CN1781866A - Polymer modified cement - Google Patents

Abstract

The polymer modified cement is mixture comprising cement 35-45 wt%, quartzite 27-40 wt%, stone powder 20-35 wt%, fine ore slag powder 2-6 wt%, flexible dispersible glue powder 1-3 wt%, hydrophobic dispersible glue powder 1-2 wt%, polypropylene fiber 0.3-0.5 wt% and hydromellose 0.1-0.5 wt%. It is used as the excellent plastering material for wall surface in building, and may be adhered firmly with cement mortar, concrete, aerated concrete, foamed polystyrene board, etc.

Description

Polymer-modified cement

Technical field

The present invention relates to building masonry wall skin layer plastering material, specifically a kind of polymer-modified cement.

Background technology

Building Trade in China had entered Rapid development stage in recent years, and at present the residential housing structure of China as: high-rise and little high level all is based on shear wall and frame-shear structure.Along with applying and the raising of operating technique of large form, concrete surface after the demoulding is generally all comparatively smooth, therefore when doing the rendering layer construction, just produced the adhesion problem of sand-cement slurry and smooth concrete base layer, the thickness of general rendering layer is all very thick, that have even thick in 50-60mm, thickness increases and the expansion difference in shrinkage of two kinds of materials can cause stress, if cohesive force is very low between sand-cement slurry and the concrete, will inevitably cause sand-cement slurry rendering layer hollowing to flake, cause serious quality accident, even jeopardize personnel safety.This thick constructional method of plastering, in China's building trade, still generally adopting at present, but abroad for example: the U.S., Canada, Europe and Singapore etc. have all adopted the advanced direct plastering technique of thin layer (in the directly batch embedding of structural sheet surface, thickness is below 5mm).

In addition; China is wideling popularize building energy conservation; widely popularize by the external thermal insulation system that plastic extrusion heated board (XPS), polystyrol plastic foam plate (EPS) are formed; wherein the sealer of plastic extrusion heated board (XPS), polystyrol plastic foam plate (EPS) plays crucial effects to whole outer heat preservation system; and traditional thick matter sand-cement slurry is plastered and is caused infiltration owing to its fragility will cause the crack, if through the multigelation circulation whole external thermal insulation system will be destroyed again.For this reason, development is the task of top priority in concrete basic unit and polystyrol plastic foam plate (EPS) surface with the polymers of excellent properties modified cement.

Summary of the invention

A kind of powdery flexible anti rimose polymer-modified cement of providing at the deficiencies in the prior art is provided, it and basic unit's bondings such as sand-cement slurry, concrete, gas concrete, polystyrol plastic foam plate (EPS), plastic extrusion heated board (XPS) and thermal insulation mortar are firmly, no hollowing flakes and ftractures, can in porous dry basic unit, construct, nontoxic, easy construction, no seam lap, long service life.

The concrete technical scheme that realizes the object of the invention is:

A kind of polymkeric substance sex change cement, it is mixed by following component, and its weight percent is:

Cement 35-45%

Quartz sand 27-40%

Stone flour 20-35%

Slag micropowder 2-6%

Flexible re-dispersible glue powder 1-3%

Hydrophobic re-dispersible glue powder 1-2%

Polypropylene fibre 0.3-0.5%

Vltra tears 0.1-0.5%.

Beneficial effect of the present invention:

1, with sand-cement slurry, concrete, gas concrete, polystyrol plastic foam plate (EPS) plate, plastic extrusion heated board (XPS), and basic unit such as thermal insulation mortar, bonding firmly, no hollowing flakes and ftracture.

2, intensity does not have obvious decline in the energy long period of soaking water.

3, the wet flow density of water vapour 〉=1.0.

4, have flexible preferably (can prevent＜generation of 0.1mm microscopic checks).

5, can in porous dry basic unit, construct.

6, nontoxic, easy construction, no seam lap.

7, work-ing life＞15 year.

Embodiment

Embodiment

To produce 100 kilograms of the present invention is example

Getting 0.1 kilogram of 40 kilograms of 32.5R silicate cement, 30 kilograms of 50 purpose quartz sands, 22 kilograms of stone flours, 4 kilograms of slag micropowders, 1.5 kilograms of flexible re-dispersible glue powders (vinyl acetate-ethylene copolymerization), 2 kilograms of hydrophobic re-dispersible glue powders (silicone resin), 0.4 kilogram of polypropylene fibre, Vltra tears is placed on to mix in the Agravicmixer and can packs (leatheroid bag) in 5 minutes.

The present invention is light grey powder, and the time spent only need add water and it is stirred get final product.

Cement is gelling material among the present invention, and forming a basic bonding aggregate with quartz sand is the main body of thin layer plastering material.The effect of acrylic fibre mainly is the tensile strength that improves material, and absorbs and disperse because the plastic shrinkage that cement produces in hydration process, drying shrinkage and the temperature difference formed stress when shrinking.Thereby can prevent fissured generation effectively, play the cracking resistance effect.Re-dispersible glue powder can be dispersed in the material admirably, when adding the water stirring, these polymer glue powders can have flexible macromolecule resin with cement, sand and fine aggregate surface parcel one deck, and formation external phase and network-like structure, thereby the fragility of material is greatly improved, makes it become hard and soft bonded thin layer plastering material.In order to improve its application property, particularly in summer high temperature and porous, exsiccant basic unit, construct, make moisture content be difficult for overflowing, make fully hydration reaction of cement, selected for use to have the quite excellent water-holding agent hydroxypropyl methylcellulose of water retaining function for this reason.And the adding of active breeze (slag micropowder), mainly be make it can with C in the cement ₃S ₁, C ₂The Ca (OH) that the S aquation produces reacts, and can further improve the surface structure of hardenite, the material degree of compactness is improved, thereby can improve its shearing resistance cohesive strength.

Construction procedure

1, basic level requirement

Basic unit should clean, not have floating ash and can influence other foreign material of adhesive fastness, and basic unit should not have open fire.

2, batch mixing stirs

Water cement ratio 1: 4 (1 part of water, 4 parts of dry powder) stirs it with portable stirrer.

3, construction

Divide the substrate surface (can carry out in the time of need treating the first road surface drying when smearing second road) that is put on the floating or protection of needs for 2-3 time with the mud plate.

4, thickness requirement

Look Base Smoothness and different, generally at concrete, the about 3-5mm of sand aerated concrete block its thickness of surface, about polystyrol plastic foam plate (EPS), the generally about 3mm of plastic extrusion heated board (XPS) substrate surface.

5, precaution

1, construction temperature must not be lower than 5 ℃;

2, hot weather construction should be avoided constructing under the sunlight direct projection;

When 3, summer, outdoor construction and basic unit were dry, basic unit's water that need wet;

Be sure not construction when 4, raining;

5, maintenance: after construction finishes, can in physical environment, maintenance get final product more than 7 days.

Claims (1)

1, a kind of polymkeric substance sex change cement is characterized in that it is mixed by following component, and its weight percent is:

Cement 35-45%

Quartz sand 27-40%

Stone flour 20-35%

Slag micropowder 2-6%

Flexible re-dispersible glue powder 1-3%

Hydrophobic re-dispersible glue powder 1-2%

Polypropylene fibre 0.3-0.5%

Vltra tears 0.10.5%.