Study on properties of glass fiber reinforced modified polyformaldehyde
Wang Dong1,2， Yin Lijing1,2， Xie Yunfeng1,2
1. Tangshan Zhonghao Chemical Corporation Ltd., Tangshan 063611, China; 2. Hebei Provincial Technology Research Center of Coal-based Fine Chemical, Tangshan 063611, China
Abstract：Two kinds of polyformaldehyde (POM) with different fluidity were reinforced by short glass fiber (GF), the changes of mechanical properties of the two modified products were analyzed. The research shows that when K90 coformaldehyde is used as the base material, although the reinforcement effect is more obvious, the melt index (MI) decreases more, and the processing fluidity becomes worse; K270 coformaldehyde with good fluidity is selected as the base materia, when the amount of glass fiber added is between 20%~25%, the product has good fluidity and is suitable for the development of reinforced modified products. Glass fiber has a good reinforcing effect on POM, its tensile strength was increased from 62 MPa to 120 MPa， the tensile modulus was increased from 2 599 MPa to 8 950 MPa, nearly three times higher, and the bending strength was increased from 79 MPa to 176 MPa. Moreover, the impact performance of the product is little affected by the addition of glass fiber, which can be maintained at 7.0 KJ/m2, and the effect of reinforcement and modification is very ideal.
