600聚氨酯密封胶

聚氨酯密封胶是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。它可分为加热硫化型、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。
Polyurethane sealant is a kind of sealant with polyurethane rubber and polyurethane prepolymer as the main component. This kind of sealant has high tensile strength, good elasticity, abrasion resistance, oil resistance and cold resistance, but water resistance, especially alkali resistance, is poor. It can be divided into three types: heating vulcanization type, room temperature vulcanization type and hot melt type. Among them, room temperature vulcanization has one component and two components.
聚氨酯密封胶的应用及常识

Application and common sense of polyurethane sealant
聚氨酯密封胶是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。它可分为加热硫化型、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。
Polyurethane sealant is a kind of sealant with polyurethane rubber and polyurethane prepolymer as the main component. This kind of sealant has high tensile strength, good elasticity, abrasion resistance, oil resistance and cold resistance, but water resistance, especially alkali resistance, is poor. It can be divided into three types: heating vulcanization type, room temperature vulcanization type and hot melt type. Among them, room temperature vulcanization has one component and two components.
聚氨酯密封胶广泛用于建筑物、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 is widely used in buildings, squares, roads as caulking sealing materials, sealing and automobile manufacturing, installation of glass, electronic filling, submarines and the rockets.
聚氨酯密封胶有如下特点：优良的耐磨性、低温柔软性以及性能可调节范围较广、机械强度大、粘接性好、弹性好，并且具有优良的复原性，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，耐生物老化性好且价格适中。
Polyurethane sealant has the following characteristics: excellent abrasion resistance, low temperature flexibility and performance can be adjusted in a wide range, high mechanical strength, good adhesion, good elasticity, and has excellent resilience, can be suitable for the dynamic joint, good weather resistance, service life can reach 15~20 years, excellent oil resistance, resistance to biological aging is good and the price is moderate.
但是聚氨酯密封胶也有一些缺点如：不能长期耐热，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。
But polyurethane sealant also has some disadvantages, such as: not long term heat resistance, light color formula is susceptible to ultraviolet light aging, the stability of single component gel storage is affected by packaging and the outside world, usually slow curing, high temperature environment may produce bubbles and cracks.