CN-122011515-A - Kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide and preparation method and application thereof

Abstract

The invention discloses a kaolin loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide, and a preparation method and application thereof. The preparation method of the flame retardant synergist comprises the following steps of generating a precursor from zinc salt, ferric salt and kaolin by an in-situ coprecipitation method, and calcining the precursor at high temperature to obtain the flame retardant synergist which is formed by in-situ growth of zinc ferrite in a nano particle form and is loaded on the surface and interlayer of the kaolin. The flame retardant synergist has excellent flame retardant and smoke abatement performance, and can effectively replace antimony trioxide. Compared with the traditional antimony trioxide, the flame retardant synergist has better flame retardant effect, and the cost is reduced by about 85 percent. In practical application, the flame retardant synergist can equally replace antimonous oxide, the replacement ratio is 50% -100%, and the flame retardant synergist is widely applicable to polymer materials such as ABS, PP, PVC, PA and has good replacement and environmental protection performances.

Inventors

• ZHANG SHENG
• Guo Gehao
• GU XIAOYU
• SUN JUN

Assignees

• 北京化工大学

Dates

Publication Date

20260512

Application Date

20260318

Claims (9)

1. 1. The kaolin loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide is characterized by comprising a lamellar kaolin carrier and zinc ferrite loaded on the surface and between layers of the kaolin, wherein the zinc ferrite is loaded on the kaolin in a nano particle form in an in-situ growth mode, so that a lamellar-particle composite structure is formed.
2. 2. The preparation method of the kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide is characterized by comprising the following steps of: Step 1, dissolving ferric salt and zinc salt in deionized water and uniformly stirring; Step 2, adding kaolin into deionized water, and dispersing for a certain time under the ultrasonic condition to obtain uniform suspension; Step 3, placing the solution obtained in the step 1 into a three-neck flask and adjusting the PH value of the solution; Step 4, adding the suspension in the step 2 into the three-neck flask in the step 3, and heating and reacting for a period of time to obtain a precipitate; step 5, drying the precipitate obtained in the step 4 for a period of time at a certain temperature to obtain a precursor; And 6, calcining the precursor obtained in the step 5 in a muffle furnace at a certain temperature for a certain time to obtain the flame-retardant synergist.
3. 3. The method for preparing the kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide according to claim 2, wherein in the step 1, the ferric salt is one of ferric nitrate, ferric sulfate and ferric chloride, the zinc salt is one of zinc nitrate, zinc sulfate and zinc chloride, and the molar ratio of the zinc salt to the ferric salt is 1:2.1-2.6.
4. 4. The method for preparing the kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide according to claim 2, wherein in the step 2, the mesh number of the kaolin is 600-1000, the ultrasonic time is 20-60 min, and the carrier proportion of the kaolin is 40-80%.
5. 5. The method for preparing the kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimony trioxide according to claim 2, wherein in the step 3, the pH value of the solution is 9-12.
6. 6. The method for preparing the kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide according to claim 2, wherein in the step 4, the reaction temperature of the solution is 70-100 ℃ and the reaction time is 2-6 h.
7. 7. The method for preparing the kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimony trioxide according to claim 2, wherein in the step 5, the temperature of the oven is 80-120 ℃, and the drying time is 12-20 hours.
8. 8. The method for preparing the kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide according to claim 2, wherein in the step 6, the muffle furnace temperature is set to 400-800 ℃, and the calcination time is 4-8 hours.
9. 9. The application of the kaolin-loaded zinc ferrite flame-retardant synergist capable of replacing antimony trioxide is characterized in that the flame-retardant synergist is applied to ABS, PP, PVC, PA and other polymer materials, and 1-6 parts by weight of the flame-retardant synergist is used for partially or completely replacing antimony trioxide.

Description

Kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide and preparation method and application thereof Technical Field The invention relates to the technical field of plastic additives, in particular to a kaolin loaded zinc ferrite flame retardant synergist capable of replacing antimonous oxide, and a preparation method and application thereof. Background Antimony trioxide (Sb 2O3), commonly known as antimony white, is a white powdery inorganic compound with a melting point of 654 ℃. Antimony trioxide plays an irreplaceable important role in a number of industrial fields by virtue of its unique properties and wide range of uses. However, the most well known application is its use as a high efficiency flame retardant synergist, especially in flame retardant applications for plastics and related articles, where antimony trioxide is consumed in more than 70% of its total amount. When used alone, antimony trioxide has little flame retardant properties, but when used as a synergist for halogen-based flame retardants, particularly when compounded with brominated flame retardants, it can significantly improve the flame retardant effect. In recent years, the mining difficulty of antimony ore is increased, the supply of antimony raw materials is tense, the price of antimony is continuously increased, so that the price of antimony trioxide is increased dramatically, the cost of flame-retardant products is increased greatly, and the cost problem is brought to corresponding flame-retardant modification enterprises. Therefore, researchers have been looking for new flame retardant synergists that replace antimony trioxide. In recent years, partial substitutes such as zinc stannate, zinc hydroxystannate, zinc borate, molybdenum compounds and the like have been developed, and although good flame retarding effects can be exerted in plastic products, these substitutes are still relatively expensive, and under a certain amount of increasing conditions, at most about 30% of antimony trioxide can be replaced, which may lead to a decrease in comprehensive mechanical properties. Therefore, it is necessary to find a flame retardant synergist which is low in cost, large in substitution amount and simple in process. Disclosure of Invention In order to overcome the defects and the shortcomings in the prior art, the invention aims to provide the flame-retardant synergist which can completely replace the antimonous oxide, the flame-retardant effect is better than that of the antimonous oxide, and the price is lower than that of the antimonous oxide by 85%. The invention aims to provide a method for preparing the flame-retardant synergist for replacing antimony trioxide, which has the advantages of simple process, convenient operation, stable control, reliable product quality, high production efficiency, lower cost and potential of industrial production. The invention also aims to provide an environment-friendly flame-retardant synergist which can replace antimony trioxide, has good flame-retardant effect in ABS, PP, PVC, PA and other polymer materials, and has better environment-friendly performance than antimony trioxide. In order to achieve the above object, the present invention provides a kaolin-loaded zinc ferrite flame retardant synergist capable of replacing antimony trioxide, the flame retardant synergist comprises a lamellar kaolin carrier and zinc ferrite loaded on the surface and between layers of the kaolin, wherein the zinc ferrite is loaded on the kaolin in a nano particle form through an in-situ growth mode, so as to form a lamellar-particle composite structure. The invention also provides a preparation method of the kaolin-loaded zinc ferrite flame-retardant synergist capable of replacing antimonous oxide, which comprises the following reaction steps: Step1, dissolving ferric salt and zinc salt in deionized water and uniformly stirring; step 2, adding kaolin into deionized water, and dispersing for a certain time under the ultrasonic condition to obtain uniform suspension; step 3, placing the solution obtained in the step 1 into a three-neck flask and adjusting the PH value of the solution; Step 4, adding the suspension in the step 2 into the three-neck flask in the step 3, and heating and reacting for a period of time to obtain a precipitate; Step 5, drying the precipitate obtained in the step 4 at a certain temperature to obtain a precursor; And 6, calcining the precursor obtained in the step 5 in a muffle furnace at a certain temperature to obtain the flame-retardant synergist. The ferric salt in the step 1 is one of ferric nitrate, ferric sulfate and ferric chloride, and the preferable ferric salt is ferric chloride. The zinc salt in the step 1 is one of zinc nitrate, zinc sulfate and zinc chloride, and the preferred zinc salt is zinc chloride. The molar ratio of the zinc salt to the iron salt in the step 1 is 1:2.1-2.8, and the preferable molar ratio is 1:2.1-2.4. The kaolin in st