Hydrotalcite-ammonium polyphosphate halogen-free flame retardant and preparation method thereof

A technology of ammonium polyphosphate and hydrotalcite, applied in the field of halogen-free flame retardants and its preparation, can solve the problem of low flame retardant efficiency of inorganic flame retardants aluminum hydroxide and magnesium hydroxide, affecting the mechanical properties and processing flow of flame retardant materials In order to achieve the effects of improved mechanical properties and processing fluidity, good practicability, and broad application prospects

Active Publication Date: 2012-01-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In this new type of material that contains calcium hydroxyapatite (CaHAP) crystals), there's no harmful chemical called bromine or chloride atoms at all except for some other elements like nitrogen gas which makes it difficult to fire effectively without causing any damage from burning out too much fuel during combustions. By adding these particles into rubber compounds instead of solid ones, they improve their performance over existing methods such as organophilics and molded resin products. These improvements make them more durable than current alternatives but still have potential applications in various industries where high levels of environmental safety standards require flames resistancy.

Problems solved by technology

Technologies aim towards improving the performance and safety of flames caused by various chemical substitutes including halogens, metal salts like calcium salt, iron powder, metals, aliquaternary amine containing fluoro groups, cyanates, melamite, pyromelene, tungsten trioxy radical hexaphosphonazo-1(2012), perovskites, silicon carbons, nanocompositions made from these agents, and others. However, this problem arises because conventional methods require multiple steps during synthesis process leading to increased cost and reduced yield compared to smaller amounts of each ingredient.

Method used

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  • Hydrotalcite-ammonium polyphosphate halogen-free flame retardant and preparation method thereof
  • Hydrotalcite-ammonium polyphosphate halogen-free flame retardant and preparation method thereof
  • Hydrotalcite-ammonium polyphosphate halogen-free flame retardant and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029](1) Place 3 g of commercially available hydrotalcite in 250 mL of 50% industrial alcohol, ultrasonicate at 50 Hz in an ultrasonic instrument (KQ-50B, Kunshan Ultrasonic Instrument Co., Ltd.) for 0.5 h, and then stir in a water bath at 60 ° C for 1 h to form a uniform suspension. turbid liquid;

[0030] (2) Weigh 3g of ammonium polyphosphate, add it into the hydrotalcite suspension in step (1) under continuous stirring, adjust the pH value of the solution to 4.0 with 1mol / L phosphoric acid, and keep stirring in a water bath at 60°C for 2h , filtered, the filter cake was first washed with 50% industrial alcohol, then washed with deionized water until neutral, dried at 70°C, and ground to obtain 3.313g of hydrotalcite-ammonium polyphosphate halogen-free flame retardant.

Embodiment 2

[0032] (1) Put 3 g of commercially available hydrotalcite (LDH) in 250 mL of 50% industrial alcohol, ultrasonically treat it in an ultrasonic instrument at 50 Hz for 0.5 h, and stir in a water bath at 60 ° C for 1 h to form a uniform suspension;

[0033] (2) Weigh 6g of ammonium polyphosphate (APP), and add it into the hydrotalcite suspension in step (1) under continuous stirring; adjust the pH value of the solution to 4 with 1mol / L phosphoric acid, and place it in a water bath at 60°C Continue to stir for 4 hours, filter, wash the filter cake with 50% industrial alcohol, then wash with deionized water until neutral, dry at 70°C, and grind to obtain 3.219g of hydrotalcite-ammonium polyphosphate halogen-free flame retardant (LDH-APP) , and carry out XRD spectrogram test to hydrotalcite-ammonium polyphosphate halogen-free flame retardant with X-ray diffractometer (X'Pert PRO, Holland PNAlytical company), the result is as follows figure 1 It can be seen that the interlayer spacin...

Embodiment 3

[0035] (1) Put 3 g of commercially available hydrotalcite in 250 mL of 50% industrial alcohol, sonicate for 0.5 h at 50 Hz in an ultrasonic instrument, and stir in a water bath at 70 ° C for 1 h to form a uniform suspension;

[0036] (2) Weigh 9g of ammonium polyphosphate, add it into the hydrotalcite suspension in step (1) under continuous stirring, adjust the pH value of the solution to 4.0 with 1mol / L phosphoric acid, and keep stirring in a water bath at 70°C for 6h , filtered, the filter cake was first washed with 50% industrial alcohol, then washed with deionized water to neutrality, dried at 70°C, ground to obtain 3.019g of hydrotalcite-ammonium polyphosphate halogen-free flame retardant, and used an infrared spectrometer (Nicolet 670, U.S. Nicoli Company) carried out infrared scanning on hydrotalcite-ammonium polyphosphate halogen-free flame retardant, the results are shown in figure 2 , compared with the infrared spectrum of raw material hydrotalcite (LDH), in the inf...

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Abstract

The invention discloses a hydrotalcite-ammonium polyphosphate halogen-free flame retardant and a preparation method thereof. Hydrotalcite, which serves as the raw material, is subjected to anion exchange with ammonium polyphosphate to obtain the hydrotalcite-ammonium polyphosphate halogen-free flame retardant. The preparation method comprises the following steps: (1) mixing hydrotalcite with industrial alcohol, carrying out 0-50Hz ultrasonic treatment for 0.5-1 hour, and carrying out water bath at 60-80 DEG C while stirring for 1-3 hours, thereby obtaining a uniform suspension; and (2) while continuously stirring, adding ammonium polyphosphate of which the polymerization degree is 1000-1200 into the suspension obtained in the step (1), regulating the pH value of the reaction liquid to 4.0-5.0, carrying out water bath at 60-80 DEG C while stirring for 2-6 hours, filtering, washing the filter cake, drying, and grinding to obtain the hydrotalcite-ammonium polyphosphate halogen-free flameretardant. The halogen-free flame retardant disclosed by the invention is halogen-free and flame-retardant, has the functions of filling, reinforcement and the like, has the advantages of simple preparation technique, wide material sources and high practicality, and is easy to operate.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV OF TECH
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