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No droplet and no water stain based on dialkyl dithiophosphinate flame retardant polyurethane leather composition

A technology of dialkyl dithiophosphinate and polyurethane leather, which is applied in textiles and papermaking, and can solve problems such as poor flame retardancy, stickiness, and incompatibility

Active Publication Date: 2020-06-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the most widely used are ammonium polyphosphate (APP) with high degree of polymerization and organic phosphate, and ammonium polyphosphate (APP) flame retardant system with high degree of polymerization is an intumescent flame retardant system. Compared with the inorganic hydroxide system, the addition amount of APP is much lower than that of the inorganic hydroxide system. However, APP is still incompatible with the matrix material due to its hydrophilic surface and certain water solubility. Therefore, the flame-retardant polyurethane material of the APP system The mechanical strength is still very 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. After a period of time, there will be water droplets on the surface of polyurethane leather products, or after the leather is exposed to water, water stains will form on the surface of the product after drying, which will affect the appearance of the product. At the same time, it will be sticky. Hand feeling reduces the touch of polyurethane leather; while organic phosphates, some are still water-soluble, although some have low water solubility and overcome the problem of water stains, but their flame retardant mechanism belongs to condensed phase flame retardant, which is non-expanding. For non-intumescent flame retardant systems, polyurethane materials are prone to dripping when they catch fire, and the molten droplets will affect the flame retardant effect, so it is difficult to meet the requirements of the standard
[0007] In general, the main defects of the flame retardant system currently applied to polyurethane leather materials are: poor flame retardancy, easy to melt, easy to absorb moisture to form water spots, migration and whitening, etc.

Method used

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  • No droplet and no water stain based on dialkyl dithiophosphinate flame retardant polyurethane leather composition
  • No droplet and no water stain based on dialkyl dithiophosphinate flame retardant polyurethane leather composition
  • No droplet and no water stain based on dialkyl dithiophosphinate flame retardant polyurethane leather composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] Preparation of flame retardant components

[0063] (1) Preparation of aluminum diisobutyl dithiophosphite

[0064] Prepare respectively 1392g of sodium diisobutyldithiophosphite aqueous solution with a concentration of 20wt% and 228g of an aluminum sulfate solution with a concentration of 30wt%, add 1500g of desalted water in the reactor, and add 75g of a sulfuric acid solution with a concentration of 25wt%, and heat up to 80 ℃, start to add diisobutyl dithiophosphite sodium aqueous solution and aluminum sulfate solution synchronously to the reaction kettle in proportion to obtain diisobutyl dithiophosphite aluminum precipitate, dropwise complete in 2 hours, keep warm for 1 hour, then filtered, washed, and dried to obtain 254g (yield 97%) of diisobutyl aluminum dithiophosphite flame retardant.

[0065] After testing, the initial decomposition temperature of the product is 350°C, and its solubility in water is 0.02%;

[0066] (2) The preparation process of the carbon-f...

Embodiment 1

[0072] Polyurethane leather was prepared and characterized as follows:

[0073] (1) Prepare flame-retardant polyurethane resin composition by following formula:

[0074] Polyurethane resin base system 85%;

[0075] Aluminum Diisobutyldithiophosphite 11%;

[0076] Carbon-forming components 4%;

[0077] Wherein, by weight, the composition of the polyurethane resin base material system is:

[0078]

[0079] (2) Coat the above-mentioned flame retardant polyurethane composition on the polyester warp knitted fabric to form a coating with a thickness of 250 μm, dry and solidify it in a drier at 120°C for 3 minutes, and press it with a cloth binding machine, and heat it at 40°C Aged for 72 hours to obtain flame-retardant synthetic leather.

[0080] (3) Test related performance.

[0081] See Table 1 for the materials and their proportions in the examples, and see Table 1 for the performance test results of the obtained materials.

Embodiment 2

[0083] The implementation process is the same as in Example 1, except that the ratio of diisobutyl aluminum dithiophosphite and carbon-forming components is adjusted, the ratio of diisobutyl aluminum dithiophosphite is increased, and the total amount of the flame retardant system is kept constant. Change. 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 molten-drop-free and waterlogging-free dialkyldithiophosphate-based flame-retardant polyurethane leather composition. Flame-retardant polyurethane resin is taken as a surfacelayer. The flame-retardant polyurethane resin comprises the following raw material components in percentages by weight: 65-90% of a polyurethane base material system, 5-20% of dialkyldithiophosphateand 1-15% of a carbon formation component. The structural formula of the dialkyldithiophosphate is as shown in formula (I), in the formula, R1 and R2 are independently selected from unbranched chain alkyls or branched chain alkyls, 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 provided polyurethane leather composition can reach anautomotive interior material combustion testing standard of FMVSS (federal motor vehicle safety standards) No. 302.

Description

technical field [0001] The invention relates to the technical field of halogen-free flame-retardant polyurethane, in particular to a flame-retardant polyurethane leather composition based on dialkyl dithiophosphinate without molten drop and water stain. 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. Among them, synthetic leather is an important application of polyurethane materials. It has soft and natural luster, soft touch, and a strong leather-like appearance. It has excellent adhesion to the substrate, wear resistance, flex resistance, aging resistance, and It has excellent mechanical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/14D06N3/00C08G79/04
CPCC08G79/04D06N3/0061D06N3/0063D06N3/14D06N2209/067D06N2211/28
Inventor 雷华文韵豪李金忠
Owner ZHEJIANG UNIV
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