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A flame-retardant polyurethane leather composition based on dialkyl monothiophosphinate without molten drops and water stains

An alkyl monothiohypophosphite, polyurethane leather technology, applied in polyurea/polyurethane coatings, textiles and papermaking, coatings, etc., can solve the problems of reduction, dripping, easy migration and precipitation, etc.

Active Publication Date: 2019-10-01
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 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
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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  • A flame-retardant polyurethane leather composition based on dialkyl monothiophosphinate without molten drops and water stains
  • A flame-retardant polyurethane leather composition based on dialkyl monothiophosphinate without molten drops and water stains
  • A flame-retardant polyurethane leather composition based on dialkyl monothiophosphinate without molten drops and water stains

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

Preparation of flame retardant components

(1) Preparation of diethyl monothioaluminum hypophosphate

Prepare 960g of 20wt% sodium diethylmonothiohypophosphite aqueous solution and 228g of 30wt% aluminum sulfate aqueous solution, add 1000g of desalinated water to the reactor, and add 50g of 25wt% sulfuric acid aqueous solution, and raise the temperature to 80℃ , Start to add the sodium diethyl monothiohypophosphite aqueous solution and the aluminum sulfate solution synchronously in proportion to the reaction kettle to obtain the precipitate of diethyl monothioaluminum hypophosphite. The dripping is completed in 2 hours, and the temperature is kept for 1 hour. After filtering, washing and drying, 166 g of diethyl aluminum monothiohypophosphite flame retardant (yield 95%) was obtained.

After testing, the initial decomposition temperature of the product is 345°C, and its water solubility is 0.05%.

(2) The preparation process of the carbon-forming component is as follows:

In a 1L ...

Embodiment 1

Example 1

Prepare and characterize polyurethane leather as follows:

(1) Prepare the flame-retardant polyurethane resin composition through the following formula:

Polyurethane resin base material system 84%;

Diethyl monothioaluminum hypophosphate 12%;

Carbon-forming component 4%;

Among them, in parts by weight, the composition of the polyurethane resin substrate system is:

(2) The flame-retardant polyurethane composition is coated on the polyester warp knitted fabric to form a coating with a thickness of 250μm. The coating is dried and cured in a dryer at 120°C for 3 minutes, and pressed with a cloth tie machine at 40°C. After 72 hours of aging, the flame retardant synthetic leather is obtained.

(3) Test related performance.

The materials and their proportions in the examples are shown in Table 1, and the performance test results of the obtained materials are shown in Table 1.

Embodiment 2

Example 2

The implementation process is the same as in Example 1, except for adjusting the ratio of diethyl monothioaluminum hypophosphite and carbon-forming components, the ratio of carbon-forming components is increased, and the total amount of the flame retardant system remains unchanged. See Table 1 for other materials and ratios, and see Table 1 for the results of the materials obtained.

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Abstract

The invention discloses a dialkyl mono-thiophosphate based flame-retardant polyurethane leather composition free of molten drops and water stains. Flame-retardant polyurethane resin serves as a surface layer and is prepared from, by weight, 65%-90% of polyurethane base material, 5%-20% of dialkyl mono-thiophosphate and 1%-15% of carbon formation components, wherein the structural formula of the dialkyl mono-thiophosphate is shown as the following formula (I) or (II), in the formula, R1 and R2 are independently selected from linear alkyl or branched alkyl, 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 polyurethane leather composition can reach the automotive interior material combustion test standard of the FMVSS (Federal Motor Vehicle Safety Standard) No.302.

Description

technical field 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 monothiophosphinate without molten drop and water stain. Background technique 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 properties suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/00D06N3/14C09D7/63C09D7/65C09D175/04
Inventor 雷华文韵豪
Owner ZHEJIANG UNIV
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