Mortar containing polyurethane dispersion with ethylene oxide units

A technology of polyurethane dispersion and ethylene oxide, which is applied in the field of mortar containing polyurethane dispersion with ethylene oxide units, can solve the problems of inconvenient construction site treatment and the like, and achieve good water impermeability, easy handling, good performance effect

Active Publication Date: 2020-03-17
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But carbodiimides are hazardous substances which are not easy to handle on construction sites

Method used

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  • Mortar containing polyurethane dispersion with ethylene oxide units
  • Mortar containing polyurethane dispersion with ethylene oxide units
  • Mortar containing polyurethane dispersion with ethylene oxide units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0201] The following examples illustrate the invention without limiting it.

[0202] "Standard climate" means a temperature of 23 ± 1° C. and a relative atmospheric humidity of 50 ± 5%. "Nc" means "standard climate".

[0203] 1. Nonionic polyurethane dispersion:

[0204] PUD-N1:

[0205] 50.88 parts by weight of water were placed in a round bottom flask at a temperature of 17°C. Subsequently 28.4 parts by weight of the isocyanate-functional polyurethane polymer P1 prepared as described below, which had a temperature of 50° C., were added with good stirring while forming a milky dispersion. Immediately thereafter, 12.72 parts by weight of ice (frozen water) was added with good stirring, followed by 8.00 parts by weight of 20 wt% (2-methylpentamethylenediamine from Invista). The dispersion was stirred for another 30 minutes.

[0206] The obtained water-based polyurethane dispersion is a milky white fluid containing about 70 wt% water, 24.9 wt% chain-extended polyurethane...

Embodiment M-1

[0221] Embodiments M-1 to M-6:

[0222]For each example, liquid component A was prepared separately by mixing parts by weight of the ingredients according to Table 1. Each Component A was stored in a sealed polyethylene bottle where it was storage stable.

[0223] By blending 32.8 parts by weight of Portland cement CEM I 42.5N / SR, 63.6 parts by weight of quartz sand with a diameter of 0.1 to 2mm, 0.8 parts by weight of calcium oxide powder, 0.7 parts by weight of silica fume, 0.1 parts by weight of 6mm Long polypropylene fibers and 2 parts by weight of other mortar additives were used to prepare Component B in solid granular form. Component B is stored in sealed drums where it is storage stable. It was used in Examples M-1 to M-6.

[0224] The repair mortars of Examples M-1 to M-6 were mixed by blending each of Component A and Component B in the mixing ratio given in Table 1, and mixed within 3 minutes using a Hobart-mixer to form a homogeneous quality fresh mortar. Eac...

Embodiment M-7 and M-8

[0243] For each example, liquid component A was prepared by blending 60.0 parts by weight of PUD-N1 or PUD-N2 according to Table 3, 39.5 parts by weight of water, and 0.5 parts by weight of mortar additives, respectively. Each Component A was stored in a closed polyethylene bottle where it was storage stable.

[0244] By adding 6.0 parts by weight of Portland cement CEM I 52.5R, 63.0 parts by weight of quartz sand with a diameter of 0.1 to 0.3 mm, 20.0 parts by weight of redispersible ethylene-vinyl acetate powder, and 4.2 parts by weight of calcium carbonate Filler, 3.5 parts by weight of metakaolin, 2.5 parts by weight of silicon powder and 0.8 parts by weight of additives were blended to prepare component B in solid granular form. Component B is stored in sealed drums where it is storage stable. It was used in Examples M-7 and M-8.

[0245] The waterproof mortars of Examples M-7 and M-8 were mixed by blending each Component A with Component B in the mixing ratios given in...

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Abstract

The present invention relates to a composition comprising: at least one water-based polyurethane dispersion containing ethylene oxide units, at least one cement, and at least one mineral filler. The composition can be mixed and applied without coagulation of the polyurethane dispersion. Upon curing, it has a high strength and good adhesion properties, with surprisingly low shrinkage and most surprisingly good water impermeability properties. The composition is particularly suitable for the use as repair mortar, waterproofing mortar or screed mortar.

Description

technical field [0001] A polymer-modified cement-based mortar with good waterproof performance is particularly suitable as repair mortar, waterproof mortar or screed mortar. [0002] Background of the invention [0003] Ordinary cement mortars are usually improved by introducing non-reactive polymers into the cement matrix. Typical polymers are thus acrylics, styrene acrylics, vinyl or vinylidene acetates, ethylene vinyl acetate and styrene butadiene copolymers. These polymers are used in the form of water-based dispersions or as redispersible powders, which are usually obtained by spray-drying the corresponding dispersions. Such polymer-modified mortars are generally easy to apply and are harmless. However, although polymers improve the performance of ordinary cement mortars, the performance of such polymer-modified mortars is still far inferior to that of cement-based products containing reactive polymers, such as epoxy resins such as in (from Sika), or polyurethanes co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B28/02
CPCC04B24/282C04B28/02C04B2103/006C04B2111/00293C04B2111/27C04B2111/60C04B2111/72C04B14/043C04B14/06C04B14/26C04B14/28C04B14/303C04B14/368C04B24/26C04B40/065C04B18/146C04B24/2635C04B28/04C04B28/14
Inventor C·埃文斯I·马丁Y·帕多斯R·加西亚L·格拉尼佐
Owner SIKA TECH AG
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