. Within 20 minutes of the opening time, the stone is pressed against the base surface, and the stone is gently tapped with an elastic and flat plate so that each stone is evenly and firmly adhered to the stone adhesive. Ensure 100% coverage on the back of the stone: (If the application area is too large, the base application surface is dry, which affects the bond strength)

During the adjustment time, the position of the stone can be adjusted; after the adhesive is completely dried (about 24 hours), the caulking process can be carried out; within 24 hours after the construction, heavy load should be avoided on the stone surface.

Note: 1 It is best to use the stirred glue in 1-2 hours; 2 avoid mixing the dried glue with water and mixing.

Packaging and storage: engineering equipment. Store in a dry, cool place. The shelf life of unopened products is 12 months.

Yi Shimei artificial stone thin layer bonding method: (thickness ≧ 5mm)

The base surface is required to be firm, smooth, clean, free of empty drums, no cracking, and added with a dry powder (Part A). Please refer to the package instructions for the ratio.

No loose objects, etc.;

Allow the substrate to be saturated with clean water until the surface has no clear water.

3. Stirring

Stir well with a low-speed, high-power electric tool until it is agglomerated without agglomeration. Stirring time is 5-7 minutes.

4. Batch scraping

1. Confirm that there is no clear water on the base surface;

2. The scraping adhesive (bar shape / full batch scraping) thickness of about 5mm;

3. Paste artificial stone.

Back scraping artificial stone binder

5. Paste stone

1. Confirm that there is no clear water on the base surface;

2. The scraping adhesive (bar shape / full batch scraping) thickness of about 5mm;

3. The thin layer of artificial stone back scraping adhesive.

4. Paste artificial stone.

A thin layer of scraping adhesive on the back of the stone can achieve better results.

The stirred slurry is used within 1-2 hours; the batch scraping adhesive pastes the stone in 20 minutes, which can achieve the best bonding effect, and should not be pasted over time; when the stone is pasted, it should be slightly twisted and rocked up and down. Make sure the paste is secure. After the paste is applied for 24 hours, the subsequent process can be carried out.