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Lanthanum stannate and application of composition of lanthanum stannate and inorganic flame retardant in halogen-containing superpolymer

An inorganic flame retardant, lanthanum stannate technology, applied in the application field of inorganic flame retardants, to achieve the effect of broadening the application range, improving the elongation at break, and adding less

Inactive Publication Date: 2015-07-22
HEBEI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Lanthanum stannate with pyrochlore structure and other rare earth stannates have high thermal stability, and their melting point is higher than 2000°C, which is higher than the processing temperature of most polymers, so they are suitable as additives for polymers, but There is no report on its use as a flame retardant

Method used

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  • Lanthanum stannate and application of composition of lanthanum stannate and inorganic flame retardant in halogen-containing superpolymer
  • Lanthanum stannate and application of composition of lanthanum stannate and inorganic flame retardant in halogen-containing superpolymer
  • Lanthanum stannate and application of composition of lanthanum stannate and inorganic flame retardant in halogen-containing superpolymer

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Experimental program
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preparation example Construction

[0018] The preparation of lanthanum stannate among the present invention adopts precipitation-calcination method, and concrete steps are as follows:

[0019] Equimolar concentrations of lanthanum nitrate La(NO 3 ) 3 The solution was added dropwise to the rapidly mechanically stirred sodium stannate solution (the volume ratio of the lanthanum nitrate solution to the sodium stannate solution was 2:3), after the dropwise addition was completed, the reaction was mechanically stirred at room temperature for 4 hours, then filtered and washed to obtain Precipitate of precursor; after drying the precursor at 120°C, calcining at 850°C for 8h, the pyrochlore-type lanthanum stannate (La 2 sn 2 o 7 ).

[0020] The XRD collection of collections of the lanthanum stannate prepared by the above-mentioned method can be found in figure 1 . figure 1 Medium gray vertical lines are standard cards (ICSD PDF #88-0446, La 2 sn 2 o 7 ), the black line spectrum represents the XRD spectrum ...

Embodiment 1~4

[0027] The flame retardant effect of lanthanum stannate as a flame retardant in soft PVC (DOP40).

[0028] Basic formula: PVC resin 100g, DOP (dioctyl phthalate) 40g, organotin stabilizer 3g, coupling agent 1g, stearic acid 0.5g, calcium stearate 0.5g; Add the lanthanum stannate (La stannate) prepared in the present invention respectively in sequence 2 sn 2 o 7 ) 2g, 5g, 10g, 15g.

[0029] The soft PVC sample without flame retardant was used as blank comparison A, and the PVC samples of Examples 1 to 4 and blank comparison A were oxygenated according to the methods ASTM D2863-2000 and GB / T 1040.1-2006 respectively. Index (LOI) and tensile properties test, the test results are shown in Table 1.

[0030] Table 1 Oxygen index (LOI) and tensile properties of soft PVC (DOP 40) samples added with lanthanum stannate

[0031]

[0032] (Note: The flame retardant efficiency is the ratio of the increased value of the LOI of the flame retardant sample to the added amount of the ...

Embodiment 5~20

[0036] Basic formula: PVC resin 100g, DOP 30g, organotin stabilizer 1g, coupling agent 1g, stearic acid 0.5g, calcium stearate 0.5g; In embodiment 5~20, add flame retardant respectively, and with The blank comparison B with flame retardant was added for comparison, see Table 2.

[0037] Table 2 Types and quantities of flame retardants added in Examples 5-20 and their oxygen index (LOI)

[0038]

[0039] (Note: Flame retardant efficiency = the ratio of the increase in LOI of the flame retardant sample to the amount of flame retardant added per 100g of PVC compared with blank comparison B)

[0040] It can be seen from Table 2 that when the amount of magnesium hydroxide added is 5g / 100gPVC or 10g / 100gPVC, the oxygen index of the corresponding flame-retardant soft PVC is not much different from that of soft PVC without adding a flame retardant, indicating that adding 5 parts Or 10 parts of magnesium hydroxide has basically no or little flame retardant effect on soft PVC. Ho...

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Abstract

The invention studies lanthanum stannate and an application of a composition of lanthanum stannate and an inorganic flame retardant in a halogen-containing superpolymer as a flame retardant. Results show that lanthanum stannate and a composition thereof have the effect of a flame retardant or synergist in the halogen-containing superpolymer, the application range of rare earth stannate is widened, and a new approach is provided for flame retardance of a superpolymer; a flame retardant effect (an oxygen index LOI is more than or equal to 30) can be achieved by adding a small amount (3-7%) of lanthanum stannate, and compared with the prior art, lanthanum stannate has the advantages of low addition amount and low deterioration degree on mechanical properties of a material, and even the elongation at break of the material can be improved.

Description

technical field [0001] The invention belongs to the application field of inorganic flame retardants, in particular to the application of lanthanum stannate and its composition with inorganic flame retardants in halogen-containing high polymers. Background technique [0002] Halogen-containing polymers refer to polymers that contain halogen in the polymer units that make up the polymer, such as polyvinyl chloride (PVC), chlorinated polypropylene resin (CPP), chlorinated EVA resin, chlorinated rubber, chlorosulfur Polyethylene, bromobutyl rubber, etc. Although the halogen-containing polymer itself contains halogen and has a certain flame-retardant effect, it will produce a large amount of hydrogen halide gas and toxic smoke during its thermal decomposition or combustion process, which hinders the evacuation of personnel and rescue work, causing Personnel are poisoned or even suffocated to death. At the same time, due to the strong corrosiveness of hydrogen halide, it will al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L101/04C08L27/06C08K3/24C08K3/22C08K3/38C08K3/02
Inventor 焦运红高俊刚徐建中李光明王欣
Owner HEBEI UNIVERSITY
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