Processing method of concrete moisturizing and curing non-woven fabric

Abstract

The invention relates to the related field of curing non-woven fabrics, in particular to a processing method of concrete moisturizing and curing non-woven fabrics, which is used for surface moisturizing and curing of concrete, bridges, buildings and the like, and is mainly characterized in that PP (polypropylene) spun-bonded non-woven fabrics and PE (polyethylene) films or PP films are compounded through powder scattering, and then the concrete moisturizing and curing non-woven fabrics are formed. A certain proportion of SAP superabsorbent powder is mixed in the middle of the composite layer, moisture evaporation is prevented through water insulation of a PP or PE film, the SAP superabsorbent powder of the middle layer maintains the humidity of the surface, making contact with concrete, of the inner layer under the effect of sufficient water absorption, the curing purpose is achieved, the SAP superabsorbent powder can keep moisture for a long time after water absorption, the moisture can be kept for 10-14 days after water is added once, and the curing effect is good. The concrete surface curing effect is ensured.

Description

Technical Field

[0001] The present invention relates to the field of non-woven fabrics for maintenance, and specifically to a processing method for non-woven fabrics for concrete moisture conservation and maintenance. Background Art

[0002] In recent years, with the development and progress of science and technology, the application environment of building bridges and concrete requires the maintenance of concrete. Concrete maintenance is to artificially create certain humidity and temperature conditions to enable the freshly poured concrete to harden normally or accelerate its hardening and strength growth. The reason why concrete can gradually harden and increase in strength is the result of the hydration of cement, and the hydration of cement requires certain temperature and humidity conditions. If such conditions do not exist in the surrounding environment, then artificial maintenance of concrete is required. Concrete maintenance methods include: First, natural maintenance: divided into sprinkler maintenance and spraying plastic film maintenance. In the former, the concrete is covered with straw curtains and the like, and water is often sprinkled to keep it moist. The maintenance time depends on the type of cement. For example, for ordinary Portland cement concrete, it is not less than 7 days and nights. The latter is applicable to high-rise structures and large-area concrete structures that are not easy to sprinkle water for maintenance. It is to spray a perchloroethylene resin plastic solution on the concrete surface with a spray gun. After the solution volatilizes, a film is formed on the concrete surface, isolating the concrete from the air and preventing the evaporation of water inside the concrete to ensure the normal progress of the hydration of cement. After the maintenance is completed, the film can age and fall off by itself. Second, steam maintenance: The concrete components are placed in a maintenance room filled with saturated steam or a mixture of steam and air, and the concrete hardening is accelerated in a higher temperature and humidity environment. The maintenance effect is related to the steam maintenance system, which includes: the standing time before steam maintenance, the heating and cooling rates, the maintenance temperature, the constant temperature maintenance time, the relative humidity, etc. Steam maintenance rooms include pit type, vertical kiln type and tunnel kiln type. The above maintenance methods, especially steam maintenance, have high requirements for the manual operation environment and high manual maintenance costs. In order to solve the labor costs of manual spraying and repeated water addition construction and reduce the manual labor intensity, a processing method for non-woven fabrics for concrete moisture conservation and maintenance is designed. Summary of the Invention

[0003] The purpose of the present invention is to provide a processing method for non-woven fabrics for concrete moisture conservation and maintenance to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A processing method for non-woven fabrics for concrete moisture conservation and maintenance, comprising the following steps:

[0005] Step S1, prepare PP spunbond non-woven fabric with a preset specification and weight;

[0006] Step S2, mix 60-80 mesh SAP powder and 80 mesh EVA hot melt powder in a certain proportion;

[0007] Step S3: Sprinkle the mixed SAP and EVA powders onto the PP spunbond non-woven fabric using a vibrating powder spreader;

[0008] Step S4: Pass the powder-sprinkled non-woven fabric through an oven to melt the EVA powder when heated;

[0009] Step S5: At the outlet of the oven, press and laminate the non-woven fabric with a PP or PE film to form a composite structure, obtaining a semi-finished product of the concrete moisture-preserving and curing non-woven fabric;

[0010] Step S6: Wind up the semi-finished product of the concrete moisture-preserving and curing non-woven fabric, and cut it to a fixed length and package it according to requirements to obtain the finished concrete moisture-preserving and curing non-woven fabric.

[0011] Preferably, in step S1, the PP spunbond non-woven fabric uses a 22-25 gsm PP spunbond non-woven fabric.

[0012] Preferably, in step S2, the SAP powder and the EVA powder are mixed in a ratio of 4:6 or 3:7, and the usage amounts of the SAP powder and the EVA powder are 10-12 grams per square meter.

[0013] Preferably, in step S4, the heating temperatures of the oven are set to 110°C, 130°C, and 150°C in sequence, and the speed of the production line of the oven is controlled at about 20 meters per minute.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1) Through hot melt lamination, the present invention realizes the composite structure of the non-woven fabric and the PP or PE film. The intermediate layer contains superabsorbent SAP powder, which can store a certain amount of water, and the surface layer film structure prevents water evaporation;

[0016] 2) The concrete moisture-preserving and curing non-woven fabric of the present invention, as a flexible material, can adapt to different concrete building structures and achieve long-term moisture-preserving and curing on the surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of the method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arrangement", "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Please refer to Figure 1 , the present invention provides a technical solution: a processing method of a concrete moisture-preserving and curing non-woven fabric, including the following steps:

[0021] Step S1: Prepare a PP spunbond non-woven fabric with a preset specification and weight;

[0022] Step S2: Mix 60-80 mesh SAP powder and 80 mesh EVA hot melt powder in a certain proportion;

[0023] Step S3: Sprinkle the mixed SAP and EVA powders onto the PP spunbond non-woven fabric through a vibrating powder sprinkler;

[0024] Step S4: Pass the powder-sprinkled non-woven fabric through an oven to melt the EVA powder after heating;

[0025] Step S5: At the outlet of the oven, press and laminate the non-woven fabric with a PP or PE film to form a composite structure, obtaining a semi-finished product of the concrete moisture-preserving and curing non-woven fabric;

[0026] Step S6: Wind up the finished product of the concrete moisture-preserving and curing non-woven fabric, and cut it into a fixed length according to requirements for packaging to obtain the finished concrete moisture-preserving and curing non-woven fabric.

[0027] Further, in step S1, the PP spunbond non-woven fabric uses a 22-25 gsm PP spunbond non-woven fabric.

[0028] Further, in step S2, the SAP powder and the EVA powder are mixed in a ratio of 4:6 or 3:7, and the usage amounts of the SAP powder and the EVA powder are 10-12 grams per square meter.

[0029] Further, in step S4, the heating temperatures of the oven are set to 110°C, 130°C, and 150°C in sequence, and the speed of the production line of the oven is controlled at about 20 meters per minute.

[0030] Further, in step S5, the PP or PE film uses a 10 gram per square meter specification.

[0031] Specifically, the present invention is further elaborated in detail in combination with the embodiments:

[0032] 1. Select PP spunbond non-woven fabric with a weight of 22 g / m², unwind it through a powder sprinkler, and the single-sided powder sprinkling amount is 10 - 12 g / m²;

[0033] 2. Mix 80-mesh SAP powder and 80-mesh EVA hot melt powder in a ratio of 4:6;

[0034] 3. Sprinkle the mixed SAP and EVA powder on the PP spunbond non-woven fabric through a vibrating powder sprinkler;

[0035] 4. Pass the powder-sprinkled non-woven fabric through an oven, where the heating oven temperature is set at 110°C, 130°C, 150°C, 150°C, and the speed is 20 m / min to melt the EVA powder after heating;

[0036] 5. At the outlet of the oven, put the non-woven fabric and the PE film into a unwind machine, press and laminate them through a pressure roller, and wind them up to form a composite structure to obtain a semi-finished product of concrete moisture-preserving and curing non-woven fabric;

[0037] 6. Cut and package the semi-finished product of concrete moisture-preserving and curing non-woven fabric according to requirements to obtain the finished concrete moisture-preserving and curing non-woven fabric.

[0038] The concrete moisture-preserving and curing non-woven fabric of the present invention is used for surface moisture-preserving and curing of concrete, bridges, buildings, etc. It is mainly through powder-sprinkling lamination of PP spunbond non-woven fabric and PE film or PP film, and mixing a certain proportion of SAP superabsorbent powder in the composite layer. The water-proof property of PP or PE film is used to prevent water evaporation, and the SAP absorbent powder in the middle layer maintains the humidity of the inner layer in contact with the concrete surface under the action of sufficient water absorption to achieve the purpose of curing. The SAP absorbent powder can maintain water for a long time after absorbing water, and can maintain water for 10 - 14 days with a single water addition, ensuring the curing effect of the concrete surface.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A processing method of a non-woven fabric for concrete moisture conservation, characterized in that, It includes the following steps: Step S1: Prepare a PP spunbond non-woven fabric with a preset specification weight; Step S2: Mix SAP powder with 60 - 80 mesh and EVA hot melt powder with 80 mesh in a certain proportion; Step S3: Spread the mixed SAP and EVA powder on the PP spunbond non-woven fabric through a vibrating powder sprinkler; Step S4: Pass the powder-sprinkled non-woven fabric through an oven to melt the EVA powder after heating; Step S5: At the outlet of the oven, press and laminate the non-woven fabric with a PP or PE film to form a composite structure, obtaining a semi-finished product of the concrete moisture-preserving curing non-woven fabric; Step S6: Wind up the finished product of the concrete moisture-preserving curing non-woven fabric, and cut it into a fixed length according to requirements for packaging to obtain the finished concrete moisture-preserving curing non-woven fabric.

2. The processing method of a non-woven fabric for concrete moisture conservation according to claim 1, characterized in that: In step S1, the PP spunbond non-woven fabric uses a 22 - 25 gsm PP spunbond non-woven fabric.

3. The processing method of a non-woven fabric for concrete moisture conservation according to claim 1, characterized in that: In step S2, the SAP powder and EVA powder are mixed in a ratio of 4:6 or 3:7, and the usage amounts of the SAP powder and EVA powder are 10 - 12 grams per square meter.

4. The processing method of a non-woven fabric for concrete moisture conservation according to claim 1, characterized in that: In step S4, the heating temperatures of the oven are set to 110°C, 130°C, and 150°C in sequence, and the speed of the production line of the oven is controlled at about 20 meters per minute.

5. The processing method of a non-woven fabric for concrete moisture conservation according to claim 1, characterized in that: In step S5, the PP or PE film uses a specification of 10 grams per square meter.

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