CN116003023A - Modified glass fiber powder reinforced polyurethane concrete and preparation method thereof - Google Patents
Modified glass fiber powder reinforced polyurethane concrete and preparation method thereof Download PDFInfo
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 107
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 107
- 239000003365 glass fiber Substances 0.000 title claims abstract description 80
- 239000004567 concrete Substances 0.000 title claims abstract description 61
- 239000000843 powder Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 53
- 230000001070 adhesive effect Effects 0.000 claims abstract description 53
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 44
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007822 coupling agent Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000243 solution Substances 0.000 claims abstract description 13
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- 238000003756 stirring Methods 0.000 claims abstract description 7
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- 238000005406 washing Methods 0.000 claims abstract description 3
- -1 polyoxypropylene Polymers 0.000 claims description 26
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 20
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 19
- 229920001228 polyisocyanate Polymers 0.000 claims description 15
- 239000005056 polyisocyanate Substances 0.000 claims description 15
- IBOFVQJTBBUKMU-UHFFFAOYSA-N 4,4'-methylene-bis-(2-chloroaniline) Chemical compound C1=C(Cl)C(N)=CC=C1CC1=CC=C(N)C(Cl)=C1 IBOFVQJTBBUKMU-UHFFFAOYSA-N 0.000 claims description 10
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 10
- 229920001451 polypropylene glycol Polymers 0.000 claims description 10
- 229920006389 polyphenyl polymer Polymers 0.000 claims description 9
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 7
- OEOIWYCWCDBOPA-UHFFFAOYSA-N 6-methyl-heptanoic acid Chemical compound CC(C)CCCCC(O)=O OEOIWYCWCDBOPA-UHFFFAOYSA-N 0.000 claims description 7
- 229910052797 bismuth Inorganic materials 0.000 claims description 7
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical group [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 6
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- 238000000034 method Methods 0.000 claims description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 claims description 2
- 238000004448 titration Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract description 15
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses modified glass fiber powder reinforced polyurethane concrete, and belongs to the technical field of polyurethane concrete. The raw material components of the polyurethane adhesive comprise polyurethane adhesive and aggregate, wherein the polyurethane adhesive comprises 5-20wt% of siloxane coupling agent modified glass fiber powder; the preparation method of the siloxane coupling agent modified glass fiber powder comprises the following steps: dissolving a siloxane coupling agent in a water/ethanol mixed solution, and uniformly stirring; grinding glass fiber, sieving with 1000 mesh sieve to obtain glass fiber powder, adding into solution, and performing ultrasonic treatment; and (5) after ultrasonic treatment, washing with ethanol and drying to obtain the product. The addition of 15wt% glass fiber powder composite produced a polymer that enhanced the static elastic modulus by 38.7%, flexural strength by 112.0%, flexural modulus by 225.3% and adhesive strength by 44.9% relative to pure polyurethane concrete.
Description
Technical Field
The invention relates to the technical field of polyurethane concrete, in particular to modified glass fiber powder reinforced polyurethane concrete and a preparation method thereof.
Background
The polyurethane concrete is a pavement repair material formed by using polyurethane adhesive to replace cement-based material as cementing material and physically mixing with inorganic aggregate. Because of its rapid cure time and strong bonding capability, great attention is drawn to industry and academia. Compared with common cement, the polymer concrete has unique properties including strong chemical corrosion resistance, high specific strength, short curing time, strong bonding capability and excellent sound insulation and sound isolation performance.
The polyurethane adhesive has better toughness, faster curing rate, excellent low-temperature elasticity, low cost and solvent-free preparation compared with other resins. Polyurethanes are mainly used as repair materials or decorative materials, but they have recently been used as main building material bodies in some fields. The polyurethane polymer concrete has high compressive strength and high flexural strength, and can be rapidly cured. Polyurethane concrete has excellent chemical corrosion resistance, weather resistance and wear resistance, and is not easy to crack and damage. Ordinary cement concrete is very prone to voids and cracks and causes secondary cracks to form. The movement of the corroded substrate through the cracks and voids causes the breaking of the concrete and eventually results in the destruction of the overall structure. In polyurethane polymer concrete, the polymer can fill the gaps between the aggregates, thereby reducing the probability of external corrosion attack on the concrete.
However, when the adhesive polyurethane adhesive which is rapidly cured at room temperature is applied to polymer concrete, the static elastic modulus and the flexural modulus of the adhesive polyurethane adhesive are weak, the adhesive polyurethane adhesive is easy to deform, the application range of the adhesive polyurethane adhesive is limited, and meanwhile, the adhesive polyurethane adhesive is easy to crack.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a modified glass fiber powder reinforced polyurethane concrete and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme.
The raw material components of the modified glass fiber powder reinforced polyurethane concrete comprise polyurethane adhesive and aggregate, wherein the polyurethane adhesive comprises 5-20wt% of siloxane coupling agent modified glass fiber powder; the aggregate is Chinese standard sand which accords with the industrial standard (JC/T108-2008);
the preparation method of the siloxane coupling agent modified glass fiber powder comprises the following steps:
dissolving a siloxane coupling agent in a water/ethanol mixed solution, and uniformly stirring; grinding glass fiber, sieving with 1000 mesh sieve to obtain glass fiber powder, adding into solution, and performing ultrasonic treatment; and (5) after ultrasonic treatment, washing with ethanol and drying to obtain the product.
Specifically, the glass fiber powder is ground into powder by a grinder, and the powder is sieved by a 1000-mesh sieve. And (3) treating the functional groups on the surfaces of the modified particles by adopting a siloxane coupling agent. First, the alkylene oxide coupling agent was dissolved in a water/ethanol mixed solvent and stirred for 1 hour. Then, glass fiber powder was added to the solution, and the above mixture was sonicated with a cell pulverizer for 1 hour. After sonication, the glass fiber powder was washed twice with ethanol to remove the remaining siloxane, and finally dried in an oven at 120 ℃ for 2 hours.
Preferably, the siloxane coupling agent is used in an amount of 1.9 to 2.1wt% based on the mass of the water/ethanol mixed solution.
Preferably, the mass ratio of water to ethanol in the water/ethanol mixed solution is 1:1-1.2.
Preferably, the mass ratio of the glass fiber powder to the siloxane coupling agent is 50-55:1.
Preferably, the siloxane coupling agent is one of aminopropyl triethoxysilane, gamma- (2, 3-glycidoxy) propyl trimethoxysilane, gamma-methacryloxypropyl trimethoxysilane.
Preferably, the adhesive further comprises, in weight percent: 15 to 20 weight percent of 4,4' -methylene-bis (o-chloroaniline), 65 to 70 weight percent of polyoxypropylene ether glycol, 0.1 to 0.3 weight percent of catalyst, 0.25 to 0.75 weight percent of defoamer and 10 to 15 weight percent of polymethylene polyisocyanate.
Preferably, the polyoxypropylene ether glycol has mn=2000 g/mol.
Preferably, the catalyst is bismuth isooctanoate (Bi (Oc) 2 ) The defoamer is
The polymethylene polyisocyanate is a polyphenyl polymethylene polyisocyanate.
Preferably, the preparation method of the adhesive comprises the following steps:
mixing 4,4' -methylene-bis (o-chloroaniline), polyoxypropylene ether glycol, a catalyst and a defoaming agent, and stirring in a flask at 80 ℃ under nitrogen atmosphere for 0.8-1.2h; cooling the mixture, storing and sealing in a container for later use; adding siloxane modified glass fiber powder, and uniformly stirring; then evenly mixing with polymethylene polyisocyanate; injecting into a mold, and curing at room temperature to obtain the polyurethane adhesive.
Preferably, the method comprises the following steps in parts by weight: 25-35 parts of polyurethane adhesive and 65-75 parts of aggregate.
The preparation method of the modified glass fiber powder reinforced polyurethane concrete comprises the following steps:
and (3) uniformly mixing the polyurethane adhesive and the aggregate, injecting the mixture into a mold, demolding and curing to obtain the polyurethane adhesive.
The invention adopts the siloxane coupling agent to treat and modify to modify the functional groups on the surface of the glass fiber particles, thereby increasing the wettability of the glass fiber powder. The glass fiber powder is ground and passes through a 1000-mesh sieve, the specific surface area is large, and the influence of the siloxane coupling agent on the size distribution of glass fiber powder particles is small. The strong hydrogen bond interaction between the modified glass fiber powders limits the movement of the polyurethane chain segments, thereby increasing the rigidity of the chain segments. The existence of the modified glass fiber powder can effectively limit the generation of cracks between the aggregate and the polyurethane, thereby improving the mechanical property of the polyurethane adhesive. The addition of the modified glass fiber powder can effectively improve the thermal stability of the polyurethane adhesive. The crystallinity of polyurethane decreases with increasing content of modified glass fiber powder, while strong hydrogen bonding interaction forces between polymer and inorganic particles also limit the crystallization of polyurethane hard segments. The soft segment of polyurethane consists of polyoxypropylene ether glycol chains, which have long interlaced chains; the hard segments of the polyurethane consist of polyphenyl polymethylene polyisocyanate and 4,4' -methylene-bis (o-chloroaniline), the hard segments being dispersed as a dispersed phase within the soft segments as a continuous phase.
Compared with the prior art, the invention has the advantages that:
according to the modified glass fiber powder reinforced polyurethane concrete, the mechanical property of the concrete is improved and the thermal stability is improved through modification of glass fibers. Polyurethane concrete has a lower static elastic modulus and a higher elastic deformation capacity than cement concrete. The strong interfacial adhesion capability between the polyurethane substrate and the modified glass fiber powder particles, which limits the segmental motion of the polyurethane substrate. The addition of 15wt% glass fiber powder composite produced a polymer that enhanced the static elastic modulus by 38.7%, flexural strength by 112.0%, flexural modulus by 225.3% and adhesive strength by 44.9% relative to pure polyurethane concrete.
Drawings
FIG. 1 is a compressive stress strain curve of a cured polyurethane concrete;
FIG. 2 is a graph showing the compressive strength and static elastic modulus of polyurethane concrete as a function of glass fiber content;
FIG. 3 is a plot of flexural stress strain of the cured polyurethane concrete;
FIG. 4 is a graph showing the flexural strength and flexural modulus of polyurethane concrete as a function of glass fiber content.
Detailed Description
The invention is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the invention is not limited thereby. In the following examples, the materials and equipment used are commercially available unless otherwise specified.
The raw materials and equipment used in the examples are as follows:
aminopropyl triethoxysilane: analytically pure, morning light.
4,4' -methylene-bis (o-chloroaniline): analytically pure, hunan chemical Co., ltd.
Polyoxypropylene ether glycol: mn=2000 g/mol, shandong Lanxing Dong chemical Co., ltd.
Bismuth isooctanoate (Bi (Oc)) 2 : analytically pure, shanghai De Chemie Co.
Polyphenyl polymethylene polyisocyanates: analytically pure, wanhua chemical group Co., ltd.
Water: tap water.
Example 1 (comparative example)
2g of aminopropyl triethoxysilane are dissolved in 100g of water/ethanol (1:1 mass ratio) and stirred for 1 hour. Next, glass fiber powder particles were added to the solution, and the above mixture was sonicated with a cell pulverizer for 1 hour. After sonication, the glass fiber powder particles were washed twice with ethanol to remove the remaining siloxane, and finally dried in an oven at 120 ℃ for 2 hours.
Polymer adhesive Base component for preparing polymer concrete: 53.4g of 4,4' -methylene-bis (o-chloroaniline), 200g of polyoxypropylene ether glycol, 0.5g of bismuth isooctanoate (Bi (Oc) 2 )，1.25g
The above materials were mixed and stirred in a nitrogen atmosphere at 80℃for 1 hour in the flask. The mixture is stored and sealed in a container for standby after being cooled.
The Base component of the polyurethane adhesive was vigorously stirred with a mechanical stirrer for 5 minutes. The mixture was then mixed with 40g of polyphenyl polymethylene polyisocyanate in a disposable cup for 2 minutes to obtain a polyurethane adhesive.
Example 2
2g of aminopropyl triethoxysilane are dissolved in 100g of water/ethanol (1:1 mass ratio) and stirred for 1 hour. Next, glass fiber powder particles were added to the solution, and the above mixture was sonicated with a cell pulverizer for 1 hour. After sonication, the glass fiber powder particles were washed twice with ethanol to remove the remaining siloxane, and finally dried in an oven at 120 ℃ for 2 hours.
Polymer adhesive Base component for preparing polymer concrete: 53.4g of 4,4' -methylene-bis (o-chloroaniline), 200g of polyoxypropylene ether glycol, 0.5g of bismuth isooctanoate (Bi (Oc) 2 )，1.25g
The above materials were mixed and stirred in a nitrogen atmosphere at 80℃for 1 hour in the flask. The mixture is stored and sealed in a container for standby after being cooled.
5wt% of the surface modified glass fiber powder was added to the Base component of the polyurethane adhesive. The mixture components were vigorously stirred with a mechanical stirring paddle for 5 minutes. The mixture was then mixed with 40g of polyphenyl polymethylene polyisocyanate in a disposable cup for 2 minutes. The freshly prepared polyurethane/glass fiber powder composite is then injected into a mold and cured at room temperature for 5 hours to obtain the polyurethane adhesive.
Example 3
1.9g of aminopropyl triethoxysilane are dissolved in 100g of water/ethanol (1:1 mass ratio) and stirred for 1 hour. Next, glass fiber powder particles were added to the solution, and the above mixture was sonicated with a cell pulverizer for 1 hour. After sonication, the glass fiber powder particles were washed twice with ethanol to remove the remaining siloxane, and finally dried in an oven at 120 ℃ for 2 hours.
Polymer adhesive Base component for preparing polymer concrete: 53.8g of 4,4' -methylene-bis (o-chloroaniline), 203g of polyoxypropyleneEther glycol, 0.5g bismuth isooctanoate (Bi (Oc)) 2 )，1.23g
The above materials were mixed and stirred in a nitrogen atmosphere at 80℃for 1 hour in the flask. The mixture is stored and sealed in a container for standby after being cooled.
15wt% of the surface-modified glass fiber powder was added to the Base component of the polyurethane adhesive. The mixture components were vigorously stirred with a mechanical stirring paddle for 5 minutes. The mixture was then mixed with 40g of polyphenyl polymethylene polyisocyanate in a disposable cup for 2 minutes. The freshly prepared polyurethane/glass fiber powder composite is then injected into a mold and cured at room temperature for 5 hours to obtain the polyurethane adhesive.
Example 4
2.1g of aminopropyl triethoxysilane are dissolved in 100g of water/ethanol (1:1 mass ratio) and stirred for 1 hour. Next, glass fiber powder particles were added to the solution, and the above mixture was sonicated with a cell pulverizer for 1 hour. After sonication, the glass fiber powder particles were washed twice with ethanol to remove the remaining siloxane, and finally dried in an oven at 120 ℃ for 2 hours.
Polymer adhesive Base component for preparing polymer concrete: 53.2g of 4,4' -methylene-bis (o-chloroaniline), 198g of polyoxypropylene ether glycol, 0.5g of bismuth isooctanoate (Bi (Oc) 2 )，1.22g
The above materials were mixed and stirred in a nitrogen atmosphere at 80℃for 1 hour in the flask. The mixture is stored and sealed in a container for standby after being cooled.
20wt% of the surface-modified glass fiber powder was added to the Base component of the polyurethane adhesive. The mixture components were vigorously stirred with a mechanical stirring paddle for 5 minutes. The mixture was then mixed with 40g of polyphenyl polymethylene polyisocyanate in a disposable cup for 2 minutes. The freshly prepared polyurethane/glass fiber powder composite is then injected into a mold and cured at room temperature for 5 hours to obtain the polyurethane adhesive.
Example 5 (comparative example)
30 parts of the polyurethane adhesive of example 1, 70 parts of aggregate, were mixed and stirred in a vessel for 2 minutes. Finally, the freshly prepared polyurethane concrete was poured into steel molds and compacted with vibrators. The polyurethane concrete was demolded after 1 hour and cured at room temperature for 4 hours.
Example 6
30 parts of the polyurethane adhesive of example 1, 70 parts of aggregate, were mixed and stirred in a vessel for 2 minutes. Finally, the freshly prepared polyurethane concrete was poured into steel molds and compacted with vibrators. The polyurethane concrete was demolded after 1 hour and cured at room temperature for 4 hours.
Example 7
30 parts of the polyurethane adhesive of example 2, 70 parts of aggregate, were mixed and stirred in a vessel for 2 minutes. Finally, the freshly prepared polyurethane concrete was poured into steel molds and compacted with vibrators. The polyurethane concrete was demolded after 1 hour and cured at room temperature for 4 hours.
Example 8
30 parts of the polyurethane adhesive of example 4, 70 parts of aggregate, and modified glass fiber particles were mixed together and stirred in a vessel for 2 minutes. Finally, the freshly prepared polyurethane concrete was poured into steel molds and compacted with vibrators. The polyurethane concrete was demolded after 1 hour and cured at room temperature for 4 hours.
The samples of polyurethane concrete in figures 1,2 were tested for compressive strength and static modulus of elasticity; three polyurethane concrete samples were included in each group, each sample being a cube of dimensions 20mm by 60 mm. A universal tensile machine (SFMIT, WDW-2H) with a load capacity of 20 tons was used to test the compressive stress strain curve of polyurethane concrete at room temperature. The compression test meets the ASTM 579-01 standard and samples are tested at room temperature at a crosshead speed of 40 MPa/min. The sample was placed 20mm x 20mm face up and testing was started until crushed. The compressive stress response curve is recorded to obtain compressive strength and static elastic modulus.
The polyurethane concrete of fig. 1 behaves like an elastomer. Polyurethane concrete has a lower static elastic modulus and a higher elastic deformation capacity than cement concrete. Referring to the previous polyurethane concrete literature, the compressive stress strain curve of this experiment was divided into three deformation phases before the maximum compressive strain was reached. The first stage is that the strain interval is between 0 and 1% and has the smallest slope. This stage is mainly related to the polyurethane substrate being compacted. The second deformation stage is located at a strain of 1-4% with a greater slope. This is because the pressure resistance is improved after the polyurethane substrate is compacted in the first stage. The third stage is 4-20% due to the fracture of the interface between the polyurethane substrate and the modified glass fiber particles, and therefore the slope gradually decreases until the compressive stress reaches a maximum.
FIG. 2 shows the compressive properties, including compressive strength and static modulus of elasticity, of polyurethane concrete containing different mass fractions of modified glass fiber particles. The result shows that the addition of modified glass fiber particles in polyurethane concrete can effectively improve the static elastic modulus of the material. The static elastic modulus of polyurethane concrete increases with the content of modified glass fiber particles between 0 and 15wt%, and decreases when the content of modified glass fiber particles exceeds 15wt%. The maximum static elastic modulus is 10wt% of the polymer concrete prepared by the modified glass fiber particles, and the static elastic modulus 216.11 +/-13.16 MPa is 39.5% higher than the strength 154.97 +/-11.62 MPa of the pure polyurethane concrete. The reinforcing effect of the modified glass fiber particles is due to the strong interfacial adhesion capability between the polyurethane substrate and the modified glass fiber particles, which limits the segmental motion of the polyurethane substrate. When the content of the modified glass fiber particles exceeds 20wt%, the static elastic modulus is significantly reduced because the aggregation of the filler introduces stress concentration, resulting in a reduction in performance.
Flexural strength and flexural modulus test of samples of polyurethane concrete in fig. 3, 4: prismatic bars of dimensions 10mm by 20mm by 200mm were subjected to a three-point flexural test according to ISO 178:2010 standard. The bars were placed symmetrically on two brackets with a span of 160 mm. The flexural stress strain curve was recorded at a displacement rate of 0.07mm/s at room temperature.
FIG. 3 is a graph showing the compression resistance curves of polymer concrete for an adhesive for polymer concrete. FIG. 4 shows the flexural strength and static elastic modulus of a polymer concrete of an adhesive for polymer concrete. The compressive strength and the flexural strength of the polyurethane concrete of the comparative example are 8.06+ -0.61 MPa and 299.66 + -38.84 MPa, respectively. It is apparent that the flexural strength and flexural modulus significantly increased with the content of the modified glass fiber particles, and that the flexural strength and flexural modulus of the polyurethane concrete reached the maximum when the content of the modified glass fiber particles reached 15wt%. The parameters corresponding to the pure polyurethane concrete are 112.0% and 225.3% higher respectively. When the content of the modified glass fiber particles reaches 20wt%, the modified glass fiber particles start to agglomerate, causing stress concentration, resulting in a decrease in flexural strength and flexural modulus. Notably, the reinforcing effect of the modified glass fiber particles on the flexural strength is significantly greater than the reinforcing effect on the compressive strength. This indicates that the magnitude of the flexural strength is greatly affected by the interaction forces between the particles and the organic substrate. Although the compressive strength of polyurethane concrete is lower than that of cement concrete, the flexural strength of polyurethane concrete is significantly higher than that of cement concrete.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or equivalent embodiments using the method and technical solution disclosed above without departing from the spirit and technical solution of the present invention. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present invention, which do not depart from the technical solution of the present invention, still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The modified glass fiber powder reinforced polyurethane concrete comprises a polyurethane adhesive and aggregate, and is characterized in that the adhesive comprises 5-20wt% of siloxane coupling agent modified glass fiber powder;
the preparation method of the siloxane coupling agent modified glass fiber powder comprises the following steps:
dissolving a siloxane coupling agent in a water/ethanol mixed solution, and uniformly stirring; grinding glass fiber, sieving with 1000 mesh sieve to obtain glass fiber powder, adding into solution, and performing ultrasonic treatment; and (5) after ultrasonic treatment, washing with ethanol and drying to obtain the product.
2. The modified glass fiber reinforced polyurethane concrete according to claim 1, wherein the siloxane coupling agent is used in an amount of 1.9-2.1 wt% based on the mass of the water/ethanol mixed solution.
3. The modified glass fiber reinforced polyurethane concrete according to claim 1, wherein the mass ratio of water to ethanol in the water/ethanol mixed solution is 1:1-1.2.
4. The modified glass fiber powder reinforced polyurethane concrete according to claim 1, wherein the mass ratio of the glass fiber powder to the siloxane coupling agent is 50-55:1.
5. The modified glass fiber reinforced polyurethane concrete of claim 1, wherein the siloxane coupling agent is one of aminopropyl triethoxysilane, gamma- (2, 3-glycidoxy) propyl trimethoxysilane, gamma-methacryloxypropyl trimethoxysilane.
6. The modified glass fiber reinforced polyurethane concrete of claim 1, wherein the adhesive further comprises, in weight percent: 15 to 20 weight percent of 4,4' -methylene-bis (o-chloroaniline), 65 to 70 weight percent of polyoxypropylene ether glycol, 0.1 to 0.3 weight percent of catalyst, 0.25 to 0.75 weight percent of defoamer and 10 to 15 weight percent of polymethylene polyisocyanate.
7. The modified glass fiber reinforced polyurethane concrete according to claim 6, wherein the catalyst is bismuth isooctanoate and the defoamer is
-6019; the polymethylene polyisocyanate is at least one of polymethylene polyarylisocyanate, polyphenyl polymethylene polyisocyanate and polymethylene polyphenyl polyisocyanate, wherein the NCO functionality is 2.5-3, and the content of NCO is 30-40% measured by a toluene-di-n-butylamine titration method.
8. The modified glass fiber reinforced polyurethane concrete according to claim 6 or 7, wherein the preparation method of the adhesive comprises the following steps:
mixing 4,4' -methylene-bis (o-chloroaniline), polyoxypropylene ether glycol, a catalyst and a defoaming agent, and stirring in a flask at 80 ℃ under nitrogen atmosphere for 0.8-1.2h; cooling the mixture, storing and sealing in a container for later use; adding siloxane modified glass fiber powder, and uniformly stirring; then evenly mixing with polymethylene polyisocyanate; injecting into a mold, and curing at room temperature to obtain the polyurethane adhesive.
9. A modified glass fiber reinforced polyurethane concrete according to any one of claims 1 to 8, comprising, in parts by weight: 25-35 parts of polyurethane adhesive and 65-75 parts of aggregate.
10. The method for preparing the modified glass fiber reinforced polyurethane concrete as claimed in claim 9, which is characterized by comprising the following steps:
and (3) uniformly mixing the polyurethane adhesive and the aggregate, injecting the mixture into a mold, demolding and curing to obtain the polyurethane adhesive.
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| CN117567124A (en) * | 2023-11-17 | 2024-02-20 | 青岛德辰新材料科技有限公司 | Green inorganic toughness TBM wall post-grouting material and application thereof |
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