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Preparation method for polyurethane adhesive
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A polyurethane adhesive and polyurethane resin technology, applied in the field of polyurethane, can solve the problems of long curing time, low toughness, poor stability, etc., and achieve the effect of short curing time, high adhesive strength and good stability
Inactive Publication Date: 2018-09-07
耿佃勇
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Problems solved by technology
However, the curing time of conventional adhesives is long, the bonding strength is poor, the toughness is low, the fluidity after melting is not good, and the stability is poor
Some polyurethane adhesives need to be modified, which increases the cost of the adhesive
Method used
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Embodiment 1
[0016] A preparation method of polyurethane adhesive, comprising the following steps:
[0017] (1) Put 50 parts by mass of polyether polyol A, 50 parts by mass of polyether polyol B, 10 parts by mass of polyetheramine T-500, 10 parts by mass of polyurethane resin, and 3 parts of eugenol in an airtight container, start stirring, Nitrogen replacement; heating up to 130°C, vacuuming, and nitrogen bubbling for 2 hours; the polyether polyol A has a functionality of 5, and the hydroxyl value is 230 mgKOH / g, and the polyether polyol B has a functionality of 3, and the hydroxyl The value is 150 mgKOH / g.
[0018] (2) Add 20 parts by mass of isocyanate MDI-50 and react at 60°C for 2 hours to obtain a polyurethane adhesive.
Embodiment 2
[0020] A preparation method of polyurethane adhesive, comprising the following steps:
[0021] (1) Put 15 parts by mass of polyether polyol A, 50 parts by mass of polyether polyol B, 3 parts by mass of polyetheramine T-500, 12 parts by mass of polyurethane resin, and 4 parts by mass of eugenol in an airtight container, start stirring, Nitrogen replacement; heating up to 130°C, vacuuming, and nitrogen bubbling for 2 hours; the polyether polyol A has a functionality of 5, and the hydroxyl value is 230 mgKOH / g, and the polyether polyol B has a functionality of 3, and the hydroxyl The value is 150 mgKOH / g.
[0022] (2) Add 25 parts by mass of isocyanate MDI-50 and react at 65°C for 2 hours to obtain a polyurethane adhesive.
Embodiment 3
[0024] A preparation method of polyurethane adhesive, comprising the following steps:
[0025] (1) Put 50 parts by mass of polyether polyol A, 25 parts by mass of polyether polyol B, 15 parts by mass of polyetheramine T-500, 11 parts by mass of polyurethane resin, and 5 parts by mass of eugenol in an airtight container, start stirring, Nitrogen replacement; heating up to 130°C, vacuuming, and nitrogen bubbling for 2 hours; the polyether polyol A has a functionality of 5, and the hydroxyl value is 230 mgKOH / g, and the polyether polyol B has a functionality of 3, and the hydroxyl The value is 150 mgKOH / g.
[0026] (2) Add 20 parts by mass of isocyanate MDI-50 and react at 65°C for 2 hours to obtain a polyurethane adhesive.
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Abstract
The invention specifically relates to a preparation method for a polyurethaneadhesive, belonging to the technical field of polyurethane. The preparation method comprises the following steps: putting10 to 50 parts by mass of the polyether polyol A, 10 to 50 parts by mass of the polyether polyol B, 3 to 20 parts by mass of amino-terminated polyether, 10 to 12 parts by mass of polyurethane resin and 3 to 5 parts of eugenol into a closed container, starting stirring and carrying out nitrogen displacement; carrying out heating to 130 DEG C, then carrying out vacuumizing, and carrying out nitrogenbubbling for 2 hours; and adding 20 to 25 parts by mass of isocyanate and carrying out a reaction at 60 to 65 DEG C for 2 hours so as to obtain the polyurethane adhesive. The preparation method of the invention has low cost; and the prepared adhesive is short in curing time, high in adhesive strength and good in stability.
Description
technical field [0001] The invention belongs to the technical field of polyurethane, and in particular relates to a preparation method of polyurethane adhesive. Background technique [0002] Polyurethane adhesives refer to adhesives that contain urethane groups or isocyanate groups in the molecular chain. Polyurethane adhesives are divided into two categories: polyisocyanate and polyurethane. The molecular chain of polyisocyanate contains isocyanate group and carbamate group, so the polyurethane adhesive shows a high degree of activity and polarity. However, the curing time of conventional adhesives is long, the bonding strength is poor, the toughness is low, the fluidity after melting is not good, and the stability is poor. Some polyurethane adhesives need to be modified, which increases the cost of the adhesive. Contents of the invention [0003] The object of the present invention is to provide a low-cost polyurethane adhesive preparation method, the prepared adhesiv...
Claims
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Application Information
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