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Polyurethane cement mortar and preparation method thereof

A cement mortar and polyurethane technology, used in building materials and chemical fields, can solve the problems of large shrinkage deformation, impermeability, poor crack resistance and corrosion resistance, high density, etc., and achieve high elongation and small volume shrinkage. , The effect of strong anti-deformation ability

Inactive Publication Date: 2013-12-04
安徽省思维新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary mortar has a low tension-compression ratio, large dry shrinkage deformation, poor impermeability, crack resistance, corrosion resistance, and high density, so its application range is greatly limited.

Method used

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  • Polyurethane cement mortar and preparation method thereof

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Effect test

Embodiment 1

[0023] The polyurethane cement mortar of this embodiment comprises, by weight, 50 parts of Portland cement, 100 parts of 30-150 mesh fine sand, 10 parts of water, 1.5 parts of calcium formate, 0.9 part of sulfonated melamine formaldehyde, and 20 parts of one-component polyurethane The one-component polyurethane includes isocyanate, polyether 220, polyether 330, catalyst and solvent, and the molar ratio of isocyanate: polyether 220: polyether 330: catalyst: solvent is 4:1:2:0.0045:20.

[0024] The isocyanate in this embodiment is polymethylene polyphenyl polyisocyanate PAPI.

[0025] The method that present embodiment prepares polyurethane cement mortar, comprises the following steps:

[0026] (1) Heat polyether 220 and polyether 330 to 110°C, dehydrate under 0.06MPa vacuum for 2 hours, and when the mass fraction of polyether moisture is measured to be below 0.05%, cool down to 40°C to obtain a dehydrated mixed polyether ;

[0027] (2) Slowly add PAPI to the dehydrated mixed ...

Embodiment 2

[0034] The polyurethane cement mortar of this embodiment, by weight, includes 70 parts of sulfoaluminate cement, 140 parts of fine sand of 30-150 mesh, 35 parts of water, 6 parts of early strength agent, 2.4 parts of water reducing agent, one-component polyurethane 25 parts; the one-component polyurethane includes isocyanate, polyether 220, polyether 330, catalyst and solvent, and the molar ratio of isocyanate: polyether 220: polyether 330: catalyst: solvent is 2:3:3:0.0015:16 .

[0035] The method that present embodiment prepares polyurethane cement mortar, comprises the following steps:

[0036] (1) Heat polyether 220 and polyether 330 to 120°C, dehydrate under 0.08MPa vacuum for 3 hours, and when the measured polyether moisture content is below 0.05%, cool down to 50°C to obtain a dehydrated mixed polyether ;

[0037] (2) Slowly add liquefied MDI into the dehydrated mixed polyether prepared in step (1), under the protection of nitrogen, add the catalyst dibutyltin dilaura...

Embodiment 3

[0043] The polyurethane cement mortar of this embodiment comprises, by weight, 60 parts of sulfate cement, 120 parts of 30-150 mesh fine sand, 25 parts of water, 3 parts of early strength agent, 1.6 parts of water reducing agent, and 22 parts of one-component polyurethane The one-component polyurethane includes isocyanate, polyether 220, polyether 330, catalyst and solvent, and the molar ratio of isocyanate: polyether 220: polyether 330: catalyst: solvent is 3:2:2.5:0.003:18.

[0044] The method that present embodiment prepares polyurethane cement mortar, comprises the following steps:

[0045] (1) Heat polyether 220 and polyether 330 to 115°C, dehydrate under 0.07MPa vacuum for 2.5 hours, and when the mass fraction of polyether moisture is measured to be below 0.05%, cool down to 45°C to obtain a dehydrated mixed poly ether;

[0046] (2) Slowly add toluene diisocyanate into the dehydrated mixed polyether prepared in step (1), under the protection of nitrogen, drop in the cat...

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Abstract

The invention discloses polyurethane cement mortar and a preparation method thereof. The polyurethane cement mortar comprises the following materials: 50 to 70 parts of cement, 100 to 140 parts of 30 to 150 meshes' silver sand, 10 to 35 parts of water, 1.5 to 6 parts of early strength agent, 0.9 to 2.4 parts of water-reducing agent, and 20 to 25 parts of one-component polyurethane, wherein the one-component polyurethane comprises isocyanate, polyether 220, polyether 330, catalyst and solvent. The invention further discloses the corresponding preparation method which comprises the following steps: leading a small quantity of polyurethane resin in cement mortar, uniformly dispersing the cement mortar in the cement substrate, and carrying out hydration of cement and solidification of polyurethane simultaneously to form an integral structure through mutual filling. The polyurethane cement mortar prepared according to the preparation method overcomes the defects of large air shrinkage deformation, poor impermeability, crack resistance and corrosion resistance, high density and the like of common mortar which is low in tension or compression ratio, and has the excellent performances of high freezing resistance, leakage resistance, corrosion resistance, ductility ratio, and deformation resistance, low volume shrinkage ratio, and the like.

Description

technical field [0001] The invention relates to a chemical and construction material, in particular to a polyurethane cement mortar and a preparation method thereof. Background technique [0002] Ordinary mortar has a low tension-compression ratio, large dry shrinkage deformation, poor impermeability, crack resistance, corrosion resistance, and high density, so its application range is greatly limited. With the development of industry, to further improve the performance of mortar, it is necessary to improve the performance of cementing materials, so polymer mortar appeared. Use polymers to modify cement mortar so that while maintaining the advantages of the original inorganic materials of cement, such as compressive strength, flexural strength, and aging resistance, organic materials with strong cohesive force, good deformability, and strong sealing are added. characteristics, so that the cohesive force, frost resistance and impermeability of cement mortar have been greatly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B24/32
Inventor 胡先海罗俊杰
Owner 安徽省思维新型建材有限公司
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