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Preparation method of flame-resistant paper

A flame-retardant paper, high flame-retardant technology, applied in the field of papermaking, can solve the problems that have not been reported in the literature

Inactive Publication Date: 2014-06-18
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the similarity of fiber composition between paper products and textiles, this flame retardant should also have a good flame retardant effect on paper and paper products, but there is no literature report yet

Method used

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  • Preparation method of flame-resistant paper
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  • Preparation method of flame-resistant paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The preparation of N-hexahydroxymethylaminocyclotriphosphazene comprises the steps:

[0014] Add 40.16g of the mixed product of hexaaminocyclotriphosphazene and ammonium chloride (containing 17.68g of hexaaminocyclotriphosphazene, i.e. 0.0764mol) into a 250mL three-necked flask with stirring and condenser, add 60g of water and stir to dissolve, Add a few drops of triethanolamine to adjust the pH ≈ 9, add 47.69 g (0.5042 mol) of a formaldehyde solution with a mass fraction of 31.72% at room temperature, and drop it in about 40 minutes, then raise the temperature to 70°C for 3 hours to obtain a product solution of 185.15 g, the mass fraction of N-hexahydroxymethylaminocyclotriphosphazene is 16.99%, the free formaldehyde content is 0.033%, the formaldehyde conversion rate is 99.69%, and the reaction is very complete.

Embodiment 2

[0016] spraying method

[0017]The sample cardboard is made by multi-layer composite pressing of base paper on a pressure gauge (provided by Qingdao Tianfeng Paper Co., Ltd.). The limiting oxygen index (LOI) is tested according to GB / T2046-80, and the vertical combustion is tested according to the TAPPI T461OS-79 method. The size of the limiting oxygen index test sample is 100×6.5×1.3mm, and the instrument used is the JF-3 oxygen index tester produced by Nanjing Jiangning District Analytical Instrument Factory; the size of the vertical combustion test sample is 210×70×1.3mm, The instrument used is the CZF-3 horizontal and vertical combustion tester produced by Nanjing Jiangning District Analytical Instrument Factory. The spraying method is to use a sprayer to evenly spray a certain amount of flame retardant solution on the paper, so that the content of flame retardant in the flame retardant paper reaches the required amount, and then dry the above treated paper in the natural...

Embodiment 3

[0022] Dipping method

[0023] The impregnation method means that when preparing flame retardant paper with a flame retardant content of 3%, it can be made into a solution with a flame retardant concentration of 3%, and the paper is immersed in the solution for about 5 minutes to make the paper absorb water to saturation (the absorption amount is about equal to own paper quality), followed by drying according to the method described in Example 2. Similarly, flame retardant paper with content of 1.5% and 4.5% can be prepared. After testing, the results are similar to those in Table 1, that is, when the addition of flame retardant is 3%, the LOI of the sample is 32.2%, which is a flame-retardant grade, and the average carbonization length of vertical combustion is 12mm, which is far less than 115mm, which is qualified.

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Abstract

The invention belongs to a preparation method of a flame-resistant paper with the high flame retardancy. The method is used for preparing N-hexamethylolaminocyclotriphosphazene flame-resistant paper. Specifically, the method comprises the steps of evenly spraying an aqueous solution of N-hexamethylolaminocyclotriphosphazene onto paper by adopting a spraying method or soaking the paper in the aqueous solution of N-hexamethylolaminocyclotriphosphazene for 5 minutes by adopting a soaking method, next, air-dying in a natural environment for 1-2 hours, and then baking in a papermaking dryer at the temperature ranging from 100 to 160 DEG C for 10-60 minutes to obtain the flame-resistant paper. The addition amount of the N-hexamethylolaminocyclotriphosphazene accounts for 3%-6% of the weight of the flame-resistant paper, preferably 3%. When the addition amount of a flame retardant is 3%, the LOI of a test sample is about 32%, and is at the fire-retardant level, and the average carbonization length of vertical combustion is 12 millimeters, and is far smaller than 115 millimeters required by TAPPI T461OS-79. In addition, the flame-resistant paper prepared by adopting the method has the advantages of small carbonization area on fire, no residual flame and no smoldering, and further is convenient to use, and moreover, the strength of the flame-resistant paper is still ideal.

Description

technical field [0001] The invention relates to a method for preparing flame-retardant paper, specifically using N-hexahydroxymethylaminocyclotriphosphazene flame-retardant paper, which belongs to the field of papermaking. Background technique [0002] As we all know, paper and paper products are generally made of plant fibers. The flammability of plant fibers determines the flammability of paper products, so the use of paper often causes fires. As people pay more and more attention to fire safety, the requirements for flame retardancy of certain paper and cardboard varieties are also increasing day by day. Therefore, the preparation of flame-retardant paper is also increasingly important [Li Chao, Hui Lanfeng, Liu Zhong. Research and development status and trends of flame-retardant paper [J]. Zhonghua Paper Industry, 2010,23:62-66.]. [0003] Flame-retardant paper belongs to the category of special paper, which refers to paper that has the ability to inhibit the spread of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00D21H17/10
Inventor 何为刘雨佳王勇唐林生
Owner QINGDAO UNIV OF SCI & TECH
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