Plastering-free mechanically-sprayed putty powder, plastering-free mechanically-sprayed putty slurry as well as preparation method and application thereof

Abstract

The invention provides plastering-free mechanically-sprayed putty powder, plastering-free mechanically-sprayed putty slurry as well as a preparation method and application thereof. The plastering-freemechanically-sprayed putty powder is prepared from the following components in percentage by weight: 25.0-35.0% of an inorganic cementing material, 35.0-50.0% of aggregate, 10.0-30.0% of a filler, 1.0-3.0% of alkali-resistant additives, 3.0-5.0% of redispersible latex powder, 0.2-0.4% of hydroxypropyl methyl cellulose ether, 0.2-0.3% of anti-cracking fiber, 0.1-0.3% of a thixotropic agent, 0.05-0.15% of a water reducer and 0.01-0.05% of a water-repellent agent. The prepared plastering-free mechanically-sprayed putty has excellent bonding strength, cracking resistance, flexibility, water resistance, alkali resistance, efflorescence resistance and droop resistance, spraying constructability and scraping constructability, so that the construction efficiency is greatly improved, the construction period is shortened, and the labor cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a plaster-free machine spray putty powder, a plaster-free machine spray putty slurry and a preparation method and application thereof. Background technique [0002] Based on the advantages of stable quality, short construction period, less pollution, and strong market competitiveness, plaster-free building walls are an inevitable trend in the development of high-rise buildings in the future. The new plaster-free walls at this stage mainly include the all-concrete exterior wall plaster-free system, PC prefabricated panels and new walls of the passive house exterior decoration system. The all-concrete exterior wall plaster-free system has high wall density, good flatness, and convenient construction. It has been widely used in Vanke and other major real estates. However, since the entire concrete wall is made of demoulding, there are mold release agent residues on the sur...

AI Technical Summary

Problems solved by technology

However, since the entire concrete wall is made of demoulding, there are mold release agent residues on the surface, and there are cavities of different sizes. In the subsequent coating construction, the anti-bubbling ability and adhesion of putty leveling materials There are extremely high requirements. The existing conventional putty products on the market are directly applied to the full concrete wall, which is easy to cause bubbling, cracking or even peeling off. The existing construction technology usually needs to use an interface agent for surface treatment first, and then use High-adhesion leveling materials can be used for putty construction after rough leveling of the formwork wall. The process is cumbersome, the cycle is long, and the cost is high

[0003] With the rapid development of prefabricated buildings, the integration of exterior wall coating is also a major trend in future development. However, the existing exterior wall putty cannot satisfy the coating effects of flat coating, texture, color, and real stone paint at the same time. It is necessary to select the bottom layer matching putty according to the final finishing effect, which has great restrictions in use and poor versatility; at the same time, the existing conventional exterior wall putty products are often accompanied by the problem of wall efflorescence after construction. To a certain extent, it affects the finishing safety of later coatings, and also restricts the possibility of conventional putty and different coatings.

[0004] In addition, due to the advantages of high efficiency, convenience, and controllable quality, spraying construction has been widely used in the field of building interior walls. According to statistics, compared with manual painting, the efficiency of spraying construction can be significantly increased by 1.5-2 times; In the field of walls, the application of spraying construction is not widespread. The reason is that, apart from subjective factors such as construction habits, the main reason is that the formula design and raw material gradation of conventional exterior wall putty products are not tailored for mechanized spraying and cannot be taken into account at the same time. Product performance and construction progress

[0005] Although both CN 103342506 B and CN 107555911 A disclose putty sprayed by external wall machines, the anti-bubbling ability and adhesion of the two cannot meet the requirements of new-style building exterior walls such as full concrete walls without plastering, and cannot effectively solve the problem. The problem of efflorescence on the wall also has serious restrictions on the use of different coatings

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