CN106633022B - A kind of preparation method and applications of three-source integrated dissaving structure fire retardant - Google Patents
A kind of preparation method and applications of three-source integrated dissaving structure fire retardant Download PDFInfo
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- CN106633022B CN106633022B CN201611065776.7A CN201611065776A CN106633022B CN 106633022 B CN106633022 B CN 106633022B CN 201611065776 A CN201611065776 A CN 201611065776A CN 106633022 B CN106633022 B CN 106633022B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4202—Two or more polyesters of different physical or chemical nature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Abstract
The invention discloses a kind of preparation method of " three-source integrated " dissaving structure fire retardant, include the following steps: Step 1: superbrnaching end-hydroxy polyester and phosphoric acid are added in reactor, addition phosphate-tungstic acid or p-methyl benzenesulfonic acid；Step 2: being warming up to 80 DEG C, react 4 hours under vacuum conditions；Step 3: after dry, being dissolved in acetone with ethanol washing；Step 4: being added and after reacting ethylenediamine 30 minutes of phosphoric acid equimolar ratio, obtaining sediment, washed three times with ethyl alcohol, obtains pale yellow powder after dry.It is mixed using fire retardant and acrylic acid, the PP etc. that the above method obtains, available viscosity is low, high mechanical properties polyurethane, fire-retardant PP.The invention also discloses the fire retardants that " three-source integrated " the dissaving structure fire retardant is used as high molecular material.
Description
Technical field
The invention belongs to technical field of flame retardant agent preparation, are about a kind of " three-source integrated " dissaving structure specifically
The preparation method and applications of fire retardant.
Background technique
Expandable flame retardant technology is the novel Flame Retardant Technology that mid-term grows up the 1990s.In expanding fire retardant
(IFR) when flame retardant plastics, frosting will form foamed char, plays the role of heat-insulated, oxygen barrier, suppression cigarette and prevents from melting drop, and
And low cigarette, low toxicity, without molten drop, non-corrosive gas generate.P-N type IFR is mainly with phosphorus, nitrogen, carbon compound resistance as main component
Combustion agent, mainly consists of three parts: (1) acid source, also known as charing catalyst or dehydrating agent, usually inorganic acid compound or inorganic
Acid has the function of that promotion carbide generates, and specific kind has: boric acid, ammonium phosphate salt, phosphate, phosphate and ammonium polyphosphate
(APP) etc.；(2) charcoal source, also known as carbon forming agent, the higher carbohydrate of mainly some phosphorus content or polyol, such as
Polymer itself (polyurethane etc.), starch, lignin, pentaerythrite (PER) and dipentaerythritol etc.；(3) gas source also known as foams
Source can release inert gas to make layer of charcoal expand, mainly contain nitrogen compound, and specific kind has: melamine, urine
Element, dicyandiamide, APP etc..IFR mainly plays fire retardation in condensed phase and forming porous foamed char, this layer of charcoal be by
What the following steps were formed: (1) generating the inorganic acid and polyesterification polyalcohol that can be used as dehydrating agent at a lower temperature；(2) slightly
At a temperature of high, esterification occurs, while some gas molecules may be released；(3) system before esterification or was esterified
It is melted in journey；(4) vapor that the non-flammable compressive gas and reaction generated by gas source generates keeps molten system further expanded foamed, with
This simultaneously, the further dehydration carbonization of Polyol Phosphate forms inorganic matter and char residue, and system is further expanded foamed；
(5) porous foam layer of charcoal is formed.
" three-source integrated " expansion type flame retardant is formed primarily as the small molecule of acid source, charcoal source and gas source at present, and such as three
Chlorethoxyfos (or phosphoric acid), melamine and pentaerythrite react to each other to obtain, and obtained molecular weight of product is little, with polymer phase
Capacitive is bad, and the presence of small molecule is easy to weaken the mechanical property of material.
Dissaving polymer is due to its unique molecular structure, so that it has some unique properties.Such as it is 1. good
Mobility.The random coil structure of the highly branched molecular structure of dissaving polymer and traditional line polymer
Difference, molecular structure is closer, has space three-dimensional stereochemical structure, shows as Newtonian fluid behavior, viscosity is also below identical
The line polymer of molecular weight.2. tailorable chemical property.Influence of the line polymer end group to polymer property is simultaneously unknown
It is aobvious, however hyperbranched polymer molecule surface has a large amount of functional end-group, property of these terminal groups to dissaving polymer
Matter has apparent influence.The property of dissaving polymer terminal groups affect the reactivity of dissaving polymer, viscosity, polarity,
Crystallinity and glass transition temperature.By modified, the property of polymer is changed end group, extends it using model
It encloses.Importantly, a large amount of active end group can carry out functional modification, dissaving polymer is made to have certain special function
Energy.
Summary of the invention
The first purpose of this invention is to provide a kind of preparation method of " three-source integrated " dissaving structure fire retardant.This
Phosphate amine salt is rolled into a ball using chemical property dissaving polymer a large amount of end groups and cut out and introduces dissaving polymer by invention
In, obtain the fire retardant of high nitrogen, high content of phosphorus.To Boltorn type superbrnaching end-hydroxy polyester dissaving polymer terminal hydroxy group base
Full modification, obtain a kind of addition type " three-source integrated " expansion type flame retardant；To Boltorn type Hyperbranched Polymer with Terminal Hydroxyl into
Row part terminal groups modification, can be obtained reactive flame retardant, and a part of terminal groups modification is phosphate ammonium salt groups, another part end hydroxyl
Base is changed to group containing double bonds (or retaining terminal hydroxy group), obtains response type " three-source integrated " expansion type flame retardant.
To achieve the above object, the invention adopts the following technical scheme:
A kind of preparation method of " three-source integrated " dissaving structure fire retardant, includes the following steps:
Step 1: superbrnaching end-hydroxy polyester and phosphoric acid are added in reactor, phosphate-tungstic acid is added or to first
Benzene sulfonic acid；
Step 2: being warming up to 80 DEG C, react 4 hours under vacuum conditions；
Step 3: after dry, being dissolved in acetone with ethanol washing；
Step 4: be added and after reacting ethylenediamine 30 minutes of phosphoric acid equimolar ratio, obtain sediment, washed three times with ethyl alcohol,
Pale yellow powder is obtained after drying.
According to the present invention, it when the molar ratio of the hydroxyl of the superbrnaching end-hydroxy polyester and phosphoric acid is less than 1:0.5, obtains anti-
Answer type " three-source integrated " dissaving structure fire retardant.
According to the present invention, when the molar ratio of the hydroxyl of the superbrnaching end-hydroxy polyester and phosphoric acid is greater than or equal to 1:0.5,
Obtain addition type " three-source integrated " dissaving structure fire retardant.
Second object of the present invention is to provide answering for above-mentioned " three-source integrated " dissaving structure fire retardant obtained
With " three-source integrated " the dissaving structure fire retardant is used as the fire retardant of high molecular material.
Third object of the present invention is to provide above-mentioned response type obtained " three-source integrated " dissaving structure fire-retardant
The application of agent, response type " three-source integrated " the dissaving structure fire retardant are used as the chain extender or glue connection of polyurethane reaction system
Agent.
The beneficial effects of the present invention are: dissaving polymer has good mobility and a large amount of cavitys, by " three sources one
Body " dissaving structure fire retardant is added in plastic material, and fire-retardant effect can be realized can improve process industrial art performance again
With improve mechanical property and other effects, be a kind of multi-functional fire retardant.
Specific embodiment
Below in conjunction with specific embodiment, to the preparation method of " three-source integrated " dissaving structure fire retardant of the invention make into
One step is described in detail.It should be understood that following embodiment is merely to illustrate the present invention not for limiting the scope of the invention.
Technology used in following embodiment is unless stated otherwise normal known to those skilled in the art
Rule technology；Used instrument and equipment etc., it is the research and technology people of general this field that only this specification, which especially indicates,
What member can be obtained by public approach.
The present invention using superbrnaching end-hydroxy polyester is charcoal source, phosphoric acid is acid source, ethylenediamine for gas source, by control charcoal source,
The molar ratio of acid source and gas source, and the reaction condition of reactor is controlled to prepare " three-source integrated " fire retardant.
The preparation of 1 response type of embodiment " three-source integrated " dissaving structure fire retardant
Step 1: superbrnaching end-hydroxy polyester and phosphoric acid are added in reactor, phosphate-tungstic acid is added or to first
Benzene sulfonic acid, the superbrnaching end-hydroxy polyester, phosphoric acid, catalyst molar ratio be 1:0.4:0.5%；
Step 2: being warming up to 80 DEG C, react 4 hours under vacuum conditions；
Step 3: after dry, being dissolved in acetone with ethanol washing；
Step 4: be added and after reacting ethylenediamine 30 minutes of phosphoric acid equimolar ratio, obtain sediment, washed three times with ethyl alcohol,
Pale yellow powder, i.e. response type " three-source integrated " dissaving structure fire retardant are obtained after drying.
The reaction equation of response type " three-source integrated " dissaving structure fire retardant is as follows:
Wherein,Indicate the internal structure of hyper-branched polyester, repetitive unit is
WithIndicate the Boltorn type hyper-branched polyester of different algebra, small tenon x
Indicate the hydroxyl and phosphatase reaction that there are the part x in Boltorn type hyper-branched polyester；Small tenon y indicates hyperbranched in Boltorn type
There is the hydroxyl of the part y to be not engaged in reaction in polyester.
The present embodiment before use, can first by superbrnaching end-hydroxy polyester dissolution in a solvent (acetone, dioxane,
Dimethyl sulfoxide etc.).
It is changed according to algebra, when the hydroxyl of the superbrnaching end-hydroxy polyester and the molar ratio of phosphoric acid are less than 1:0.5
When, the terminal hydroxy group of superbrnaching end-hydroxy polyester is partially modified, and reserved terminal hydroxy group can retain or further be modified to other
Group becomes reactive flame retardant.
The application of 2 response type of embodiment " three-source integrated " dissaving structure fire retardant
Response type " three-source integrated " dissaving structure fire retardant can be used as the chain extender or crosslinking agent of polyurethane reaction system,
Response type " three-source integrated " fire retardant as polyurethane system.Specific steps are as follows:
The flame-retardant modified hyper-branched polyester in part is mixed in certain proportion with polyester polyol, toluene di-isocyanate(TDI)
It closes, catalyst triphenyl bismuth is added, deaeration after mixing is put into mold in 60 DEG C of solidification 2d.Wherein, the polyester of the present embodiment
Polyalcohol can also be changed to the raw material of the polyurethane such as other polyalcohols, such as polyether polyol, polybutadiene polyol；Toluene two is different
Cyanate is also possible to other polyisocyanates.
Below by taking forth generation superbrnaching end-hydroxy polyester as an example, as chain extender and polyester polyol, toluene diisocynate
Polyurethane that ester is mixed to get and the mechanical property for testing its flame retardant property.See Table 1 for details for mixed proportion and result.
The flame-retardant modified hydroxyl hyper-branched polyester in 1 part of table is when mixed with polyester polyol, matching for toluene di-isocyanate(TDI)
Close the performance comparison of the polyurethane obtained
Conclusion: with the increase of chain extender, LOI value constantly increases, and the tensile strength of material gradually increases, elongation at break
It is gradually reduced, flame retardant effect is better.
The application of 3 response type of embodiment " three-source integrated " dissaving structure fire retardant
Response type " three-source integrated " dissaving structure fire retardant can be with monomer reaction containing double bonds (such as acrylic acid, oil
Acid etc.), available end group containing double bonds, the response type " three-source integrated " that can be used as olefines high molecular material is fire-retardant
Agent.By taking acrylic acid modified part end group as an example, reaction equation is as follows:
It is specific the preparation method is as follows:
The part end group of superbrnaching end-hydroxy polyester is flame-retardant modified, obtain the resistance of response type " three-source integrated " dissaving structure
Fire agent.In Boltorn type hyper-branched polyester, it is not engaged in the hydroxyl and double bond containing carboxylic acid reaction of the part y of reaction, is obtained
Double bond containing fire retardant.Such as: superbrnaching end-hydroxy polyester and the acrylic acid (hydroxyl moles of superbrnaching end-hydroxy polyester: third
Olefin(e) acid molal quantity is 1:0.2), it is added catalyst p-methyl benzenesulfonic acid (the 0.5% of acrylic acid molal quantity), water entrainer toluene is added,
It in 140 DEG C of 5~6h of reaction of oil bath, vacuumizes, reaction terminates to be washed with water, stand-by after dry.By above-mentioned product and excess phosphoric acid
(for example, the terminal hydroxy group molal quantity of modified hyper-branched polyester: the molal quantity of phosphoric acid is 1:0.6) is added in reactor, according to
Different algebra, 80 DEG C of phosphate-tungstic acid or p-methyl benzenesulfonic acid (the 0.5% of hydroxyl moles) is added, is reacted under vacuum condition
After 4 hours, ethanol washing.It after drying, is dissolved in acetone, reacting ethylenediamine 30 minutes with phosphoric acid equimolar ratio is then added
Afterwards, sediment is obtained, is washed three times with ethyl alcohol, obtains pale yellow powder after dry.
Above-mentioned double bond containing fire-retardant hyper-branched polyester and polypropylene (PP) with certain ratio of components in double screw extruder,
Thermomechanical reactive blending obtains fire-retardant PP.It is total as reactive flame retardant and PP containing the fire-retardant hyper-branched polyester of double bond using forth generation
It is mixed to obtain fire-retardant PP, performance such as the following table 2.
The proportion and its performance comparison of table 2 double bond containing fire-retardant hyper-branched polyester and PP
Conclusion:
(1) with the increase of response type " three-source integrated " dissaving structure flame retardant agent content, the oxygen index (OI) (LOI) of fire-retardant PP
Increase, fire-retardant rank improves, and illustrates that the combustibility of material reduces；
(2) with the increase of flame retardant agent content, the tensile strength of material is gradually increased；
(3) as flame retardant agent content increases, elongation at break reduces；
(4) with the increase of flame retardant agent content, the impact strength of material is gradually increased；
(5) with the increase of flame retardant agent content, the viscosity of material is gradually decreased.
In conclusion the addition of response type " three-source integrated " dissaving structure fire retardant helps to promote the mechanical property of material
Can, the viscosity of material is reduced, the processing and forming of material is facilitated.
The preparation of 4 addition type of embodiment " three-source integrated " dissaving structure fire retardant
Step 1: superbrnaching end-hydroxy polyester and phosphoric acid are added in reactor, phosphate-tungstic acid is added or to first
Benzene sulfonic acid, the superbrnaching end-hydroxy polyester, phosphoric acid, catalyst molar ratio be 1:0.6:0.5%；
Step 2: being warming up to 80 DEG C, react 4 hours under vacuum conditions；
Step 3: after dry, being dissolved in acetone with ethanol washing；
Step 4: be added and after reacting ethylenediamine 30 minutes of phosphoric acid equimolar ratio, obtain sediment, washed three times with ethyl alcohol,
Pale yellow powder, i.e. addition type " three-source integrated " dissaving structure fire retardant are obtained after drying.
The reaction equation of addition type " three-source integrated " dissaving structure fire retardant is as follows:
WhereinIndicate the Boltorn type hyper-branched polyester of different algebra；
Indicate the internal structure of hyper-branched polyester, repetitive unit is
It is changed according to algebra, when the hydroxyl of the superbrnaching end-hydroxy polyester and the molar ratio of phosphoric acid are greater than or equal to
When 1:0.5, the terminal hydroxy group of superbrnaching end-hydroxy polyester is all modified, becomes additive flame retardant.
The application of 5 addition type of embodiment " three-source integrated " dissaving structure fire retardant
Addition type " three-source integrated " dissaving structure fire retardant is used for Pp System, studies its flame retardant property, processing
Processing performance, mechanical property.Adjust fire retardant in Pp System content (quasi- addition 5%, 10%, 15%, 20%,
25%, the different contents such as 30%), the fire retardant of different content is studied to Flame Retardancy energy, process industrial art performance and mechanical property
The affecting laws of energy.
(1) by data or table, linear relationship etc., come illustrate the fire retardant of different content to Flame Retardancy energy plus
The affecting laws of work processing performance and mechanical property.It the results are shown in Table 3, table 3 is all modified superbrnaching end-hydroxy polyester and PP
It is mixed in a certain proportion the fire-retardant PP of acquisition.
Superbrnaching end-hydroxy polyester and PP that table 3 is all modified match the performance comparison of the fire-retardant PP when obtained
Conclusion:
(1) with the increase of addition type " three-source integrated " dissaving structure flame retardant agent content, the oxygen index (OI) (LOI) of fire-retardant PP
Increase, fire-retardant rank improves, and illustrates that the combustibility of material reduces；
(2) with the increase of flame retardant agent content, the tensile strength of material is first slight to be reduced, and is then increased, is finally slightly dropped
It is low but still bigger than the PP tensile strength of fire retardant is not added；
(3) as flame retardant agent content increases, elongation at break increases, and bending strength is gradually increased；
(4) with the increase of flame retardant agent content, the impact strength of material is first slight to be reduced, and is then increased, finally slightly
It reduces；
(5) with the increase of flame retardant agent content, the viscosity of material is gradually decreased.
In conclusion the addition of addition type " three-source integrated " dissaving structure fire retardant helps to promote the mechanical property of material
Can, the viscosity of material is reduced, the processing and forming of material is facilitated.
Embodiment 1-5 is flame-retardant modified by carrying out to superbrnaching end-hydroxy polyester, obtains nitrogenous and phosphorous end group, has
Good flame retardant effect, and with the addition of fire retardant, flame retardant property not only can be improved, viscosity, lifting force can also be reduced
Learn performance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the technology of the present invention, several improvements and modifications can also be made, for example, partially modified over-expense
The remaining end group for changing polyester can also do other modifications, such as anhydride modified, obtain " three-source integrated " fire retardant there are also carboxyl.
These modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (5)
1. a kind of preparation method of " three-source integrated " dissaving structure fire retardant, which comprises the steps of:
Step 1: superbrnaching end-hydroxy polyester and phosphoric acid are added in reactor, phosphate-tungstic acid is added or to toluene sulphur
Acid；
Step 2: being warming up to 80 DEG C, react 4 hours under vacuum conditions；
Step 3: after dry, being dissolved in acetone with ethanol washing；
Step 4: being added and after reacting ethylenediamine 30 minutes of phosphoric acid equimolar ratio, obtaining sediment, washed three times with ethyl alcohol, it is dry
After obtain pale yellow powder.
2. the preparation method of " three-source integrated " dissaving structure fire retardant as described in claim 1, which is characterized in that the end
When the hydroxyl of hydroxyl hyper-branched polyester and the molar ratio of phosphoric acid are greater than 1:0.5, response type " three-source integrated " dissaving structure is obtained
Fire retardant.
3. the preparation method of " three-source integrated " dissaving structure fire retardant as described in claim 1, which is characterized in that the end
When the hydroxyl of hydroxyl hyper-branched polyester and the molar ratio of phosphoric acid are less than or equal to 1:0.5, " three-source integrated " over-expense of addition type is obtained
Change structure fire retardant.
4. a kind of application of any one of such as claim 1-3 " three-source integrated " dissaving structure fire retardant obtained, feature
It is, " three-source integrated " the dissaving structure fire retardant is used as the fire retardant of high molecular material.
5. a kind of application of any one of such as claim 1-2 " three-source integrated " dissaving structure fire retardant obtained, feature
It is, " three-source integrated " the dissaving structure fire retardant is used as the chain extender or crosslinking agent of polyurethane reaction system.
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| CN107286370B (en) * | 2017-08-08 | 2019-06-25 | 青岛长荣化工科技有限公司 | A kind of nitrogen-phosphorus flame retardant and preparation method thereof |
| CN109252240B (en) * | 2018-07-26 | 2020-05-12 | 东华大学 | Melt direct spinning preparation method of flame-retardant antibacterial polyester fiber |
| CN109879907B (en) * | 2019-02-19 | 2021-09-14 | 四川大学 | Three-source integrated intumescent flame retardant, hybrid intumescent flame retardant grafted by three-source integrated intumescent flame retardant, and preparation methods and applications of three-source integrated intumescent flame retardant and hybrid intumescent flame retardant |
| CN110016130B (en) * | 2019-04-01 | 2021-08-03 | 东华大学 | Preparation method of phosphorus and nitrogen type flame retardant and flame-retardant fabric based on hyperbranched polyester |
| CN110592950B (en) * | 2019-09-16 | 2021-08-06 | 东华大学 | Method for preparing flame-retardant cotton fabric without solvent |
| CN110983784B (en) * | 2019-12-17 | 2022-07-12 | 太仓宝霓实业有限公司 | Improved environment-friendly flame retardant composition and preparation method thereof |
| CN112724365B (en) * | 2020-11-30 | 2022-10-14 | 温州大学 | Flame-retardant hyperbranched polymer leather retanning agent |
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