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A halogen-free flame retardant compound system for polyurethane based on dialkyl dithiophosphinate and its application

A technology of dialkyl dithiophosphinate and polyurethane, applied in polyurea/polyurethane coatings, insulators, plastic/resin/wax insulators, etc., can solve problems such as poor flame retardancy, whitening, and affecting product appearance, and achieve good compatibility

Active Publication Date: 2020-08-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used are ammonium polyphosphate (APP) with high polymerization degree and organic phosphates, ammonium polyphosphate (APP) flame retardant system with high polymerization degree, which belongs to an intumescent flame retardant system, because of its flame retardant Compared with the inorganic hydroxide system, the addition amount is much lower than that of the inorganic hydroxide system. However, APP is still incompatible with the base material due to its surface hydrophilic properties and certain water solubility. Therefore, the flame-retardant polyurethane material of the APP system The mechanical strength is still low, and at the same time, it is easy to migrate and precipitate, and the whitening phenomenon of precipitation occurs on the surface of the product
In addition, due to the presence of ammonium ions, APP is easy to absorb moisture, and water droplets will appear on the surface of the product after a period of time. If there are water droplets on the surface of polyurethane leather products, or after the leather is exposed to water, water spots will form on the surface of the product after drying. Affect the appearance of the product, and at the same time have a sticky feel, which reduces the touch of polyurethane leather; if there are water droplets on the surface of the TPU cable, the insulation performance of the material will be reduced, and there will be a major safety hazard
As for organic phosphates, some are still water-soluble, and although some are small in water solubility, they overcome the problems of water stains or lower cable insulation, but their flame retardant mechanism belongs to condensed phase flame retardant, which is non-expandable and non-expandable. Flame retardant system For polyurethane materials, it is easy to form drips when it is on fire, and the molten droplets will affect the flame retardant effect, and it is difficult to meet the requirements of the standard
[0009] In general, the main defects of the flame retardant system currently applied to polyurethane materials are: poor flame retardancy, easy to melt, easy to absorb moisture to form water spots or reduce insulation and migration whitening and other issues

Method used

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  • A halogen-free flame retardant compound system for polyurethane based on dialkyl dithiophosphinate and its application
  • A halogen-free flame retardant compound system for polyurethane based on dialkyl dithiophosphinate and its application
  • A halogen-free flame retardant compound system for polyurethane based on dialkyl dithiophosphinate and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The compound flame retardant system is applied to thermoplastic polyurethane TPU to prepare cable materials. According to the following steps and test methods to investigate the performance of flame retardants.

[0066] (1) Mixing of halogen-free flame retardant TPU system

[0067] Dry the TPU in advance, add TPU, compound flame retardant system and other additives that have been weighed in advance according to the proportion (if there is no special statement, the proportion in the present invention is weight percentage), start high-speed stirring, Stir for 10 minutes to complete the compounding of the halogen-free flame-retardant TPU system and discharge.

[0068] (2) Extrusion granulation of materials

[0069] Set the temperature of each zone of the twin-screw extruder at the predetermined temperature (the maximum temperature of the plasticizing section of the screw is 210°C). After the temperature stabilizes for 20 minutes, add a uniformly mixed halogen-free flame-...

Embodiment 2

[0087] The implementation process is the same as in Example 1, except that the ratio of aluminum diisobutyldithiophosphite and char-forming agent is adjusted, the ratio of aluminum diisobutyldithiophosphite is increased, and the total amount of the flame retardant system remains unchanged. . Other materials and proportioning are shown in Table 1, and the obtained material results are shown in Table 1.

Embodiment 3

[0089] The implementation process is the same as that of Example 1, except that the ratio of aluminum diisobutyldithiophosphite and char-forming agent is adjusted, the ratio of char-forming agent is increased, and the total amount of the flame retardant system remains unchanged. Other materials and proportioning are shown in Table 1, and the obtained material results are shown in Table 1.

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Abstract

The invention discloses a halogen-free flame retardant compounded system for polyurethane based on dialkyl dithio hypophosphite. The system comprises, in weight percent, 50-90wt% of dialkyl dithio hypophosphite and 10-50wt% of char-forming agents, the structural formula of the dialkyl dithio hypophosphite is as shown in a formula (I), R1 and R2 are independently selected from linear alkyl or branched alkyl, the carbon number of the linear alkyl or branched alkyl is 1-6, M is selected from Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, K, H or NH4, and m is 1-4. The novel halogen-free flame retardant compounded system for the polyurethane has the advantages of no molten drops, high flame resistance, migration resistance, no moisture absorption, good compatibility with basepolyurethane materials and the like.

Description

technical field [0001] The invention relates to the technical field of halogen-free flame retardants, in particular to a halogen-free flame-retardant composite system for polyurethane based on dialkyl dithiophosphinate, and its application in halogen-free flame-retardant polyurethane. Background technique [0002] Polyurethane is a type of polymer whose main chain contains -NHCOO- repeating structural units, abbreviated as PU in English, which is polymerized from isocyanate (monomer) and hydroxyl compound. Because it contains a strong polar carbamate group, it is insoluble in non-polar solvents, and has good oil resistance, toughness, wear resistance, aging resistance, etc., and has been widely used in many fields. [0003] Polyurethane includes two types of materials, one is thermosetting PU, which is usually used in synthetic leather, foaming and other fields; the other is thermoplastic polyurethane, referred to as TPU, which has the processing method of thermoplastic mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L85/02C08K5/5398C09D175/04C09D5/18C08G79/04H01B3/30D06N3/00D06N3/14
CPCC08G79/04C08L75/04C08L2201/02C08L2201/22C08L2203/202C09D5/18C09D175/04D06N3/0059D06N3/14H01B3/302C08L85/02C08K5/5398
Inventor 雷华文韵豪李金忠
Owner ZHEJIANG UNIV