PG521雙組份聚氨酯密封膠價格@大安
聚氨酯密封膠（polyurethanesealant）系以聚氨酯橡膠及聚氨酯預聚體為主要成分的密封膠。此類密封膠具有高的拉伸強度、優良的彈性、耐磨性、耐油性和耐寒性，但耐水性，特別是耐堿水性欠佳。可分為加熱硫化型、室溫硫化型和熱熔型三種。其中室溫硫化型又有單組分和雙組分之分。其廣泛用于建筑物、廣場、公路作為嵌縫密封材料，以及汽車制造、玻璃安裝、電子灌裝、潛艇和火箭等的密封。
Polyurethane sealant (polyurethanesealant) with polyurethane rubber and polyurethane pre polymers as the main component of the sealant. This kind of sealant with high tensile strength, good elasticity, abrasion resistance, oil resistance and cold resistance, but water resistance, especially in poor alkali water. Can be divided into sulfide type, room temperature vulcanizing type heating and hot melt type 3 kinds. Type of room temperature vulcanization is one component of two pairs of points and the points. It is widely used in building, plaza, highway as joint sealing material, and car manufacturing, glass installation, electronic seal of filling, submarines and rocket etc.
聚氨酯密封膠有如下特點:優良的耐磨性;低溫柔軟性;性能可調節范圍較廣;機械強度大;
粘接性好;彈性好，具有優良復原性，可適合于動態接縫;耐候性好，使用壽命可達15~20年;耐油性能優良;耐生物老化;價格適中。
聚氨酯密封膠也有一些缺點。如:不能*耐熱;淺色配方容易受紫外光老化;單組分膠貯存穩定性受包裝及外界影響較大，通常固化較慢;高溫熱環境下可能產生氣泡和裂紋;許多場合需要底涂。同時聚氨酯密封膠耐水性也較差，特別是耐堿水性欠佳。
Polyurethane sealant has the following characteristic: good abrasion resistance; Low tender and soft; Performance of the adjustable range is wide; Mechanical strength;
Good adhesion; Good elasticity, excellent resilience, can be suitable for dynamic joint; Weather is good, life can be up to 15 ~ 20 years; A fine oil resistant performance; Biological aging resistance; The price is moderate.
Polyurethane sealant has some shortcomings. Such as: can't long-term heat; Light color formula susceptible to ultraviolet aging; One-component adhesive storage stability are greatly influenced by packaging and the outside world, usually curing slower; Bubbles and cracks under high temperature and thermal environment may; Many occasions need to be painted. Polyurethane sealant at the same time also poor water resistance, especially in poor alkali water.
聚氨酯密封膠的主要用途是土木建筑業、交通運輸業等。如在日本，約75~80%的聚氨酯密封膠用于建筑，15%用于汽車、機械制造等，5%用于土木及其它方面。
在建筑方面的具體應用有:混凝土預制件等建材的連接及施工縫的填充密封，門窗的木框四周及墻的混凝土之間的密封嵌縫，建筑物上輕質結構(如幕墻)的粘貼嵌縫，陽臺、游泳池、浴室等設施的防水嵌縫，空調及其它體系連接處的密封，隔熱雙層玻璃、隔熱窗框的密封等。
聚氨酯密封膠在汽車方面的應用有:車窗(主要是風擋玻璃)的裝配密封，車身與其它部件的裝配等。
在土木方面，聚氨酯密封膠用于高等級道路、橋梁、飛機跑道等有伸縮性接縫的嵌縫密封及混凝土、陶質、PVC等材質的下水道、地下煤氣管道、電線電路管道等管道接頭處的連接密封，地鐵隧道及其它地下隧道連接處的密封等。
聚氨酯密封膠還可用于電纜(如地下電纜)的柔性接頭、電子元器件的灌封，以防塵抗震;用于隔熱體系如冷藏車、冷庫保溫層及低溫容器的粘接密封等等。
The main purpose of the polyurethane sealant is civil construction, transportation, etc. Such as in Japan, about 75 to 80% of the polyurethane sealant used for construction, 15% used in auto, machinery manufacturing, etc., 5% used in civil engineering and other aspects.
In the specific application in the field of architecture are: the connection between concrete casting, building materials and construction joint filler sealing, around the wooden frame of door window and wall of concrete between the sealing caulking, light on the building structure, such as curtain wall sealing paste, balcony, swimming pool, bathroom facilities such as waterproof sealing, air conditioning and other systems joint sealing, heat insulation double deck glass, window frame seal, etc.
The application of polyurethane sealant in the auto are: Windows (mainly windshield) assembly of the seal, body and the other parts of the assembly and so on.
In civil, polyurethane sealant used for high-grade roads, Bridges, airstrips and other flexible joint sealing caulking and concrete, ceramic, the material such as PVC drain pipelines pipeline, underground gas, electrical wiring circuit connection joint sealing, subway tunnels and other underground tunnel joint sealing etc.
Polyurethane sealant can also be used for cable, such as underground cable joint, electronic potting, dustproof seismic; Used for heat insulation system such as refrigerator, cold storage insulation and low temperature vessels adhesive sealing and so on.
