The sealant strip of doors and windows needs to be waterproof, sealed and energy-saving. It has the functions of sound insulation, dust-proof, antifreeze and heat preservation. It also has strong tensile strength, good elasticity, and better temperature resistance and aging resistance. At present, the sealing strip market generally includes modified PVC, vulcanized EPDM / PP sealing strip and thermoplastic EPDM / PP rubber strip.
Classification and characteristics of sealant strips for doors and windows
According to statistics, the energy consumption of buildings in China has accounted for 27.5% of the total energy consumption of the whole society. The energy loss through the gaps around the airtight doors and windows usually accounts for about 37-40% of the total energy consumption of buildings. Therefore, it is very important to improve the sealing performance between sash and glass, especially between sash and sash.
1. Modified PVC adhesive strip
Modified PVC rubber strip: the price is relatively low. Due to different quality, low-end products use waste materials, substitute plasticizers and high filling volume, resulting in poor elasticity of rubber strip, easy hardening, pungent smell, easy migration, yellowing of frame material, short service life. Because PVC products contain halogen and stabilizers contain heavy metals, it is not conducive to environmental protection. Therefore, PVC adhesive strips have been eliminated or restricted in developed countries, domestic Beijing and coastal cities.
2. Vulcanized EPDM sealing strip
EPDM vulcanized rubber sealing strip: it is stronger than PVC strip in sealing elastic durability, but due to the need of microwave vulcanization line finalization, the processing energy consumption is high, usually more than 20 times of PVC processing, the product can not be reused, not environmental protection, not the product advocated by the state.
3. Thermoplastic EPDM sealing strip
Thermoplastic EPDM sealing strip is a new material developed on the basis of foreign technology and domestic independent research and development in recent years. It is mainly used for automobile door and window sealing strip, and has been used for building door and window sealing strip in recent years.
Its outstanding advantages are:
① The performance and service life of the sealing strip are equivalent to that of EPDM vulcanized sealing strip.
② The processing energy consumption is lower than that of EPDM vulcanizate (equivalent to PVC).
③ It does not contain heavy metals such as halogen and lead, and can be recycled after several years, meeting the requirements of green building materials.
④ Small proportion (only 0.9-0.95) and high window rate. It seems that the purchase unit price is high and the actual use cost is low. In recent years, this kind of product has developed rapidly in the use of building doors and windows.
Its product features are:
1. Light volume weight, large expansion strength, no water absorption (instead of traditional three oil four felt, asphalt wood fir board and other materials). Product environmental protection, simple construction, anti-seepage, leak proof, water stop effect is good.
2. Corrosion resistance, aging resistance, high and low temperature resistance + 80 ℃ ~ - 45 ℃ without flowing, deformation, embrittlement and long service life.
3. It has an independent opening bubble structure. The appearance of the special joint plate is honeycomb like holes evenly distributed. It can be tightly bonded with cement / sealant without roughening, adapt to the change of natural expansion and contraction, and enhance the sealing expansion and water stop effect of the joint.
How to distinguish the performance of sealing strip?
In fact, in the actual production process of doors and windows, the investment of sealing strip accounts for a small proportion, but its role can not be ignored. Such as water-proof, sealing and energy-saving, sound insulation, dust-proof, antifreeze, heat preservation, temperature resistance, aging resistance, these functions can not be ignored in daily life.
So how to identify it? Xiaobian sorted out the following points:
1. Use the nose to smell whether there is peculiar smell. Normally there will be a little mellow smell of the son, but it can hardly be smelled.
2. Wrap the sealing strip on the profile as tightly as possible, and put it on the roof or sunny place for a period of time under high temperature. Check whether the contact surface between profile surface and sealing strip is stained and discolored, whether the dust on the surface of sealing strip is yellow (it is easy to absorb soil if there is oil), whether there is oil leakage, and whether there is dirty hands.
3. There will be a lot of cheaper sealing strip fillers, so the surface will not be very bright, and those that are very cheap and do not have a bright appearance are not advisable.
4. See the specific gravity. Add the sealing strip of heavy calcium, you stretch it back and forth several times by hand, and a small amount of white powder will appear on its surface.
How to choose sealant strip, the buyer has to practice a pair of "hot eyes".
1. Combustion method (rubber strip that can distinguish thermoplastic and rubber)
　　
A. After burning, the rubber strip will become ash and cannot be drawn. Among them, if the ash is white, the one that will be extinguished on the white paper will still be white is silicone rubber; if the ash is black, the one that will be extinguished on the white paper will be black is EPDM or neoprene rubber; if the ash is black, the one that will be extinguished on the white paper will be natural rubber.
　　
B. After burning, the thermoplastic elastic rubber strip can be drawn into filaments at the extinguishing point, and EVA (ethylene vinyl acetate copolymer) has obvious vinegar taste. PE (polyethylene) and PP (polypropylene) have obvious burning taste of candle, which can burn continuously with melting depression. PVC (polyvinyl chloride) adhesive strip has the characteristics of flameout immediately after leaving the fire, and with black smoke and pungent smell.
　　
C. TPV thermoplastic vulcanized rubber: the surface is matte, there is melt drawing phenomenon, floating on the water surface or suspended state.
　　
D. SEBS thermoplastic elastomer sealing strip: the surface is matte, there is melt drawing phenomenon, and it sinks slowly in the water.
2. Tension measurement
　　
Relatively speaking, as sealant strip material, it should have certain tensile strength, standard requirement: strength ≥ 5MPa. The higher the glue content of the same material, the better the pull force. Generally speaking, the service life will be longer and the sealing effect will be better.
　　
3. Smell
Smell whether there is peculiar smell with the nose. The normal PVC material has a little alcohol smell, almost no peculiar smell.
　　
4. Wrap the sealing strip on the profile as tightly as possible, and put it on the roof or sunny place for a period of time under high temperature.
　　
Check whether the contact surface between profile surface and sealing strip is stained and discolored, whether the dust on the surface of sealing strip is yellow (it is easy to absorb soil if there is oil), whether there is oil leakage, and whether there is dirty hands.
　　
5. There will be a lot of cheaper sealing strip fillers, so the surface will not be very bright, and those that are very cheap and have no bright appearance are not advisable.
Now there are many doors and windows businesses in order to save costs and obtain high profits using ordinary PVC adhesive strip. Due to the improper selection of sealant strip, it is easy to cause many quality problems, such as: the sealant strip is hard and brittle soon after use, losing the elasticity and sealing function; after installation, the rubber strip shrinks and falls off in a short time, resulting in rework; after being exposed to sunlight or heated, the sealant strip is sticky, adheres to the window and glass, and sometimes "oil leakage" phenomenon occurs, resulting in pollution Doors and windows affect the sealing function and aesthetics of doors and windows, or the "false" installation of sealant strips due to structural reasons, or even no sealing function at all.
In order to ensure the better functionality of high-grade doors and windows, most of the star products in the construction door and window industry - EPDM. It has excellent comprehensive performance, outstanding ozone resistance, excellent weather resistance, good high temperature and low temperature resistance, outstanding chemical resistance, resistance to a variety of polar solutes, and low relative density. The operating temperature range is - 60 ～ + 150 ℃. EPDM sealant strip has been recognized by domestic and foreign industries for its wide range of application and excellent comprehensive performance.
Although the door and window sealant strip is only a small part of the door and window structure, its existence plays an important role, so it is very important to use a good sealant strip in the process of decoration of doors and windows.
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