Polylactic acid scarf polyurethane environment-friendly waterproof coating and preparation process thereof

A waterproof coating and polylactic acid technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of reducing the degree of polymerization and physical strength of polylactic acid, poor mechanical properties, environmental pollution, etc., and achieve improved biodegradability and compatibility Capacitance, strengthen the skeleton strength, improve the effect of hydrophobicity

CN108531067AActive Publication Date: 2018-09-14安徽朗凯奇科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-09-14

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Abstract

The invention discloses a polylactic acid scarf polyurethane environment-friendly waterproof coating and a preparation process thereof. The waterproof coating comprises, by weight, 100 parts of polytetramethylene ether glycol, 25-45 parts of isophorone diisocyanate, 30-50 parts of hydroxyl-terminated polylactide, 7-15 parts of nano-scale oxidized graphene, 0.15-0.3 part of dibenzoyl peroxide, 4-8parts of tetrahydrofuran, 2-6 parts of chain extenders, 16-20 parts of acetone, 4-10 parts of triethylamine, 0.02-0.5 part of catalysts, 2-4 parts of defoaming agents, 1-3 leveling agents, 9-15 partsof deionized water and 40-60 parts of inorganic fillers. Graphene grafted polylactic acid copolymers are embedded into a polyurethane main chain, active groups such as ester bonds and carboxyl are introduced, the biological degradability and compatibility of the polyurethane coating are improved, and a degradation product is poisonless, harmless, green and environmentally friendly.
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Description

technical field

[0001] The invention relates to the technical field of polyurethane waterproof coatings, in particular to a polyurethane environment-friendly waterproof coating embedded with polylactic acid and a preparation process thereof. Background technique

[0002] Polyurethane waterproof coating is an organic polymer material formed by the addition and polymerization of isocyanate and polyether. It has the advantages of high physical strength, high elongation, high flexibility, and good water resistance. It is widely used in construction projects, underground projects, Water resistance and anti-seepage of roofing engineering and other fields, but after the polyurethane coating is separated from the base surface, it will pollute the environment because it is difficult to degrade and recycle. Therefore, how to produce an environmentally friendly green polyurethane waterproof coating is currently in demand. solved problem.

[0003] The patent application number is CN201...

Examples

Embodiment 1

[0022] A polylactic acid embedded polyurethane environment-friendly waterproof coating comprises the following components in parts by weight:

[0023]

[0024]

[0025] The present invention also provides a preparation process of the above-mentioned polylactic acid embedding polyurethane environment-friendly waterproof coating, comprising the following steps:

[0026] S1: Dissolve hydroxyl-terminated polylactic acid with a molecular weight of 500 in tetrahydrofuran, then heat to 100°C, introduce nano-scale graphene oxide and dibenzoyl peroxide, and stir for 30 hours under the protection of an inert gas to obtain a graphene graft. Dendritic polylactic acid;

[0027] S2: In a vacuum environment at 100°C, dehydrate and dry polytetramethylene ether glycol. When the water content drops to 60%, add isophorone diisocyanate and catalyst, and in an inert gas environment at 65°C and 0.1MPa In, carry out nucleophilic addition reaction, obtain polyurethane prepolymer;

[0028] S3:...

Embodiment 2

[0031] A polylactic acid embedded polyurethane environment-friendly waterproof coating comprises the following components in parts by weight:

[0032]

[0033]

[0034] The preparation method of above-mentioned waterproof paint is with embodiment 1, difference is:

[0035] S1: The molecular weight of hydroxyl-terminated polylactic acid is 1500, and the stirring reaction temperature and time are 120°C and 45h, respectively;

[0036] S2: The dehydration temperature is 110°C, and the nucleophilic addition reaction temperature is 70°C;

[0037] S3: heat preservation and stirring reaction time is 2h;

[0038] S4: The stirring speed is 4000 rpm.

Embodiment 3

[0040] A polylactic acid embedded polyurethane environment-friendly waterproof coating comprises the following components in parts by weight:

[0041]

[0042]

[0043] The preparation method of above-mentioned waterproof paint is with embodiment 1, difference is:

[0044] S1: The molecular weight of hydroxyl-terminated polylactic acid is 2500, and the stirring reaction temperature and time are 140°C and 60h, respectively;

[0045] S2: The dehydration temperature is 120°C, and the nucleophilic addition reaction temperature is 75°C;

[0046] S3: heat preservation and stirring reaction time is 3h;

[0047] S4: The stirring speed is 5000 rpm.