CN107118329B - Water-based anion-blocked polyisocyanate crosslinking agent containing polyester structure and preparation method thereof - Google Patents

Water-based anion-blocked polyisocyanate crosslinking agent containing polyester structure and preparation method thereof Download PDF

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CN107118329B
CN107118329B CN201710453114.5A CN201710453114A CN107118329B CN 107118329 B CN107118329 B CN 107118329B CN 201710453114 A CN201710453114 A CN 201710453114A CN 107118329 B CN107118329 B CN 107118329B
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polyester structure
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polyisocyanate crosslinking
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CN107118329A (en
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韦军
吕剑伟
孙祥
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Yangcheng Institute of Technology
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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
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/80—Masked polyisocyanates
    • C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
    • C08G18/807—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with nitrogen containing compounds
    • 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
    • C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
    • C08G18/4286—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones prepared from a combination of hydroxycarboxylic acids and/or lactones with polycarboxylic acids or ester forming derivatives thereof and polyhydroxy compounds
    • 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
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/80—Masked polyisocyanates
    • C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
    • C08G18/807—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with nitrogen containing compounds
    • C08G18/8074—Lactams
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/18—Fireproof paints including high temperature resistant paints

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  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a water-based anion-blocked polyisocyanate cross-linking agent containing a polyester structure and a preparation method thereof. Reacting diacid chloride with trimethylolpropane to form a high-molecular skeleton with a polyester structure, carrying out hydrophilic chain extension on the skeleton by using an ionic hydrophilic chain extender, sealing residual active hydroxyl by using a semi-closed polyurethane prepolymer, and neutralizing an ionic group on the skeleton structure by using triethylamine to obtain the water-based anion-sealed polyisocyanate cross-linking agent with the polyester structure. The introduction of the polyester structure obviously improves the heat resistance and the mechanical property of the water-based resin cured coating, so the cross-linking agent has wide application prospect in the field of water-based paint curing.

Description

Water-based anion-blocked polyisocyanate crosslinking agent containing polyester structure and preparation method thereof
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a water-based anion-blocked polyisocyanate crosslinking agent containing a polyester structure and a preparation method thereof.
Background
The water-based polyisocyanate cross-linking agent is applied to a water-based coating system, and a coating layer obtained after curing has the characteristics of excellent low-temperature resistance, wear resistance, solvent washing resistance and the like, so that the water-based polyisocyanate cross-linking agent is widely applied to the fields of paper and leather finishing, textile printing, industrial corrosion prevention, wood coating and the like. However, when the temperature is higher than 80 ℃, the mechanical properties of the cured coating are basically lost, and the cured coating is decomposed greatly at 250 ℃, which greatly limits the application field of the water-based polyisocyanate crosslinking agent. Therefore, the improvement of the high temperature resistance of the water-based polyisocyanate crosslinking agent has important practical significance for further widening the application field of the water-based coating.
S.S.Pathak et al (Progress in Organic Coatings,2009,65(2):206) adopt sol-gel technology, polyurethane, hexamethoxy methyl melamine resin and Organic silicon, such as methyl trimethoxy silane and gamma-epoxy propoxy propyl trimethoxy silane, as raw materials to synthesize the Organic silicon waterborne polyurethane coating for protecting aluminum and aluminum alloy, and TGA results show that the initial weight loss temperature is increased to 206 ℃, and the heat resistance is obviously improved. Zhengyan (polyurethane industry, 2010,25(1):20) adopts isophorone diisocyanate, polytetrahydrofuran ether, perfluoroalcohol and the like as raw materials to synthesize the anionic fluorine-containing aqueous polyurethane emulsion, and thermogravimetric analysis results show that the initial decomposition temperature of the aqueous polyurethane is increased by 40 ℃ due to the introduction of perfluoroalkyl, and the thermal stability is improved.
The modification method can effectively improve the heat resistance of a curing system, but the modifiers of organic silicon and organic fluorine are expensive, so that the production cost of the product is increased, the competitive advantage is reduced, and the popularization difficulty is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a water-based anion-blocked polyisocyanate crosslinking agent containing a polyester structure and a preparation method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that:
an aqueous anion-blocked polyisocyanate crosslinking agent containing a polyester structure, which has the following structural formula
Figure BDA0001323016170000021
In the formula, R1Is composed ofM is
Figure BDA0001323016170000023
R2Is composed of
Figure BDA0001323016170000024
R3Is composed of
Figure BDA0001323016170000025
Figure BDA0001323016170000026
R4Is composed of
Figure BDA0001323016170000027
R5Is composed of
Figure BDA0001323016170000028
Figure BDA0001323016170000029
B is
Figure BDA00013230161700000210
The preparation method of the water-based anion-blocked polyisocyanate crosslinking agent containing the polyester structure is carried out by stirring under the protection of nitrogen in the whole process, and the components are weighed according to the parts by weight and added into a reaction system, and specifically comprises the following steps: step 1, adding 15.0-30.0 parts of diisocyanate and 10.0-25.0 parts of N-methyl-2-pyrrolidone into a four-neck flask, uniformly stirring, heating to 60-90 ℃ within 4-8min, adding 5.0-20.0 parts of sealing agent into a reaction system within 5-15 min, and carrying out heat preservation reaction for 2.0-4.0 h to obtain a semi-closed polyisocyanate prepolymer; step 2, adding 5.0-25.0 parts of triethylamine, 4.0-12.0 parts of trimethylolpropane, 40.0-60.0 parts of N-methyl-2-pyrrolidone and 15.0-25.0 parts of diacyl chloride into a four-neck flask, adjusting the temperature to 20-60 ℃, carrying out heat preservation reaction for 4.0-8.0 h, then adding 5.0-15.0 parts of triethylamine into the system, adding 10.0-25.0 parts of ionic hydrophilic chain extender into the reaction system within 15-25 min, adjusting the temperature to 20-60 ℃, and carrying out heat preservation reaction for 4.0-8.0 h to obtain a component I; and 3, slowly heating the component I to 60-90 ℃, adding the semi-closed polyisocyanate prepolymer obtained in the step 1 into a reaction system within 10-25 min, carrying out heat preservation reaction for 1.0-4.0 h, cooling to 30 ℃, adding 8.0-20.0 parts of triethylamine, and stirring for 20-60 min to obtain the water-based anion-closed polyisocyanate crosslinking agent containing the polyester structure.
The improvement is that the diisocyanate in the step 1 is any one of hexamethylene diisocyanate, isophorone diisocyanate or dicyclohexylmethane diisocyanate.
The improvement is that the blocking agent in the step 1 is 3, 5-dimethylpyrazole, triazole, butanone oxime, imidazole or caprolactam.
As a modification, the diacid chloride in step 2 is oxalyl chloride, malonyl chloride, succinyl chloride, glutaryl chloride or adipoyl chloride.
The improvement is that the ionic hydrophilic chain extender in the step 2 is 2, 2-dimethylolpropionic acid or 2, 2-dimethylolbutyric acid.
The reaction equation of the invention is as follows:
wherein, the synthesis of the semi-closed polyisocyanate prepolymer:
Figure BDA0001323016170000031
synthesis of aqueous anionic blocked polyisocyanate crosslinking agent containing polyester structure:
Figure BDA0001323016170000032
Figure BDA0001323016170000041
advantageous effects
The invention relates to a water-based anion-blocked polyisocyanate crosslinking agent containing a polyester structure and a preparation method thereof. Reacting diacid chloride with trimethylolpropane to form a high-molecular skeleton with a polyester structure, carrying out hydrophilic chain extension on the skeleton by using an ionic hydrophilic chain extender, sealing residual active hydroxyl by using a semi-closed polyurethane prepolymer, and neutralizing an ionic group on the skeleton structure by using triethylamine to obtain the water-based anion-sealed polyisocyanate cross-linking agent with the polyester structure. The introduction of the polyester structure obviously improves the heat resistance and the mechanical property of the water-based resin cured coating, so the cross-linking agent has wide application prospect in the field of water-based paint curing.
Drawings
FIG. 1 shows an infrared spectrum of an aqueous anion-blocked polyisocyanate crosslinking agent having a polyester structure obtained in example 1.
FIG. 2 shows an infrared spectrum of an aqueous anion-blocked polyisocyanate crosslinking agent having a polyester structure obtained in example 2.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the following examples.
Example 1
A preparation method of an aqueous anion-blocked polyisocyanate crosslinking agent containing a polyester structure comprises the following steps: the whole process is carried out under the protection of nitrogen, and the components are weighed according to the parts by weight and added into a reaction system, and the method specifically comprises the following steps: step 1, adding 19.8 parts of hexamethylene diisocyanate and 20.0 parts of N-methyl-2-pyrrolidone into a four-neck flask, uniformly stirring, heating to 75 ℃ within 5min, adding 8.0 parts of imidazole into a reaction system within 15min, and carrying out heat preservation reaction for 3.0h to obtain a semi-closed polyisocyanate prepolymer; step 2, adding 19.9 parts of triethylamine, 8.8 parts of trimethylolpropane, 60.0 parts of N-methyl-2-pyrrolidone and 20.0 parts of oxalyl chloride into a four-neck flask, adjusting the temperature to 20 ℃, carrying out heat preservation reaction for 6.0h, then adding 11.9 parts of triethylamine into the system, adding 15.8 parts of 2, 2-dimethylolpropionic acid into the reaction system within 15min, adjusting the temperature to 20 ℃, and carrying out heat preservation reaction for 6.0h to obtain a component I; and 3, slowly heating the component I to 65 ℃, adding the semi-closed polyisocyanate prepolymer obtained in the step 1 into a reaction system within 20min, carrying out heat preservation reaction for 2.0h, cooling to 30 ℃, adding 8.5 parts of triethylamine, and stirring for 30min to obtain the water-based anion-closed polyisocyanate crosslinking agent containing the polyester structure.
The crosslinking agent prepared in example 1 is stored for more than 6 months at normal temperature, the solid content is 58.5 percent, and the isocyanate content is 6.8 percent; FT-IR (KBr, cm)-1)：3354(N-H)，2952(-CH3,-CH2-, 1706(C ═ O), 1588 (C-N); FIG. 1 shows an infrared spectrum of an aqueous anion-blocked polyisocyanate crosslinking agent having a polyester structure obtained in example 1.
Example 2
A preparation method of an aqueous anion-blocked polyisocyanate crosslinking agent containing a polyester structure comprises the following steps: the whole process is carried out under the protection of nitrogen, and the components are weighed according to the parts by weight and added into a reaction system, and the method specifically comprises the following steps: step 1, adding 27.1 parts of 4, 4' -dicyclohexylmethane diisocyanate and 20.0 parts of N-methyl-2-pyrrolidone into a four-neck flask, uniformly stirring, heating to 80 ℃ within 7min, adding 11.7 parts of caprolactam into a reaction system within 10min, and carrying out heat preservation reaction for 4.0h to obtain a semi-closed polyisocyanate prepolymer; step 2, adding 11.6 parts of triethylamine, 5.1 parts of trimethylolpropane, 60.0 parts of N-methyl-2-pyrrolidone and 20.0 parts of adipoyl chloride into a four-neck flask, adjusting the temperature to 40 ℃, carrying out heat preservation reaction for 6.0 hours, then adding 10.5 parts of triethylamine into the system, adding 15.3 parts of 2, 2-dimethylolbutyric acid into the reaction system within 15 minutes, adjusting the temperature to 40 ℃, and carrying out heat preservation reaction for 6.0 hours to obtain a component I; and 3, slowly heating the component I to 65 ℃, adding the semi-closed polyisocyanate prepolymer obtained in the step 1 into a reaction system within 15min, carrying out heat preservation reaction for 2.0h, cooling to 30 ℃, adding 9.2 parts of triethylamine, and stirring for 30min to obtain the water-based anion-closed polyisocyanate crosslinking agent containing the polyester structure.
The crosslinking agent prepared in example 2 is stored for more than 6 months at normal temperature, the solid content is 58.0 percent, and the isocyanate content is 5.5 percent; FT-IR (KBr, cm)-1)：3354(N-H)，2952(-CH3,-CH2-, 1706(C ═ O), 1588 (C-N); FIG. 2 shows an infrared spectrum of an aqueous anion-blocked polyisocyanate crosslinking agent having a polyester structure obtained in example 2.

Claims (6)

1. The water-based anion-blocked polyisocyanate crosslinking agent containing the polyester structure is characterized by having the following structural formula
Figure FDA0002263679600000011
Figure FDA00022636796000000111
In the formula, R1Is composed of
Figure FDA0002263679600000012
M is
Figure FDA0002263679600000013
R2Is composed of
Figure FDA0002263679600000014
R3Is composed of
Figure FDA0002263679600000015
R4Is composed of
Figure FDA0002263679600000016
R5Is composed of
Figure FDA0002263679600000017
Figure FDA0002263679600000018
B is
Figure FDA0002263679600000019
Figure FDA00022636796000000110
2. The preparation method of the polyester structure-containing water-based anion-blocked polyisocyanate crosslinking agent according to claim 1, wherein the whole process is carried out under the protection of nitrogen gas and stirring, and the components are weighed and added into a reaction system according to parts by weight, and the method specifically comprises the following steps: step 1, adding 15.0-30.0 parts of diisocyanate and 10.0-25.0 parts of N-methyl-2-pyrrolidone into a four-neck flask, uniformly stirring, heating to 60-90 ℃ within 4-8min, adding 5.0-20.0 parts of sealing agent into a reaction system within 5-15 min, and carrying out heat preservation reaction for 2.0-4.0 h to obtain a semi-closed polyisocyanate prepolymer; step 2, adding 5.0-25.0 parts of triethylamine, 4.0-12.0 parts of trimethylolpropane, 40.0-60.0 parts of N-methyl-2-pyrrolidone and 15.0-25.0 parts of diacyl chloride into a four-neck flask, adjusting the temperature to 20-60 ℃, carrying out heat preservation reaction for 4.0-8.0 h, then adding 5.0-15.0 parts of triethylamine into the system, adding 10.0-25.0 parts of ionic hydrophilic chain extender into the reaction system within 15-25 min, adjusting the temperature to 20-60 ℃, and carrying out heat preservation reaction for 4.0-8.0 h to obtain a component I; and 3, slowly heating the component I to 60-90 ℃, adding the semi-closed polyisocyanate prepolymer obtained in the step 1 into a reaction system within 10-25 min, carrying out heat preservation reaction for 1.0-4.0 h, cooling to 30 ℃, adding 8.0-20.0 parts of triethylamine, and stirring for 20-60 min to obtain the water-based anion-closed polyisocyanate crosslinking agent containing the polyester structure.
3. The method for preparing the aqueous anion-blocked polyisocyanate crosslinking agent having a polyester structure according to claim 2, wherein the diisocyanate in the step 1 is any one of hexamethylene diisocyanate, isophorone diisocyanate or dicyclohexylmethane diisocyanate.
4. The method for preparing the water-based anion-blocked polyisocyanate crosslinking agent containing the polyester structure according to claim 2, wherein the blocking agent in the step 1 is 3, 5-dimethylpyrazole, triazole, butanone oxime, imidazole or caprolactam.
5. The method for preparing the aqueous anion-blocked polyisocyanate crosslinking agent having a polyester structure according to claim 2, wherein the diacid chloride in the step 2 is oxalyl chloride, malonyl chloride, succinyl chloride, glutaryl chloride or adipoyl chloride.
6. The method for preparing the aqueous anion-blocked polyisocyanate crosslinking agent containing the polyester structure according to claim 2, wherein the ionic hydrophilic chain extender in the step 2 is 2, 2-dimethylolpropionic acid or 2, 2-dimethylolbutyric acid.
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EP0942023B1 (en) * 1998-03-12 2004-09-15 Bayer MaterialScience AG Aqueous polyisocyanate crosslinker with hydroxypivalic acid and blocked with dimethylpyrazole

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