Effect Of New Calcium Silicate Filler On The Performance Of Coated Flame Retardant Paper
Effect of new calcium silicate filler on the performance of coated flame retardant paper
The new calcium silicate filler (hereinafter referred to as calcium silicate filler) is the first high-alumina fly ash for the pre-desilicon silicon source solution, and then deep processing of a new type of silicate material. Its main components are SiO2 45% ~ 47%, CaO 42% ~ 45%, MgO about 2%. The new calcium silicate filler has an average particle size of 15 to 30 m, a true density of 1.3 to 1.4 g / cm3, and a specific surface area of 50 to 150 m2 / g. Because of its small average particle size, density, specific surface area, can be used as an excellent paper filler.
Calcium silicate filler has a high heat resistance, the thermal conductivity than other hard block insulation material low. This new type of calcium silicate filler added to the fire-retardant paper, the use of new calcium silicate filler adsorption and heat resistance, to enhance the paper's flame retardant effect. And calcium silicate filler has the characteristics of cheap and environmentally friendly, so the calcium silicate filler for the preparation of flame retardant paper has a certain practical value.
Antimony trioxide reacts with the gaseous bromide produced by decabromodiphenyl ethane combustion. The antimony bromide is a noncombustible gas that covers the surface of the sample and is free of air. More importantly, the reaction of hydrogen bromide with free radical-OH, on the one hand to bromide ions to be regenerated, on the one hand to reduce the concentration of -OH combustion chain reaction is inhibited until the stop burning.
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The waste paper pulp and the old corrugated box pulp were mixed at a mass ratio of 6: 4, and a calcium silicate filler was added to prepare a 1% syrupy suspension. Add 0.5% enhancer cationic tapioca starch (CS), 0.05% retention agent cationic polyacrylamide (Percol 47).
In the experiment, the pigment was dispersed at 2000 rpm for 30 min, and 0.5% dispersant (sodium polyacrylate) was added. Add dispersed antimony trioxide, decabromodiphenyl ethane, calcium silicate filler, which added 20% adhesive (SBR latex), dubbed the coating. Choose a different coating rod for manual coating. After the coating, the mixture was dried in an oven at 65 ° C for 5 minutes, and then pressed at 60 ° C twice at a pressure of 3 MPa.
Effect of Calcium Silicate on the Performance of Flame Retardant Paper
When the amount of calcium silicate added in the base paper is 20%, the tightness, ring pressure index and burst index of the flame retardant paper all reach the maximum value. As the calcium silicate has a high thermal stability, can delay the paper temperature rise, flame retardant properties with the increase in calcium silicate filler increased first and then reduced.
Effect of Two Kinds of Flame Retardants in Coatings on the Performance of Coated
As the mass ratio of antimony trioxide and decabromodiphenyl ethane in the coating increases, the carbonization length and burning time of the flame retardant paper are increased first and then increased. When the mass ratio of antimony trioxide to decabromodiphenyl ethane is 2: 1, the burning time and carbonization length of flame retardant paper achieve the best effect of flame retardant.
Effect of Calcium Silicate Filler Content in Coatings on Coated
The ring index and the burst index of the physical properties of the flame retardant paper show a decreasing trend with the increase of the amount of calcium silicate in the coating. The addition of calcium silicate filler to the coating has little effect on the flame retardancy of the flame retardant paper. The increase in the amount of coating reduces the physical strength of the flame retardant paper. With the increase of the coating amount, the flame retardancy of the paper is gradually increased, and the burning time and the carbonization length are all decreasing.
In the coating experimental conditions remain unchanged, the original paper when the increase in the amount of starch, the physical properties of the paper as a whole steadily increased. Taking into account the starch to increase the cost of paper and the national standard on the requirements of the fire-retardant paper, so in the base paper calcium carbonate filler 10%, cationic starch dosage of 1% to achieve the most reasonable point of fire-resistant paper breaking index.