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Preparation method for high-temperature-resistant heat-insulating paper

A technology of high temperature resistant and heat insulating paper, applied in the field of papermaking, can solve the problems of difficulty in meeting the requirements of high heat insulating performance, not being industrialized application, poor heat insulating performance of heat insulating cardboard, etc., and achieving the effects of dimensional stability, loose structure and good environmental protection.

Inactive Publication Date: 2013-07-03
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature-resistant cardboard prepared by the above method has better heat resistance and bending resistance, but this method uses a variety of organic and inorganic fiber materials with different properties in the preparation process, such as aramid fibers are expensive, glass fibers are hydrophobic Strong, poor dispersion performance, hard ceramic fiber, high brittleness, etc.; and a variety of materials are added, the process is relatively complicated, and the product stability is poor
Chinese patent CN200610172087.6 discloses a preparation method of "thermal insulation cardboard", which mainly uses cross-linked fibers and processed cellulose fibers, such as citric acid cross-linked fibers, polyacrylic acid cross-linked fibers, polymaleic acid Cross-linked fibers, CTMP fibers, TMP fibers, etc. are used to prepare heat-insulating paperboards. The heat-insulating paperboards prepared by them have poor heat-insulating properties and can only be used for low-grade paper cup containers, which are difficult to meet the requirements of industrial and construction papers that require high heat-insulating properties.
Compared with other inorganic fiber materials, calcium sulfate whiskers have many excellent physical and chemical properties such as low wear, high temperature resistance, acid and alkali resistance, good insulation, and stable size. In addition to being used as a small amount of additives in the plastics and rubber industries, it has not been industrialized in other industries

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The calcium sulfate whiskers extracted from desulfurized gypsum with a purity of ≥99%, a whiteness of ≥88%ISO, and a length between 5-150μm and unbleached masson pine CTMP pulp of 25°SR after light beating were mixed at a ratio of 50:50. Fully mix the ratio; adjust the papermaking concentration to 1.5%, the pH value to 7.0-7.5, the papermaking mesh to 150 mesh, and make 85g / m on a square paper sheet machine 2 Wet paper sample; place the wet paper sample at 180-220°C for 30 minutes, then take it off; then impregnate the paper sample with high-temperature-resistant phenolic resin glue, and the amount of glue applied is controlled at 15g / m 2 ;After drying treatment, the quantity can be obtained: 100g / m 2 ; Bulk thickness: 1.1-1.2cm 3 / g; tensile strength ≥ 2.5MPa; temperature resistance: ≤ 350 ℃; loss on ignition 575 ℃ 1 hour less than 10% high temperature heat-resistant insulation paper; can be used as heat-resistant heat insulation of industrial electrical components h...

Embodiment 2

[0022] The calcium sulfate whiskers extracted from phosphogypsum with a purity of ≥99%, a whiteness of ≥88%ISO, and a length between 10-100μm and unbleached masson pine CTMP pulp of 30°SR after light beating were mixed at a ratio of 60:40 Fully mix the ratio; adjust the papermaking concentration to 1.5%, the pH value to 7.0-7.5, the papermaking mesh to 150 mesh, and make 130g / m on a square paper sheet machine 2 Wet paper sample; place the wet paper sample at 180-220°C for 30 minutes, then take it off; then impregnate the paper sample with high-temperature-resistant phenolic resin glue, and the amount of glue applied is controlled at 20g / m 2 ;After drying treatment, you can get quantitative: 150g / m 2 ; Bulk thickness: 1.0-1.1cm 3 / g; tensile strength ≥ 2.5MPa; temperature resistance: ≤ 350 ℃; loss on ignition 575 ℃ 1 hour less than 10% high temperature heat-resistant insulation paper; can be used as heat-resistant heat insulation of industrial electrical components heating pa...

Embodiment 3

[0024] The calcium sulfate whiskers extracted from nickel ore smelting waste slag with a purity of ≥99%, a whiteness of ≥88%ISO, and a length between 5-120 μm and the masson pine bleached CTMP pulp of 35°SR after light beating were mixed by 80: The ratio of 20 is fully mixed; adjust the papermaking concentration to 2.0%, the pH value is 7.0-7.5, the papermaking mesh is 200 mesh, and the papermaking 170g / m is made on a square paper sheet machine 2 Wet paper sample; place the wet paper sample at 180-220°C for 30 minutes, then take it off; then impregnate the paper sample with high-temperature-resistant phenolic resin glue, and the amount of glue applied is controlled at 30g / m 2 ; After drying, you can get quantitative: 200g / m 2 ; Bulk thickness: 0.9-1.0m 3 / g; tensile strength ≥ 2.5MPa; temperature resistance: ≤ 350 ° C; loss on ignition 575 ° C 1 hour less than 10% high temperature heat-resistant insulation paper; can be used for heat-resistant heat insulation of industrial e...

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Abstract

The invention discloses a preparation method for high-temperature-resistant heat-insulating paper. The preparation method is used for preparing high-temperature-resistant heat-insulating paper by performing steps such as pulping, burdening, sheet making, drying, and gumming on calcium sulfate crystal whisker mineral fiber, needlebush CTMP (Chemi-Thermo-Mechanical pulp) and high-temperature-resistant phenolic resin serving as main materials, and the high-temperature-resistant heat-insulating paper can be applied in the fields of temperature resistance and heat insulation for heating positions of industrial electrical appliance elements, interlayer heat preservation of steam pipelines, heat preservation and heat insulation for building wall bodies and the like. The heat insulating paper prepared with the method has the characteristics of high heat resistance, high heat insulating property, high bending resistance, high vibration capability, large loose depth, flexibility, low cost and the like; and moreover, the mineral fiber adopted in the high-temperature-resistant heat-insulating paper is a calcium sulfate crystal whisker raw material extracted from industrial gypsum waste residues, so that the pollution of industrial gypsum waste residues in China can be relieved effectively, the application field of calcium sulfate crystal whiskers is widened simultaneously, and the additional value of the crystal whiskers is raised.

Description

technical field [0001] The invention relates to a method for preparing high-temperature-resistant heat-insulating paper, which belongs to the technical field of papermaking. Background technique [0002] High temperature resistant insulation paper is a kind of special paper widely used in industry and construction industry. It is mainly used for heat insulation of heating parts of electrical components, interlayer insulation of high temperature equipment and steam pipes, insulation layer of building walls, etc. Asbestos has good heat-resistant and heat-insulating properties, is cheap, and has a loose structure. It was once widely used in the production of high-temperature-resistant heat-insulating paper (also known as "asbestos paper"). However, because asbestos has serious pollution to the environment and can cause cancer, the use of asbestos is currently strictly restricted by countries all over the world. The development of asbestos-free high temperature resistant therma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/36
Inventor 刘艳新王玉珑
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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