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Silica sand composition, formed body and preparation method for formed body

A technology for a composition and a formed body, which is applied in the field of silica sand composition and formed body and the preparation of the formed body, can solve the problem that the strength retention rate needs to be further improved, and achieves easy popularization and application, strong operability, and improved strength. Effect

Active Publication Date: 2012-05-16
RENCHSAND ECO ENVIRONMENT PROTECTION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the silica sand can be firmly bonded together by using an organic binder, and then a molded body with good strength can be obtained, the molded body thus obtained needs to be further improved in terms of strength retention.

Method used

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  • Silica sand composition, formed body and preparation method for formed body

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Embodiment approach

[0038] According to one embodiment of the present invention, the polyurethane adhesive contains isocyanate and polyol. The isocyanate and the polyol can exist separately, and the two are mixed and reacted during use to form a urethane bond, and then form a polyurethane cross-linked structure to realize the function of bonding; it is also possible to use the isocyanate group with End-capping agent (for example: one or more in phenol, cresol, nonylphenol, caprolactam and methyl ethyl ketone) is carried out protection and exists in a closed and moisture-insulated environment with described polyhydric alcohol, during use Under the condition of elevated temperature (for example: 140-180 ℃), the blocking agent is removed, and the isocyanate group is released to react with the hydroxyl group in the polyol to form a urethane bond, and then form a polyurethane cross-linked structure to achieve adhesion. Function.

[0039] In this embodiment, the molar ratio of the isocyanate group in ...

Embodiment 1

[0082] This example is used to illustrate the silica sand composition, permeable brick and preparation method thereof according to the present invention.

[0083] (1) Preparation of silica sand with polymer coating

[0084] With 16g epoxy resin (wherein, 12g is the epoxy resin that the trade mark that Wuxi Resin Factory produces is the epoxy resin of E-51, and epoxy value is 0.473mol / 100g; 4g is that the trade mark purchased from Shanghai Resin Factory Co., Ltd. is ME-2 and Hydrophilic epoxy resin with an epoxy value of 0.376mol / 100g), 15g of titanium dioxide (manufacturer: DuPont, brand: R-902) successively added to a temperature of 120°C and 2kg of silica sand (average particle diameter of 3mm) in a stirred tank, after stirring for 3 minutes, add 4g of grade 593 epoxy resin curing agent (manufacturer: Wuxi Huilong Electronic Materials Co., Ltd.) at 100°C and continue to stir for 5 minutes at 100°C, cool To 25 DEG C, the silica sand with the polymer coating is obtained. By t...

Embodiment 2

[0090] This example is used to illustrate the silica sand composition, permeable brick and preparation method thereof according to the present invention.

[0091] (1) Preparation of silica sand with polymer coating

[0092] Adopt the method identical with embodiment 1 to prepare the silica sand with polymer coating layer, difference is that the consumption of epoxy resin is 80g (wherein, 60g is the epoxy resin that the trade mark that Wuxi Resin Factory produces is E-44, and this The epoxy value of epoxy resin is 0.461mol / 100g; 20g is the hydrophilic epoxy resin of ME-2 and epoxy value 0.376mol / 100g for the trade mark purchased from Shanghai Resin Factory Co., Ltd., epoxy resin curing The consumption of agent is 20g, by weight-gain method, calculate, take the total amount of the silica sand with polymer coating as a benchmark, the content of polymer coating is 5% by weight, and curing degree is 88%.

[0093] (2) Preparation of permeable bricks

[0094] The same method as in ...

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Abstract

The invention provides a silica sand composition which comprises silica sand having a polymer coating and a first binder, wherein, the polymer coating is a cured second binder, and the first binder and the second binder are respectively one or more selected from the group consisting of an acrylic acid resin adhesive, an epoxy resin adhesive and a polyurethane adhesive. The invention also provides a preparation method for a formed body and the formed body prepared by using the method. The method comprises the steps of mixing of all the components of the silica sand composition, molding and curing of the first binder. The formed body prepared from the composition by using the method has good water permeability, high strength and an excellent strength retention rate, and has a compressive strength of 45 to 70 MPa when in a dry state, a compressive strength of 28 to 55 MPa when in a wet state, a cyclic strength of 20 to 45.5 MPa after 5 cycles, a strength loss rate of only 27 to 60% and a permeability coefficient of 3 to 7 cm / s.

Description

technical field [0001] The invention relates to a method for preparing a silica sand composition and a molded body and the molded body prepared by the method. Background technique [0002] At present, the global freshwater resources are becoming increasingly scarce, and scientifically and rationally obtaining and utilizing water resources is becoming an increasingly important research topic. [0003] Rainwater is one of the important ways for human beings to obtain fresh water resources. However, the cities where human beings live are mainly paved with impermeable materials such as granite, marble, glazed bricks, cement and asphalt, such as city squares, commercial streets, sidewalks, community activities and Surrounded by hardened ground such as parking lots. When it rains, the hardened ground completely prevents rainwater from seeping directly into the ground, resulting in water accumulation on the road, which not only hinders people's travel, but also the precious fresh ...

Claims

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Application Information

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IPC IPC(8): C04B26/04C04B26/10C04B26/16C04B14/06
Inventor 秦升益秦申二李欢欢贾屹海
Owner RENCHSAND ECO ENVIRONMENT PROTECTION SCI & TECH CO LTD
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