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A high-temperature post-curing polyurethane composite material
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A polyurethane composite material and post-curing technology, applied in the field of polyurethane materials, can solve problems such as poor adhesion performance and surface bubbles, and achieve the effect of improving adhesion performance
Active Publication Date: 2021-08-24
CHANGCHUN A&Z SCI CO LTD
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[0004] The purpose of the present invention is to provide a high-temperature post-curing polyurethane composite material in order to solve the problems of bubbles on the surface and poor bonding performance of the existing polyurethane composition after high-temperature curing
Method used
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[0029] According to the present invention, a method of preparing a modified diatomaceous earth, comprising:
[0030] 1) bis (ethylacetoacetate) aluminum isopropyl methacryloxy propyl trimethoxy silane, γ- and mixed to obtain a mixture; said bis (ethylacetoacetate) aluminum, isobutyl propyl quality and γ- methacryloxypropyl trimethoxy silane is preferably from 3: 7.
[0031] 2) and Celite mixture was stirred at 60-65 deg.] C mixed 40-60min, to obtain a modified diatomaceous earth, diatomaceous earth and the mass ratio of the mixture is preferably 15: 1.
[0032] According to the present invention, a method of preparing a polyurethane prepolymer, comprising:
[0033] Step 1: Reaction the polyether polyol and diisocyanate to obtain a first prepolymer;
[0034] Step two: the first prepolymer and a chain extender, to obtain a second prepolymer;
[0035] Step 3: The second prepolymer and the catalyst are reacted to obtain a polyurethane prepolymer.
[0036] According to the present inve...
Embodiment 1
[0046] Example 1 Preparation of polyurethane prepolymer embodiment
[0047] Under nitrogen atmosphere, 35g polytetramethylene glycol (number average molecular weight 5000 daltons) and toluene diisocyanate 15g2,4- added to the reaction apparatus, was heated to 92 deg.] C, four hours after the polymerization, to obtain a first prepolymer;
[0048] The 3g2,2- dimethylolpropionic acid was added to the first prepolymer at 90 ℃, 2.5 hours, to obtain a second prepolymer;
[0049] 2g of stannous octoate into said second prepolymer at 80 ℃, 2.5 hours, to give a polyurethane prepolymer.
Embodiment 2
[0050] Preparation Example 2 Diatomite Modified
[0051] 0.3g of bis (ethylacetoacetate) aluminum silane, isopropyl myristate and mixing 0.7gγ- methacryloxypropyl trimethoxysilane, to obtain a mixture; 15g diatomaceous earth and the mixture was stirred at 65 deg.] C mixing 50min, to obtain a modified celite.
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Abstract
The invention provides a high-temperature post-curing polyurethane composite material, which belongs to the technical field of polyurethane materials. The combined material includes: 40-60 parts of polyurethane prepolymer, 20-30 parts of modified diatomite, 4-8 parts of water-based polyisocyanate, 3-5 parts of auxiliary agent; the polyurethane prepolymer The polymer is obtained by reacting polyether polyol, diisocyanate, chain extender and catalyst; the modified diatomite is obtained by using two (ethyl acetoacetate) isopropyl aluminate and γ-methyl A mixture of acryloxypropyltrimethoxysilane surface-modified diatomaceous earth. In the present invention, through the combination of polyurethane prepolymer, modified diatomite and water-based polyisocyanic acid, there are no air bubbles on the surface of the obtained composition, and because the modified diatomite can modify the interface between substances, Thereby improving the adhesive performance of polyurethane materials.
Description
Technical field [0001] The present invention belongs to the technical field of polyurethane materials, particularly relates to a high-temperature post-curing polyurethane material. Background technique [0002] Polyurethane material because of its excellent performance has been widely used in transportation, construction, machinery, electronic equipment, furniture, food processing, clothing, textiles, synthetic leather, printing, mining, petrochemical, water, defense, sports, entertainment, medical and other fields. Majority available in the market because of their solvent-based polyurethane disadvantage high volatile solvent content limits its use. And toxic pollution to aqueous polyurethane aqueous dispersion medium, having a low toxicity, non-flammable, and low pollution, energy saving, safety, etc., and also the mechanical properties of polyurethane coatings is good, strong adhesion, abrasion resistance, etc. the aqueous coating characteristics and advantages of the low volat...
Claims
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