CN113861916A - Corrosion-resistant polyurethane hot melt adhesive and preparation method thereof - Google Patents

Corrosion-resistant polyurethane hot melt adhesive and preparation method thereof Download PDF

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Publication number
CN113861916A
CN113861916A CN202110968805.5A CN202110968805A CN113861916A CN 113861916 A CN113861916 A CN 113861916A CN 202110968805 A CN202110968805 A CN 202110968805A CN 113861916 A CN113861916 A CN 113861916A
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preparation
hot melt
polyurethane hot
melt adhesive
corrosion
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林铭煌
吴培煌
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Fujian Chandor Adhensive Science & Technology Co ltd
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Fujian Chandor Adhensive Science & Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • 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
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
    • 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
    • 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
    • C08G18/4269—Lactones
    • C08G18/4277—Caprolactone and/or substituted caprolactone
    • 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
    • C08G18/48—Polyethers
    • 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
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention discloses a corrosion-resistant polyurethane hot melt adhesive and a preparation method thereof in the technical field of polyurethane hot melt adhesives, wherein the corrosion-resistant polyurethane hot melt adhesive comprises 0-10 parts of amorphous polyester polyol, 10-20 parts of crystalline polyester polyol, 0-10 parts of liquid polyester polyol, 30-50 parts of polyether polyol (with the molecular weight of 1000), 15-30 parts of polycaprolactone, 0-15 parts of filler (nano CaCO3 and silicon micropowder) and 5-15 parts of MDI.

Description

Corrosion-resistant polyurethane hot melt adhesive and preparation method thereof
Technical Field
The invention relates to the technical field of polyurethane hot melt adhesives, in particular to a corrosion-resistant polyurethane hot melt adhesive and a preparation method thereof.
Background
With the progress of society and the ever-increasing environmental awareness and safety requirements of people, polyurethane adhesives are developing towards the direction of no pollution to people and environment. The solvent-based polyurethane adhesive seriously affects the living environment of people and the health of constructors due to the discharge of a large amount of solvent and high organic matters, so the moisture-curing polyurethane hot-melt adhesive is deeply concerned due to the excellent flexibility, impact resistance, high and low temperature resistance and water and solvent resistance.
The polyurethane hot melt adhesive is a solvent-free polyurethane adhesive, is solid at room temperature, is heated, melted and applied with glue, is cooled and solidified to generate primary bonding strength, and then reactive NCO groups in the adhesive layer react with moisture in the air, moisture attached to the surface of an adherend and reactive hydrogen groups to generate chemical crosslinking and solidification. And a cross-linked network structure is generated, so that the adhesive property of the hot melt adhesive is further improved. The polyurethane hot melt adhesive can not only bond polyurethane rubber and polyurethane sponge, but also bond rubber and plastics, rubber and fabrics, metal and ceramics, metal and rubber, metal, wood, leather and the like. But the corrosion resistance is not good enough.
Based on the above, the invention designs a corrosion-resistant polyurethane hot melt adhesive and a preparation method thereof, so as to solve the problems.
Disclosure of Invention
The invention aims to provide a corrosion-resistant polyurethane hot melt adhesive and a preparation method thereof, so as to solve the problem of poor corrosion resistance of the polyurethane hot melt adhesive in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a corrosion-resistant polyurethane hot melt adhesive comprises the following components in parts by weight: 0-10 parts of amorphous polyester polyol, 10-20 parts of crystalline polyester polyol, 0-10 parts of liquid polyester polyol, 30-50 parts of polyether polyol, 15-30 parts of polycaprolactone, 0-15 parts of filler and 5-15 parts of MDI, wherein the molecular weight of the polyether polyol is 1000.
Preferably, the filler is one or more of nano CaCO3 and silicon micropowder.
A preparation method of a corrosion-resistant polyurethane hot melt adhesive comprises the following steps:
a. putting polyether glycol into a reaction kettle, and starting heating and stirring until the materials are completely melted;
b. b, adding amorphous polyester polyol and liquid polyester polyol into the reaction kettle in the step a and stirring until the materials are completely melted;
c. b, putting the crystalline polyester polyol into the reaction kettle in the step a, stirring until the materials are completely melted, and stirring under vacuum at the temperature of 120-130 ℃ for more than 1h to remove water until the water content is not more than 500ppm to obtain a primary mixture;
d. reducing the temperature of the materials to 80 ℃, adding a liquid of a pure isocyanate monomer which is melted in advance or a powder of the pure isocyanate monomer which is warmed to normal temperature into the reaction kettle in the step a under the condition of nitrogen, stirring and reacting for 2 hours in vacuum at 80-100 ℃, testing the content of free NCO, and continuing the reaction until the content of the free NCO meets the requirement to obtain a secondary mixture if the content of the free NCO does not meet the requirement;
e. adding a catalyst and a functional auxiliary agent into the secondary mixture in the reaction kettle in the step a under the condition of nitrogen, and stirring for 15-30 min in vacuum to obtain polyurethane hot-melt glue;
f. b, adding polycaprolactone and a filler (nano CaCO3 and silicon micropowder) into the reaction kettle in the step a;
g. and f, heating the polyurethane hot melt adhesive obtained in the step f to 110 ℃, discharging and packaging after bubbles are discharged.
Preferably, the polyester polyol is one or more of amorphous, crystalline, or liquid.
Preferably, the MDI is one of diphenylmethane diisocyanates.
Preferably, in the step a, the temperature of the materials in the reaction kettle is controlled at 120-130 ℃, and the materials are heated for 2 h.
Preferably, in the steps b and c, the stirring speed of the materials in the reaction kettle is controlled to be 60-100r/min, and the stirring time is 1 h.
Preferably, in the step d, the temperature of the materials in the reaction kettle is 80-100 ℃, and the reaction time is 2 hours under vacuum stirring.
Preferably, in the step e, the vacuum stirring time of the materials in the reaction kettle is 15-30 min.
Compared with the prior art, the invention has the beneficial effects that: the invention has no harmful substance emission in the production process, does not use any solvent, and belongs to an environment-friendly adhesive. When in use, the operation process is simple, and the equipment investment is less. Compared with the existing polyurethane hot melt adhesive on the market, the product prepared by the invention has the advantages of low odor, good thermal stability and corrosion resistance.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The components are as follows:
Figure BDA0003224889180000031
a preparation method of a corrosion-resistant polyurethane hot melt adhesive comprises the following steps:
a. putting polyether glycol into a reaction kettle, starting heating and stirring, controlling the temperature of materials in the reaction kettle at 120-130 ℃, and heating for 2 h.
b. And c, adding amorphous polyester polyol and liquid polyester polyol into the reaction kettle in the step a, and stirring, wherein the stirring speed of materials in the reaction kettle is controlled to be 60-100r/min, and the stirring time is 1 h. Until the materials are completely melted;
c. b, putting the crystalline polyester polyol into the reaction kettle in the step a, stirring until the materials are completely melted, and stirring under vacuum at the temperature of 120-130 ℃ for more than 1h to remove water until the water content is not more than 500ppm to obtain a primary mixture; the stirring speed of the materials in the reaction kettle is controlled to be 60-100r/min, and the stirring time is 1 h.
d. And (b) reducing the temperature of the materials to 80 ℃, adding a liquid of a pure isocyanate monomer which is melted in advance or powder of the pure isocyanate monomer which is warmed to normal temperature into the reaction kettle in the step a under the condition of nitrogen, testing the content of free NCO, and if the content of free NCO is not satisfactory, continuing the reaction until the content of free NCO is less than 3 percent, thus obtaining a secondary mixture. The temperature of the materials in the reaction kettle is 80-100 ℃, and the reaction time is 2h under vacuum stirring.
e. And c, adding the catalyst and the functional auxiliary agent into the secondary mixture in the reaction kettle in the step a under the condition of nitrogen, and stirring for 15-30 min in vacuum to obtain the polyurethane hot-melt glue.
f. And (b) adding polycaprolactone and a filler (nano CaCO3 and silicon micropowder) into the reaction kettle in the step (a).
g. And f, heating the polyurethane hot melt adhesive obtained in the step f to 110 ℃, discharging and packaging after bubbles are discharged.
Example two
The components are as follows:
Figure BDA0003224889180000041
the preparation method is the same as that of example 1
EXAMPLE III
The components are as follows:
Figure BDA0003224889180000042
Figure BDA0003224889180000051
the preparation method is the same as that of example 1
Performance testing is given in the following Table
Figure BDA0003224889180000052
Note: means (-30 ℃ 6h-80 ℃ 6h, 6 cycles)
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (9)

1. The utility model provides a polyurethane hot melt adhesive of corrosion resistance which characterized in that: the paint comprises the following components in parts by weight: 0-10 parts of amorphous polyester polyol, 10-20 parts of crystalline polyester polyol, 0-10 parts of liquid polyester polyol, 30-50 parts of polyether polyol, 15-30 parts of polycaprolactone, 0-15 parts of filler and 5-15 parts of MDI, wherein the molecular weight of the polyether polyol is 1000.
2. The corrosion-resistant polyurethane hot melt adhesive according to claim 1, wherein: the filler is one or more of nano CaCO3 and silicon micropowder.
3. The preparation method of the corrosion-resistant polyurethane hot melt adhesive according to any one of claims 1-2, characterized by comprising the following steps: the method comprises the following steps:
a. putting polyether glycol into a reaction kettle, and starting heating and stirring until the materials are completely melted;
b. b, adding amorphous polyester polyol and liquid polyester polyol into the reaction kettle in the step a and stirring until the materials are completely melted;
c. b, putting the crystalline polyester polyol into the reaction kettle in the step a, stirring until the materials are completely melted, and stirring under vacuum at the temperature of 120-130 ℃ for more than 1h to remove water until the water content is not more than 500ppm to obtain a primary mixture;
d. reducing the temperature of the materials to 80 ℃, adding a liquid of a pure isocyanate monomer which is melted in advance or a powder of the pure isocyanate monomer which is warmed to normal temperature into the reaction kettle in the step a under the condition of nitrogen, stirring and reacting for 2 hours in vacuum at 80-100 ℃, testing the content of free NCO, and continuing the reaction until the content of the free NCO meets the requirement to obtain a secondary mixture if the content of the free NCO does not meet the requirement;
e. adding a catalyst and a functional auxiliary agent into the secondary mixture in the reaction kettle in the step a under the condition of nitrogen, and stirring for 15-30 min in vacuum to obtain polyurethane hot-melt glue;
f. b, adding polycaprolactone and a filler (nano CaCO3 and silicon micropowder) into the reaction kettle in the step a;
g. and f, heating the polyurethane hot melt adhesive obtained in the step f to 110 ℃, discharging and packaging after bubbles are discharged.
4. The preparation method of the corrosion-resistant polyurethane hot melt adhesive according to claim 3, wherein the preparation method comprises the following steps: the polyester polyol is one or more of amorphous, crystalline or liquid.
5. The preparation method of the corrosion-resistant polyurethane hot melt adhesive according to claim 3, wherein the preparation method comprises the following steps: the MDI is one of diphenylmethane diisocyanates.
6. The preparation method of the corrosion-resistant polyurethane hot melt adhesive according to claim 3, wherein the preparation method comprises the following steps: in the step a, the temperature of the materials in the reaction kettle is controlled at 120 ℃ and 130 ℃, and the materials are heated for 2 h.
7. The preparation method of the corrosion-resistant polyurethane hot melt adhesive according to claim 3, wherein the preparation method comprises the following steps: in the steps b and c, the stirring speed of the materials in the reaction kettle is controlled to be 60-100r/min, and the stirring time is 1 h.
8. The preparation method of the corrosion-resistant polyurethane hot melt adhesive according to claim 3, wherein the preparation method comprises the following steps: in the step d, the temperature of the materials in the reaction kettle is 80-100 ℃, and the reaction time is 2 hours under vacuum stirring.
9. The preparation method of the corrosion-resistant polyurethane hot melt adhesive according to claim 3, wherein the preparation method comprises the following steps: in the step e, the vacuum stirring time of the materials in the reaction kettle is 15-30 min.
CN202110968805.5A 2021-08-23 2021-08-23 Corrosion-resistant polyurethane hot melt adhesive and preparation method thereof Pending CN113861916A (en)

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