PG521双组份聚氨酯密封胶价格@大安
聚氨酯密封胶（polyurethanesealant）系以聚氨酯橡胶及聚氨酯预聚体为主要成分的密封胶。此类密封胶具有高的拉伸强度、优良的弹性、耐磨性、耐油性和耐寒性，但耐水性，特别是耐碱水性欠佳。可分为加热硫化型、室温硫化型和热熔型三种。其中室温硫化型又有单组分和双组分之分。其广泛用于建筑物、广场、公路作为嵌缝密封材料，以及汽车制造、玻璃安装、电子灌装、潜艇和火箭等的密封。
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.
聚氨酯密封胶有如下特点:优良的耐磨性;低温柔软性;性能可调节范围较广;机械强度大;
粘接性好;弹性好，具有优良复原性，可适合于动态接缝;耐候性好，使用寿命可达15~20年;耐油性能优良;耐生物老化;价格适中。
聚氨酯密封胶也有一些缺点。如:不能*耐热;浅色配方容易受紫外光老化;单组分胶贮存稳定性受包装及外界影响较大，通常固化较慢;高温热环境下可能产生气泡和裂纹;许多场合需要底涂。同时聚氨酯密封胶耐水性也较差，特别是耐碱水性欠佳。
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.
聚氨酯密封胶的主要用途是土木建筑业、交通运输业等。如在日本，约75~80%的聚氨酯密封胶用于建筑，15%用于汽车、机械制造等，5%用于土木及其它方面。
在建筑方面的具体应用有:混凝土预制件等建材的连接及施工缝的填充密封，门窗的木框四周及墙的混凝土之间的密封嵌缝，建筑物上轻质结构(如幕墙)的粘贴嵌缝，阳台、游泳池、浴室等设施的防水嵌缝，空调及其它体系连接处的密封，隔热双层玻璃、隔热窗框的密封等。
聚氨酯密封胶在汽车方面的应用有:车窗(主要是风挡玻璃)的装配密封，车身与其它部件的装配等。
在土木方面，聚氨酯密封胶用于高等级道路、桥梁、飞机跑道等有伸缩性接缝的嵌缝密封及混凝土、陶质、PVC等材质的下水道、地下煤气管道、电线电路管道等管道接头处的连接密封，地铁隧道及其它地下隧道连接处的密封等。
聚氨酯密封胶还可用于电缆(如地下电缆)的柔性接头、电子元器件的灌封，以防尘抗震;用于隔热体系如冷藏车、冷库保温层及低温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.
