Moisture-curing polyurethane hot melt adhesive with excellent oil resistance and preparation method of moisture-curing polyurethane hot melt adhesive

Abstract

The invention discloses a moisture-curing polyurethane hot melt adhesive with excellent oil resistance and a preparation method of the moisture-curing polyurethane hot melt adhesive. The moisture-curing polyurethane hot melt adhesive is characterized by being prepared from 1-35 parts of polyether diols, 1-40 parts of liquid polyester diols, 1-60 parts of crystalline polyester diols, 1-45 parts ofa polyacrylic acid fluorine-containing copolymer, 1-50 parts of isocyanate, 0.1-2 parts of a catalyst, 0.1-3 parts of an antioxidant and 0.1-4 parts of a silane coupling agent. Poly(dodecafluoroheptylmethacrylate-random-methyl methacrylate-random-octadecyl methacrylate-random-hydroxyethyl methylacrylate) is synthesized firstly and added to a polyurethane prepolymer reaction, a hydroxy-containingacrylic acid functional monomer enables the polyacrylic acid fluorine-containing copolymer to partially participate in the polyurethane prepolymer synthesis reaction, a fluorinated acrylate copolymerchain segment is introduced, by means of an efficient synergistic effect of the formula, the hot melt adhesive shows better compatibility, composition and content of other raw materials are further adjusted, and therefore, oil resistance of the polyurethane hot melt adhesive is improved.

Description

technical field

[0001] The invention belongs to the technical field of structural adhesives, and in particular relates to a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance and a preparation method thereof, which are mainly used in the electronics and electrical appliances industry, the automobile industry, the textile and shoemaking industry, the food packaging industry, Structural bonding in wood processing and furniture industry. Background technique

[0002] Polyurethane hot-melt adhesive is a new generation of structural adhesive that can provide excellent bonding properties. Polyurethane hot-melt adhesive is easy to use, environmentally friendly, and its performance is comparable to solvent-based hot-melt adhesives. In the past ten years, polyurethane hot melt adhesives have been rapidly developed and widely used in high-end fields such as the electronics and electrical appliances industry and the automotive industry. Polyurethane hot melt...

Examples

Embodiment 1

[0027] It is a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance, which is prepared by the following steps:

[0028] Step 1: Synthesis of polyacrylic acid fluorocopolymer

[0029] 20 parts of dodecafluoroheptyl methacrylate DFMA, 20 parts of methyl methacrylate MMA, 20 parts of octadecyl methacrylate SMA and 4 parts of hydroxyethyl methacrylate HEMA were dissolved in 60 parts of In toluene, controlled at 85 ° C, under nitrogen protection, 1.9 parts of thermal initiator 2-ethylhexanoate tert-amyl peroxide was added, and the polymerization reaction was carried out for 30 hours. After the toluene was removed by rotary evaporation, a polyacrylic acid fluorine-containing copolymer was obtained. , the number average molecular weight of the polyacrylic acid fluorine-containing copolymer is 14000, and its chemical structure is: poly(dodecafluoroheptyl methacrylate-random-methyl methacrylate-random-octadecyl methacrylate-no Gauge-hydroxyethyl methacrylate) i...

Embodiment 2

[0033] It is a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance, which is prepared by the following steps:

[0034] Step 1: Synthesis of polyacrylic acid fluorocopolymer

[0035]25 parts of dodecafluoroheptyl methacrylate DFMA, 30 parts of methyl methacrylate MMA, 10 parts of octadecyl methacrylate SMA and 6 parts of hydroxyethyl methacrylate HEMA were dissolved in 70 parts of In toluene, controlled at 90 ° C, under nitrogen protection, 1.7 parts of thermal initiator 2-ethylhexanoate tert-amyl peroxide was added, and the polymerization reaction was carried out for 20 hours. After the toluene was removed by rotary evaporation, a polyacrylic acid fluorine-containing copolymer was obtained. , the number average molecular weight of the polyacrylic acid fluorine-containing copolymer is 22000, and its chemical structure is: poly(dodecafluoroheptyl methacrylate-random-methyl methacrylate-random-octadecyl methacrylate-no Gauge-hydroxyethyl methacrylate) is...

Embodiment 3

[0039] It is a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance, which is prepared by the following steps:

[0040] Step 1: Synthesis of polyacrylic acid fluorocopolymer

[0041] 35 parts of dodecafluoroheptyl methacrylate DFMA, 30 parts of methyl methacrylate MMA, 20 parts of octadecyl methacrylate SMA and 8 parts of hydroxyethyl methacrylate HEMA were dissolved in 90 parts of In toluene, controlled at 95 ℃, under nitrogen protection, add 0.7 parts of thermal initiator 2-ethylhexanoate tert-amyl peroxide, polymerize for 10 hours, remove toluene by rotary evaporation, and obtain polyacrylic acid fluorine-containing copolymer , the number average molecular weight of the polyacrylic acid fluorine-containing copolymer is 32000, and its chemical structure is: poly(dodecafluoroheptyl methacrylate-random-methyl methacrylate-random-octadecyl methacrylate-no Gauge-hydroxyethyl methacrylate) is P (DFMA-r-MMA-r-SMA-r-HEMA).

[0042] Step 2: Synthesize moist...

technical field

[0001] The invention belongs to the technical field of structural adhesives, and in particular relates to a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance and a preparation method thereof, which are mainly used in the electronics and electrical appliances industry, the automobile industry, the textile and shoemaking industry, the food packaging industry, Structural bonding in wood processing and furniture industry. Background technique

[0002] Polyurethane hot-melt adhesive is a new generation of structural adhesive that can provide excellent bonding properties. Polyurethane hot-melt adhesive is easy to use, environmentally friendly, and its performance is comparable to solvent-based hot-melt adhesives. In the past ten years, polyurethane hot melt adhesives have been rapidly developed and widely used in high-end fields such as the electronics and electrical appliances industry and the automotive industry. Polyurethane hot melt...

Examples

Embodiment 1

[0027] It is a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance, which is prepared by the following steps:

[0028] Step 1: Synthesis of polyacrylic acid fluorocopolymer

[0029] 20 parts of dodecafluoroheptyl methacrylate DFMA, 20 parts of methyl methacrylate MMA, 20 parts of octadecyl methacrylate SMA and 4 parts of hydroxyethyl methacrylate HEMA were dissolved in 60 parts of In toluene, controlled at 85 ° C, under nitrogen protection, 1.9 parts of thermal initiator 2-ethylhexanoate tert-amyl peroxide was added, and the polymerization reaction was carried out for 30 hours. After the toluene was removed by rotary evaporation, a polyacrylic acid fluorine-containing copolymer was obtained. , the number average molecular weight of the polyacrylic acid fluorine-containing copolymer is 14000, and its chemical structure is: poly(dodecafluoroheptyl methacrylate-random-methyl methacrylate-random-octadecyl methacrylate-no Gauge-hydroxyethyl methacrylate) i...

Embodiment 2

[0033] It is a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance, which is prepared by the following steps:

[0034] Step 1: Synthesis of polyacrylic acid fluorocopolymer

[0035]25 parts of dodecafluoroheptyl methacrylate DFMA, 30 parts of methyl methacrylate MMA, 10 parts of octadecyl methacrylate SMA and 6 parts of hydroxyethyl methacrylate HEMA were dissolved in 70 parts of In toluene, controlled at 90 ° C, under nitrogen protection, 1.7 parts of thermal initiator 2-ethylhexanoate tert-amyl peroxide was added, and the polymerization reaction was carried out for 20 hours. After the toluene was removed by rotary evaporation, a polyacrylic acid fluorine-containing copolymer was obtained. , the number average molecular weight of the polyacrylic acid fluorine-containing copolymer is 22000, and its chemical structure is: poly(dodecafluoroheptyl methacrylate-random-methyl methacrylate-random-octadecyl methacrylate-no Gauge-hydroxyethyl methacrylate) is...

Embodiment 3

[0039] It is a moisture-curing polyurethane hot-melt adhesive with excellent oil resistance, which is prepared by the following steps:

[0040] Step 1: Synthesis of polyacrylic acid fluorocopolymer

[0041] 35 parts of dodecafluoroheptyl methacrylate DFMA, 30 parts of methyl methacrylate MMA, 20 parts of octadecyl methacrylate SMA and 8 parts of hydroxyethyl methacrylate HEMA were dissolved in 90 parts of In toluene, controlled at 95 ℃, under nitrogen protection, add 0.7 parts of thermal initiator 2-ethylhexanoate tert-amyl peroxide, polymerize for 10 hours, remove toluene by rotary evaporation, and obtain polyacrylic acid fluorine-containing copolymer , the number average molecular weight of the polyacrylic acid fluorine-containing copolymer is 32000, and its chemical structure is: poly(dodecafluoroheptyl methacrylate-random-methyl methacrylate-random-octadecyl methacrylate-no Gauge-hydroxyethyl methacrylate) is P (DFMA-r-MMA-r-SMA-r-HEMA).

[0042] Step 2: Synthesize moist...

Images