Effect of formula compositions on compressive strength of polyurethane grouting materials

doi:10.19491/j.issn.1001-9278.2023.02.002

Abstract

Abstract:

To understand the effect of raw materials on the mechanical properties of polyurethane grouting materials （PGMs）， a series of solvent⁃free and environmentally friendly PGMs were prepared using polyester polyol （polyether polyol） and isocyanate as main raw materials together with surfactants， catalysts， cross⁃linking agents， and foaming agents as additives. The properties of the as⁃prepared PGMs， including the characteristics of functional groups， cellular structure， and compressive strength， were characterized by using Fourier⁃transform infrared spectroscopy and scanning electron microscopy， etc. The results indicated that the addition of 10 % polyester polyol increased the content of the benzene ring in the system， resulting in an improvement in the compressive strength up to 1.09 MPa. The optimum proportion of PGMs was determined to be polyether polyol 90 phr， polyester polyol 10 phr， triethylenediamine 0.6 phr， dibutyltin dilaurate 0.6 phr， surfactant 2.0 phr， triethanolamine 4.0 phr， water 2.5 phr， and blowing agent monofluorodichloroethane 9 phr according to the polyol mass in the units through calculating the loadings of the raw materials.

Key words: polyurethane grouting material, polyester polyol, polyether polyol, compressive strength, cellular structure

CLC Number:

TQ328.3

WANG Zehui, WANG Zhenjun, WANG Xiaofeng, YANG Bo, LI Shuai. Effect of formula compositions on compressive strength of polyurethane grouting materials[J]. China Plastics, 2023, 37(2): 7-14.

Figures/Tables 16

Fig.1. Schematic diagram of polymer grouting technology

水分/

Tab.1. Properties of YHY4110 and PS⁃3152

Fig.2. Structural formulae of polyether polyol and polyester polyol

Fig.3. Effects of PS⁃3152 on functional groups of PGMs

Fig.4. Effects of polyester polyols on compressive strength of PGMs

1.0

0.6

1.0

1.92

3.06

1.45

Tab.2. Effects of catalyst on compressive strength of PGMs

Fig.5. Mechanism of PGMs gel reaction and foaming reaction

Fig.6. Effects of surfactant content on cellular structure of PGMs

Fig.7. SEM image processing steps for PGMs cellular structure

表面活性剂掺量/%	d_i /μm
1	1 108
2	942
3	902
4	1 072
5	905

Tab.3. Effects of surfactant on di of PGMs cellular structure

Fig.8. Molecular structure of silicone surfactant

Fig.9. Effects of surfactant on compressive strength of PGMs

Fig.10. Effects of TEOA on compressive strength of PGMs

Fig.11. 3D structure of TEOA

组别	水/%	HCFC⁃141b/%	抗压强度/MPa
W⁃1	0.5	6	—
W⁃2	1.5	6	1.09
W⁃3	2.5	6	1.03
W⁃4	3.5	6	0.63
H⁃1	1.5	3	0.87
H⁃2	1.5	6	1.09
H⁃3	1.5	9	1.11
H⁃4	1.5	12	1.00

Tab.4. Effects of foaming agent content on PGM compressive strength

Fig.12. Effects of foaming agent on expansion rate and total apparent density of PGMs

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