Non-combustible paper and preparation method thereof

Abstract

The invention discloses non-combustible paper and a preparation method thereof, and relates to the technical field of non-combustible paper. The novel newsprint paper comprises base paper, a crystal film is embedded in the base paper, the base paper is coated with a curing layer, the curing layer is coated with a hydrophobic coating, and the base paper is newsprint paper. According to the invention, the crystallization film, the curing layer and the hydrophobic coating are formed on the newsprint, the crystallization film absorbs and disperses heat and enhances the flame retardant property of the non-combustible paper, and the curing layer reduces the heat release rate and mass loss of the non-combustible paper and improves the mechanical strength and stability of the non-combustible paper at the same time; the hydrophobic coating enables the non-combustible paper to have the characteristics of water resistance, fog resistance, oxidation resistance, corrosion resistance and the like, so that the non-combustible paper can keep good performance in different environments, the service life of the non-combustible paper is prolonged, the stability of the non-combustible paper is further improved, meanwhile, the non-combustible paper is prevented from being ignited by flames in a fire disaster, and the service life of the non-combustible paper is prolonged. The crystallization film, the curing layer and the hydrophobic coating are made of inorganic materials, so that the prepared non-combustible paper is non-toxic, odorless, green and environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of non-combustible paper, in particular to non-combustible paper and a preparation method thereof. Background Art

[0002] Non-combustible paper has flame retardant properties. It will carbonize when exposed to fire, but will not burn. It is made of asbestos or paper treated with appropriate flame retardants. Commonly used organic flame retardants include aromatic high-brominated compounds (tetrabromobisphenol A, TBPA), halogen-containing aliphatic phosphates (tetrakishydroxymethylphosphonium chloride, THPC), chlorinated paraffin, phosphorus-containing resins, etc. It is suitable for use in construction, insulation, telecommunications and other occasions. However, there are still some problems with the non-combustible paper in the prior art: 1. The flame retardant components of the non-combustible paper prepared by the prior art have poor performance in terms of heat dispersion and heat release rate, resulting in poor flame retardancy of the non-combustible paper, and poor strength and stability of the non-combustible paper. At the same time, since most non-combustible papers lack a protective layer on the outer layer, the non-combustible paper does not have waterproof and anti-corrosion properties, which makes the non-combustible paper unsuitable for use in special environments; 2. At the same time, the components of the non-combustible paper prepared by the prior art are mostly made of organic materials, and the effective non-combustible temperature range of the non-combustible paper is usually below 300°C, which makes the non-combustible paper easily ignited by flames in a real fire; In view of the above problems, the inventors proposed a non-combustible paper and a preparation method thereof to solve the above problems. Summary of the invention

[0003] In order to solve the problems of poor flame retardancy, low overall strength and poor environmental performance of non-combustible paper, the object of the present invention is to provide a non-combustible paper and a preparation method thereof.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a non-combustible paper, comprising a base paper, a crystal film is embedded in the base paper, a solidified layer is coated on the base paper, and a hydrophobic coating is coated on the solidified layer.

[0005] The base paper is newsprint.

[0006] The present invention also provides a method for preparing non-combustible paper, comprising the following steps: S1. Soaking of base paper Firstly, the base paper is placed in a container, and then a boron salt solution is added to soak the base paper, so that the base paper is completely soaked in the boron salt solution and the boron salt solution completely penetrates the base paper; S2. Making a crystal film The soaked base paper is taken out, and the base paper is placed in a drying device to dry the base paper. The gaps in the plant fibers of the base paper are completely filled with the boron salt solution, and a crystal film is formed after the water is evaporated by drying. S3. Making the solidified layer Adding an inorganic raw material into a reaction kettle, polymerizing the inorganic raw material, and then evenly coating a solution generated by the polymerization reaction on the crystal film to form a solidified layer on the crystal film; S4. Making a hydrophobic coating The waterproofing agent mixed solution is evenly coated on the solidified layer to form a hydrophobic coating on the solidified layer, thereby obtaining non-combustible paper.

[0007] In S1, the soaking time of the base paper is ≥30s.

[0008] In S2, the base paper is dried at a temperature of 50-70°C and for a time of 5-8 minutes.

[0009] In S3, the inorganic raw materials include aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic high polymerizing agent.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by forming a crystal film, a solidified layer and a hydrophobic coating on newsprint, the crystal film absorbs and disperses heat, thereby enhancing the flame retardant properties of the non-combustible paper; the solidified layer reduces the heat release rate and mass loss of the non-combustible paper, while improving the mechanical strength and stability of the non-combustible paper; the hydrophobic coating enables the non-combustible paper to have waterproof, anti-fog, anti-oxidation and anti-corrosion properties, thereby enabling the non-combustible paper to maintain good performance in different environments, thereby improving the service life of the non-combustible paper, further improving the stability of the non-combustible paper, and preventing the non-combustible paper from being ignited by flames in a fire; 2. In the present invention, inorganic materials are used to make the crystal film, the solidified layer and the hydrophobic coating, so that the prepared non-combustible paper is non-toxic, odorless and green. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 The figure is a schematic diagram of the composition of a non-combustible paper of the present invention.

[0013] Figure 2 The present invention is a schematic flow chart of a method for preparing non-combustible paper.

[0014] In the figure: 1. Base paper; 2. Crystallized film; 3. Cured layer; 4. Hydrophobic coating. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Embodiment 1: Figure 1-2 As shown, the present invention provides a non-combustible paper, comprising a base paper 1, a crystal film 2 is embedded in the base paper 1, a solidified layer 3 is coated on the base paper 1, a hydrophobic coating 4 is coated on the solidified layer 3, and the base paper 1 is newsprint.

[0017] The present invention also provides a method for preparing non-combustible paper, comprising the following steps: S1. Newsprint soaking Firstly, newsprint is placed in a container, and then a boron salt solution is added to soak the newsprint, so that the newsprint is completely soaked in the boron salt solution, and the boron salt solution completely penetrates the base paper 1, and the soaking time of the newsprint is 30 seconds; S2. Making crystal film 2 Take out the soaked newsprint, put the newsprint into a drying device, and dry the newsprint. The drying temperature of the newsprint is 50° C. and the drying time is 5.5 minutes. The gaps in the plant fibers of the newsprint are completely filled with the boron salt solution. After drying and evaporating the water, a crystal film 2 is formed. S3, making solidified layer 3 Aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are added into a reaction kettle, and the aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are polymerized, and then a solution generated by the polymerization reaction is evenly coated on the crystal film 2 to form a solidified layer 3 on the crystal film 2; S4. Preparation of hydrophobic coating 4 The waterproofing agent mixed solution is evenly coated on the solidified layer 3 to form a hydrophobic coating layer 4 on the solidified layer 3, thereby obtaining non-combustible paper.

[0018] Embodiment 2, the present invention also provides a method for preparing non-combustible paper, comprising the following steps: S1. Newsprint soaking Firstly, newsprint is placed in a container, and then a boron salt solution is added to soak the newsprint, so that the newsprint is completely soaked in the boron salt solution, and the boron salt solution completely penetrates the base paper 1, and the soaking time of the newsprint is 50 seconds; S2. Making crystal film 2 Take out the soaked newsprint, put the newsprint into a drying device, and dry the newsprint. The drying temperature of the newsprint is 60° C. and the drying time is 5 minutes. The gaps in the plant fibers of the newsprint are completely filled with the boron salt solution. After drying and evaporating the water, a crystal film 2 is formed. S3, making solidified layer 3 Aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are added into a reaction kettle, and the aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are polymerized, and then a solution generated by the polymerization reaction is evenly coated on the crystal film 2 to form a solidified layer 3 on the crystal film 2; S4. Preparation of hydrophobic coating 4 The waterproofing agent mixed solution is evenly coated on the solidified layer 3 to form a hydrophobic coating layer 4 on the solidified layer 3, thereby obtaining non-combustible paper.

[0019] Embodiment 3, the present invention also provides a method for preparing non-combustible paper, comprising the following steps: S1. Newsprint soaking First, newsprint is placed in a container, and then a boron salt solution is added to soak the newsprint, so that the newsprint is completely soaked in the boron salt solution, and the boron salt solution completely penetrates the base paper 1, and the soaking time of the newsprint is 90 seconds; S2. Making crystal film 2 Take out the soaked newsprint, put the newsprint into a drying device, and dry the newsprint. The drying temperature of the newsprint is 65° C. and the drying time is 7 minutes. The gaps in the plant fibers of the newsprint are completely filled with the boron salt solution. After drying and evaporating the water, a crystal film 2 is formed. S3, making solidified layer 3 Aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are added into a reaction kettle, and the aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are polymerized, and then a solution generated by the polymerization reaction is evenly coated on the crystal film 2 to form a solidified layer 3 on the crystal film 2; S4. Preparation of hydrophobic coating 4 The waterproofing agent mixed solution is evenly coated on the solidified layer 3 to form a hydrophobic coating layer 4 on the solidified layer 3, thereby obtaining non-combustible paper.

[0020] Embodiment 4, the present invention also provides a method for preparing non-combustible paper, comprising the following steps: S1. Newsprint soaking Firstly, newsprint is placed in a container, and then a boron salt solution is added to soak the newsprint, so that the newsprint is completely soaked in the boron salt solution, and the boron salt solution completely penetrates the base paper 1, and the soaking time of the newsprint is 120 seconds; S2. Making crystal film 2 Take out the soaked newsprint, put the newsprint into a drying device, and dry the newsprint. The drying temperature of the newsprint is 70° C. and the drying time is 8 minutes. The gaps in the plant fibers of the newsprint are completely filled with the boron salt solution. After drying and evaporating the water, a crystal film 2 is formed. S3, making solidified layer 3 Aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are added into a reaction kettle, and the aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic polymerizing agent are polymerized, and then a solution generated by the polymerization reaction is evenly coated on the crystal film 2 to form a solidified layer 3 on the crystal film 2; S4. Preparation of hydrophobic coating 4 The waterproofing agent mixed solution is evenly coated on the solidified layer 3 to form a hydrophobic coating layer 4 on the solidified layer 3, thereby obtaining non-combustible paper.

[0021] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A non-combustible paper, comprising a base paper (1), characterized in that: A crystal film (2) is embedded in the base paper (1), a solidified layer (3) is coated on the base paper (1), and a hydrophobic coating (4) is coated on the solidified layer (3).

2. The non-combustible paper according to claim 1, characterized in that: The base paper (1) is newsprint.

3. A method for preparing the non-combustible paper according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1, base paper (1) soak Firstly, the base paper (1) is placed in a container, and then a boron salt solution is added to soak the base paper (1), so that the base paper (1) is completely immersed in the boron salt solution, and the boron salt solution completely penetrates the base paper (1); S2. Preparation of crystalline film (2) Taking out the soaked base paper (1), placing the base paper (1) into a drying device, and drying the base paper (1), so that the gaps in the plant fibers of the base paper (1) are completely filled with the boron salt solution, and the water is evaporated by drying to form a crystal film (2); S3. Making a solidified layer (3) Adding an inorganic raw material into a reaction kettle, subjecting the inorganic raw material to a polymerization reaction, and then uniformly coating a solution generated by the polymerization reaction on the crystal film (2), thereby forming a solidified layer (3) on the crystal film (2); S4. Preparation of hydrophobic coating (4) The waterproofing agent mixed solution is evenly coated on the solidified layer (3) to form a hydrophobic coating (4) on the solidified layer (3), thereby obtaining non-combustible paper.

4. A method for preparing non-combustible paper according to claim 3, characterized in that: In S1, the soaking time of the base paper (1) is ≥30 seconds.

5. The method for preparing non-combustible paper according to claim 3, characterized in that: In S2, the base paper (1) is dried at a temperature of 50 to 70°C and for a drying time of 5 to 8 minutes.

6. The method for preparing non-combustible paper according to claim 3, characterized in that: In S3, the inorganic raw materials include aluminum phosphate, magnesium silicate, sodium silicate, a fire retardant and an inorganic high polymerizing agent.

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