A kind of reactive polyurethane hot melt adhesive and preparation method thereof
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A polyurethane hot-melt adhesive, reactive technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc. PUR and other issues, to achieve the effect of good heat resistance, wide application range and good tolerance
Active Publication Date: 2021-05-04
CHENGDU GUIBAO SCI & TECH +1
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Problems solved by technology
[0009] It can be seen from the above inventions that it is still difficult to obtain PUR that can guarantee good bonding performance in the environment of water immersion, high humidity and high temperature shock in the market.
For example, after soaking in water and being subjected to high temperature and humidity, it is generally difficult to maintain the bond strength retention rate to 70%. After curing, the water permeability is too strong, and it is especially prone to problems when used in hot and humid environments.
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Embodiment 1
[0040] The reactive polyurethane hot-melt adhesive of the present embodiment, the raw material composition is as follows:
[0041] raw material parts by weight Polypropylene glycol Mn=2000 45 Poly adipate polyester diol Mn=3000 32 Toluene diisocyanate 16 Hydroxy-terminated acrylate-carbonate copolymer resin Mn=2500 5.5 Additives to enhance water resistance 1 1.25 Dibutyltin dilaurate, dibutyltin diacetate (1:2 mixture by weight) 0.25
[0042] Among them: the structure of additive 1 for enhancing water resistance is:
[0043]
[0044] The preparation method of the reactive polyurethane hot-melt adhesive of the present embodiment follows the steps:
[0045] Step 1. Put polypropylene glycol, polyadipate polyester diol, and hydroxy-terminated acrylate-carbonate copolymer resin into the reaction kettle according to the metering ratio, heat at 120° C., and vacuum dehydrate for 2 hours under stirring.
[0046] Step 2, drop the te...
Embodiment 2
[0049] The reactive polyurethane hot-melt adhesive of the present embodiment, the raw material composition is as follows:
[0050]
[0051]
[0052] Among them: the structure of additive 2 for enhancing water resistance is:
[0053]
[0054] The preparation method of this embodiment follows the steps:
[0055] Step 1: Put polypropylene glycol, polyadipate polyester diol, and hydroxyl-terminated acrylate-carbonate copolymer resin into the reaction kettle according to the metering ratio, heat at 140° C., and vacuum dehydrate for 1.5 hours while stirring.
[0056] Step 2, drop the temperature to 100°C and drop in diphenylmethane diisocyanate, 2 The reaction was stirred at 90°C for 1 hour under protection.
[0057] Step 3: Add additive 3 for enhancing water resistance, bismorpholino diethyl ether, vacuumize and stir at 120° C. for 1 hour, and discharge to obtain hot melt adhesive 3 .
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PUM
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Abstract
The invention discloses a reactive polyurethane hot-melt adhesive, which is composed of the following raw materials in parts by weight: 30-60 parts of polyether polyol, 20-40 parts of polyester polyol, 10-20 parts of polyisocyanate, hydroxyl-terminated acrylate ‑Carbonate copolymer resin 0.5-20 parts, water resistance enhancing additive 0.5-4 parts, catalyst 0.05-0.5 parts. The invention also provides a preparation method of the reactive polyurethane hot-melt adhesive. The reactive polyurethane hot-melt adhesive prepared by the present invention has excellent adhesion to plastics, metals, wood, glass, etc., and has good adhesion to low surface energy materials such as PP and PE, and has good heat resistance. The resistance to water or moisture is particularly superior, and it can be used in fields that require good adhesion to low surface energy materials and may be exposed to heat, water or moisture for a long time. It is suitable for automobile manufacturing, woodworking appliances, construction engineering, Electronic appliances and other fields have broad market prospects.
Description
technical field [0001] The invention belongs to the technical field of reactive polyurethane hot-melt adhesives, in particular, the invention relates to a reactive polyurethane hot-melt adhesive capable of high-strength bonding and water immersion resistance to low-surface-energy plastics and a preparation method thereof. Background technique [0002] Reactive polyurethane hot melt adhesive (PUR) is a reactive adhesive with excellent initial bonding strength, fast fixation, cross-linking and curing, and also has the characteristics of heat resistance, durability, and high final bonding strength. It is developing rapidly and is widely used in construction. , machinery, automobile, electronics and other industries have extremely high application value. [0003] How to improve the bonding of low surface energy plastics in complex environments is a major problem faced by PUR. These environments include: moisture environment, water immersion, long-term external light source expos...
Claims
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Application Information
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