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What are the advantages of polyurethane resin pultrusion over unsaturated resin and epoxy resin?
Release time：
2022/06/06
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Compared with unsaturated polyester, vinyl ester, epoxy resin and other
resins, the mechanical and physical properties of polyurethane resin pultruded
products molded by high pressure polyurethane resin injection machine have
been improved in an all-round way. Take a polyurethane specially prepared for
pultrusion process as an example.Pultruded polyurethane products exhibit
excellent flexural strength, flexural modulus, and short beam shear properties.
In general, the strength and rigidity of polyurethane are 2 to 5 times higher
than that of polyurethane resin.
The typical physical and mechanical performance of polyurethane resin for
pultrusion is as follows:
Bending
strength/MPa
＞1200
D790
Flexural
modulus/GPa
48
D790
Bending strain/%
3.0
D790
Charpy impact
strength/Jk
·m-2
＞189
(ISO 179)
Short-term shear
strength/MPa
＞62
D2344
Heat distortion temperature (1820 KPa)
/℃ 240
D648
It is worth mentioning that the water absorption of polyurethane pultruded
products is much lower than that of other resins, because the surface is hard
and the porosity is low. In general, when pultruded products absorb moisture
or other solutions, the exudates may cause degradation, especially for resins
that are prone to hydrolysis. In order to improve water resistance and
ultraviolet resistance,Can be coat on that surface of the polyurethane
pultruded product.
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