Waterproof structure with high crack resistance and high fatigue resistance

Abstract

The invention discloses a high-crack-resistance and high-fatigue-resistance waterproof structure, belongs to the technical field of building waterproofing, and overcomes the defects that an existing single waterproof coating is poor in crack resistance and fatigue resistance when a stress failure effect is generated due to dynamic change of base layer cracks. A permeable emulsion layer, polyester cloth, an emulsion coating layer and a waterproof coating layer are sequentially arranged on the outer surface of a cement base layer. And the emulsion coating layer is formed by brushing pure acrylic emulsion with small particle size, medium viscosity and high water resistance. And the waterproof coating layer is formed by brushing polymer cement waterproof coating. The waterproof structure is provided with a plurality of waterproof layers, has high crack resistance and high fatigue resistance when stress damage is generated due to dynamic change of cracks of a cement base layer, and is mainly used for building waterproofing.

Description

Technical Field

[0001] This invention belongs to the field of building waterproofing technology, specifically referring to a waterproof structure with high crack resistance and high fatigue resistance. Background Technology

[0002] Currently, the main waterproofing coatings used in bathrooms, kitchens, and balconies include polyurethane waterproofing coatings, polymer cement waterproofing coatings, and self-healing waterproofing coatings. When the foundation of a new house settles, and as the house ages, the cement base layer may crack and settle due to temperature differences, aging, vibration, and other factors. The magnitude and direction of stress generated by dynamic cracking in the cement base layer are random, and the width of the cracks also changes dynamically. This characteristic places stringent requirements on the crack resistance, tensile strength, and compressive fatigue resistance of the waterproofing coating. General waterproofing coatings, such as polymer cement waterproofing coatings, have a certain degree of flexibility in a single waterproofing layer, but their fatigue resistance is poor and their elongation is limited. Under the repeated stress generated by the dynamic changes in the cement base layer, they are easily subjected to tensile, compressive, and compressive stresses, leading to damage. While self-healing waterproofing coatings can repair cracks less than 0.5mm wide in a single waterproofing layer, their repair effectiveness is questionable under dynamic crack changes, and their poor fatigue resistance makes them prone to re-cracking. Therefore, waterproofing products with high crack resistance and high fatigue resistance are needed to address water leakage caused by dynamic changes in cracks. Summary of the Invention

[0003] The purpose of this invention is to provide a waterproof structure with multiple waterproof layers, exhibiting high crack resistance and high fatigue resistance when stress failure occurs due to dynamic changes in cracks in the cement substrate, primarily for building waterproofing. This invention is achieved through the following technical solution: a waterproof structure with high crack resistance and high fatigue resistance, comprising a cement substrate, on the outer surface of which are sequentially disposed a penetrating emulsion layer, a polyester fabric, an emulsion coating layer, and a waterproof coating layer.

[0004] The aforementioned penetrating emulsion layer refers to the adhesive layer formed when the emulsion coating is applied to the polyester fabric and then penetrates under the polyester fabric to form a penetrating emulsion and cement base layer.

[0005] The polyester fabric mentioned is one of the following: non-woven fabric, woven polyester fabric, and cleanroom fabric.

[0006] The polyester fabric mentioned refers to a polyester fabric coated with an emulsion paint, which the polyester fabric absorbs.

[0007] The emulsion coating layer is formed by applying a layer of pure acrylic emulsion with small particle size, medium viscosity, and high water resistance.

[0008] The waterproof coating layer is a polymer cement waterproof coating applied in layers.

[0009] Compared with the prior art, the present invention has the following beneficial technical effects:

[0010] 1. After the polyester fabric absorbs the emulsion coating, the polymer material in the emulsion also encapsulates the polyester fabric, which also has a waterproof function. The polyester fabric also acts as a waterproof layer, forming a multi-layer waterproof layer together with the emulsion coating layer and the waterproof coating layer.

[0011] 2. Settlement joints in cement substrates, caused by various reasons, typically have a settlement angle within 10° relative to the horizontal plane. In experiments, this invention was applied to a cement mortar board, and after drying and curing, a crack was pressed into the middle of the mortar board. One end of the mortar board was fixed, and the other end was pressed downwards to simulate cement substrate settlement. The invention only cracked and broke when the settlement angle reached 180° relative to the horizontal plane. Therefore, in practical applications, this invention has very strong crack resistance in ordinary cement substrate settlement joints. The crack acts on the polyester fabric after absorbing the emulsion coating, and the polyester fabric plays a role in isolating most of the stress damage from the crack.

[0012] 3. Apply this invention to a cement mortar board. After drying and curing, press a crack in the middle of the mortar board. The coating remains intact when the crack occurs. With an average crack width of 0.5mm, the mortar board is placed in the fatigue tensile testing machine and clamped. The cycle speed is set to 1Hz. The joint deformation capacity is tested for 5000 cycles without damage to the waterproof coating.

[0013] 4. This invention improves the waterproof coating's resistance to repeated stress, compression, and damage under dynamic changes in substrate cracks, reduces the incidence of cracking and leakage in the waterproof coating, and greatly enhances the waterproofing effect compared to existing single waterproof coatings.

[0014] 5. This invention is applicable to waterproofing in bathrooms, kitchens, balconies, and other areas inside buildings, and does not change the usual waterproofing coating application practices. Attached Figure Description

[0015] Figure 1 This is a layered diagram of the waterproof structure of the present invention.

[0016] In the diagram: 1. Cement base layer; 2. Penetrating emulsion layer; 3. Polyester fabric; 4. Emulsion coating layer;

[0017] 5. Waterproof coating layer. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 The present invention will be further described in detail with reference to specific embodiments.

[0019] Figure 1 This is a diagram of the waterproof structure of the present invention. As can be seen from the diagram, it includes a cement base layer 1, and on the outer surface of the cement base layer 1, a penetrating emulsion layer 2, a polyester cloth 3, an emulsion coating layer 4, and a waterproof coating layer 5 are sequentially arranged.

[0020] The aforementioned penetrating emulsion layer 2 refers to the layer formed by the penetration of the emulsion coating under the polyester fabric 3 after it is applied to the polyester fabric 3, thus forming an adhesive layer between the penetrating emulsion and the cement base layer 1.

[0021] The polyester fabric 3 is one of non-woven fabric, sewn polyester fabric, and cleanroom fabric.

[0022] The polyester fabric 3 refers to the polyester fabric 3 on which the emulsion coating is applied, and the polyester fabric 3 absorbs the emulsion coating.

[0023] The emulsion coating layer 4 is formed by applying a layer of pure acrylic emulsion with small particle size, medium viscosity, and high water resistance.

[0024] The waterproof coating layer 5 is a polymer cement waterproof coating applied in layers.

[0025] A specific embodiment is as follows: After laying polyester fabric 3 on the cement base layer 1, an acrylic emulsion is applied to the polyester fabric 3. The polyester fabric 3 absorbs the acrylic emulsion, which has high permeability and moisture-permeable properties. After being applied to the polyester fabric 3, the emulsion seeps under the polyester fabric 3 to form a penetrating emulsion layer 2, which adheres to the cement base layer 1. After the acrylic emulsion on the polyester fabric 3 dries, an emulsion coating layer 4 is formed. A polymer cement waterproof coating is applied to the emulsion coating layer 4. After the polymer cement waterproof coating dries, a waterproof coating layer 5 is formed. Thus, the cement base layer 1, the penetrating emulsion layer 2, the polyester fabric 3, the emulsion coating layer 4, and the waterproof coating layer 5 are bonded together to form a waterproof structure with high crack resistance and high fatigue resistance.

[0026] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, those skilled in the art can make various modifications or additions to the specific embodiments or use similar methods to replace them. Equivalent changes made to the structure, shape, and principle of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A waterproof structure with high crack resistance and high fatigue resistance, comprising a cement base layer, characterized in that: The outer surface of the cement base layer is sequentially provided with a penetrating emulsion layer, a polyester cloth, an emulsion coating layer and a waterproof coating layer.

2. The waterproof structure with high crack resistance and high fatigue resistance according to claim 1, characterized in that: The penetrating emulsion layer refers to the adhesive layer formed by the penetration of the emulsion coating to the polyester cloth after the emulsion coating is coated on the polyester cloth.

3. The waterproof structure of claim 1, wherein: The polyester cloth is one of non-woven cloth, sewn polyester cloth and dust-free cloth.

4. The waterproof structure of claim 1, wherein: The polyester cloth refers to the polyester cloth that absorbs the emulsion coating after the emulsion coating is coated on the polyester cloth.

5. The waterproof structure of claim 1, wherein: The emulsion coating layer is formed by brushing the pure acrylic emulsion with small particle size, medium viscosity and high water resistance.

6. The waterproof structure of claim 1, wherein: The waterproof coating layer is formed by brushing the polymer cement waterproof coating.

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