阅读说明：本技术 一种聚氨酯防水涂料的制备方法 (Preparation method of polyurethane waterproof coating ) 是由 柴军锋 于 2021-07-23 设计创作，主要内容包括：本发明属于建筑防水技术领域,尤其为一种聚氨酯防水涂料的制备方法,包括以下步骤,将20～25重量份的聚醚多元醇加入到反应釜中,聚醚多元醇包括22～25重量份聚醚二元醇和6～10重量份聚醚三元醇,搅拌20～25分钟后,将反应温度调节至65℃后,迅速加入8～12重量份的多异氰酸酯和0.2～0.8重量份增强剂,在70-80℃条件下保温反应3-4h,在反应釜中依次加入增塑剂、液体填料和扩链剂,分散均匀,搅拌升温到100～120℃,在真空度为-0.08～-0.1MPa的条件下脱水2～3小时,将温度降到70～80℃。该聚氨酯防水涂料的制备方法,不易出现不密实,气泡和针孔等现象,增加涂层的撕裂强度、附着力及防水性,自制潜固化剂味道小,使涂料不易起泡增加人们额施工效率。(The invention belongs to the technical field of building waterproofing, and particularly relates to a preparation method of a polyurethane waterproof coating, which comprises the following steps of adding 20-25 parts by weight of polyether polyol into a reaction kettle, wherein the polyether polyol comprises 22-25 parts by weight of polyether diol and 6-10 parts by weight of polyether triol, stirring for 20-25 minutes, adjusting the reaction temperature to 65 ℃, rapidly adding 8-12 parts by weight of polyisocyanate and 0.2-0.8 part by weight of reinforcing agent, carrying out heat preservation reaction for 3-4 hours at 70-80 ℃, sequentially adding a plasticizer, a liquid filler and a chain extender into the reaction kettle, uniformly dispersing, stirring and heating to 100-120 ℃, dehydrating for 2-3 hours at the vacuum degree of-0.08-0.1 MPa, and reducing the temperature to 70-80 ℃. The preparation method of the polyurethane waterproof coating is not easy to cause phenomena such as incompact, air bubbles and pinholes, increases the tearing strength, adhesive force and waterproofness of the coating, and the self-made latent curing agent has small taste, so that the coating is not easy to foam, and the construction efficiency of people is increased.)

1. A preparation method of a polyurethane waterproof coating comprises the following steps, and is characterized in that: adding 20-25 parts by weight of polyether polyol into a reaction kettle, stirring the polyether polyol comprising 22-25 parts by weight of polyether diol and 6-10 parts by weight of polyether triol for 20-25 minutes, adjusting the reaction temperature to 65 ℃, quickly adding 8-12 parts by weight of polyisocyanate and 0.2-0.8 part by weight of reinforcing agent, carrying out heat preservation reaction for 3-4 hours at 70-80 ℃, sequentially adding plasticizer, liquid filler and chain extender into the reaction kettle, uniformly dispersing, stirring, heating to 100-120 ℃, dehydrating for 2-3 hours under the condition that the vacuum degree is-0.08-0.1 MPa, reducing the temperature to 70-80 ℃, adding diisocyanate, reacting for 2-3 hours at 75-85 ℃, reducing the temperature to 70-80 ℃, adding a self-made latent curing agent, stirring for 30-50 minutes, reducing the temperature to 50-60 ℃, adding catalyst, stirring for 20-30 min, cooling to below 50 deg.C, and introducing nitrogen for protection to obtain polyurethane prepolymer.

2. The preparation method of the polyurethane waterproof coating according to claim 1, characterized in that: the molecular weight of the polyether diol is 2000, the hydroxyl value is 56mgKOH/g, the molecular weight of the polyether triol is 3000, the hydroxyl value is 35mgKOH/g, and the polyether diol and the polyether triol are respectively subjected to drying dehydration treatment before being added.

3. The preparation method of the polyurethane waterproof coating according to claim 1, characterized in that: the plasticizer is one or more of diisononyl phthalate, diisodecyl phthalate, chlorinated paraffin, dioctyl adipate, glycol benzoate, trioctyl phosphate and alkyl phenyl sulfonate; the catalyst is one of triethylene diamine, triethylamine, dimethylethanolamine, dibutyltin diacetate, dibutyltin dilaurate and stannous octoate, and the liquid filler is polyether N-330, polyether N-220, polyether N-3030 and castor oil.

4. The preparation method of the polyurethane waterproof coating according to claim 1, characterized in that: the diisocyanate is one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, naphthalene diisocyanate, xylylene diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate.

5. The preparation method of the polyurethane waterproof coating according to claim 1, characterized in that: the latent curing agent is a self-made latent curing agent, and the self-made latent curing agent consists of the following components in percentage by mass: 60-70% of ketones and 40-30% of amines, and the preparation method of the self-made latent curing agent comprises the following steps: under the protection of nitrogen, adding metered ketones into a closed dispersion kettle, dropwise adding metered amines while stirring, and controlling the temperature below 66 ℃ to react for 18 minutes; then heating to 150 ℃ and refluxing for water diversion; and (4) after no water is separated out completely, vacuumizing to recover redundant ketones, finally cooling to below 50 ℃, and sealing and packaging.

6. The preparation method of the polyurethane waterproof coating according to claim 1, characterized in that: the mass ratio of the polyether diol to the polyether triol to the chain extender to the plasticizer is 1-5: 0.05-1: 0.001-0.1: 1.

Technical Field

The invention relates to the technical field of building waterproofing, in particular to a preparation method of a polyurethane waterproof coating.

Background

The polyurethane waterproof paint is prepared by isocyanate group-containing prepolymer prepared by addition polymerization of isocyanate, polyether and the like, and is matched with a catalyst, an anhydrous auxiliary agent, an anhydrous filler and the like, and the polyurethane waterproof paint is processed by the procedures of mixing and the like, and waterproof construction needs to be carried out on a vertical surface or a slope surface for some large-scale projects, such as south-to-north water transfer, large-scale system stadium basement wall surfaces, high-speed rails, subways, tunnels, civil air guards and the like. At present, the conventional polyurethane coating is a solvent-containing non-environment-friendly coating (because the viscosity of the conventional polyurethane prepolymer is high, a manufacturer must add a filler to reduce the cost to cause the viscosity of the coating to be higher, and if the conventional polyurethane prepolymer is not added with the solvent, the coating is difficult to construct and apply), but due to the introduction of the solvent, the solvent is volatilized during construction, so that on one hand, the taste is high, and on the other hand, air pollution is caused.

However, the existing preparation method for the polyurethane waterproof coating has the following defects:

1. common latent curing agents are deblocked by water vapor in the air, released aldehydes or ketones are heavy in taste, and construction experience of a relatively closed space is influenced;

2. the curing mechanism of the single-component polyurethane waterproof coating is that a prepolymer containing-NCO end groups and moisture in a base layer or air are cured to form a film and CO2 gas is released, so that the cured film is easy to have the phenomena of incompact, bubbles, pinholes and the like, and the normal use of people is influenced.

Disclosure of Invention

In order to solve the problems mentioned in the background art, the present invention provides a method for preparing a polyurethane waterproof coating material, which has the purpose of light taste and less foaming.

In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a polyurethane waterproof coating comprises the following steps of adding 20-25 parts by weight of polyether polyol into a reaction kettle, wherein the polyether polyol comprises 22-25 parts by weight of polyether diol and 6-10 parts by weight of polyether triol, stirring for 20-25 minutes, adjusting the reaction temperature to 65 ℃, rapidly adding 8-12 parts by weight of polyisocyanate and 0.2-0.8 part by weight of reinforcing agent, carrying out heat preservation reaction for 3-4 hours at 70-80 ℃, sequentially adding a plasticizer, a liquid filler and a chain extender into the reaction kettle, dispersing uniformly, stirring, heating to 100-120 ℃, dehydrating for 2-3 hours at the vacuum degree of-0.08-0.1 MPa, reducing the temperature to 70-80 ℃, adding diisocyanate, reacting for 2-3 hours at the stirring state of 75-85 ℃, reducing the temperature to 70-80 ℃, adding a self-made latent curing agent, stirring for 30-50 minutes, cooling to 50-60 ℃, adding a catalyst, stirring for 20-30 minutes, uniformly stirring, cooling to below 50 ℃, and filling nitrogen for protection to obtain the polyurethane prepolymer.

In order to increase the tearing strength of the coating, the molecular weight of the polyether diol is 2000, the hydroxyl value is 56mgKOH/g, the molecular weight of the polyether triol is 3000, the hydroxyl value is 35mgKOH/g, and the polyether diol and the polyether triol are respectively subjected to drying dehydration treatment before being added.

In order to increase the stability of the coating, the plasticizer is one or more of diisononyl phthalate, diisodecyl phthalate, chlorinated paraffin, dioctyl adipate, glycol benzoate, trioctyl phosphate and phenyl alkylsulfonate; the catalyst is one of triethylene diamine, triethylamine, dimethylethanolamine, dibutyltin diacetate, dibutyltin dilaurate and stannous octoate, and the liquid filler is polyether N-330, polyether N-220, polyether N-3030 and castor oil.

In order to ensure that the color of the coating is not changed when in use, the diisocyanate is one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, naphthalene diisocyanate, xylylene diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate.

In order to reduce the taste of the coating, the latent curing agent is a self-made latent curing agent which comprises the following components in percentage by mass: 60-70% of ketones and 40-30% of amines, and the preparation method of the self-made latent curing agent comprises the following steps: under the protection of nitrogen, adding metered ketones into a closed dispersion kettle, dropwise adding metered amines while stirring, and controlling the temperature below 66 ℃ to react for 18 minutes; then heating to 150 ℃ and refluxing for water diversion; and (4) after no water is separated out completely, vacuumizing to recover redundant ketones, finally cooling to below 50 ℃, and sealing and packaging.

In order to prevent the coating from foaming, the feeding mass ratio of the polyether diol, the polyether triol, the chain extender and the plasticizer is 1-5: 0.05-1: 0.001-0.1: 1.

Compared with the prior art, the invention has the beneficial effects that:

1. the prepared coating has better tearing strength, adhesive force and waterproofness, the surface layer of the exposed polyurethane waterproof coating is preferentially contacted with moisture in the air, so that the surface layer can be crosslinked and cured firstly in the film forming process, and CO2 generated by reaction after the moisture enters the inner layer of the film is released quickly, so that the cured film is not easy to have the phenomena of incompact, air bubbles, pinholes and the like, and the tearing strength, the adhesive force and the waterproofness of the coating are improved.

2. The self-made latent curing agent uses low-odor aliphatic ketone and difunctional aliphatic amine as raw materials, so that the viscosity of a synthesized product cannot be influenced when the synthesized product is added into a formula, and the synthesized product can be used as an active diluent when the added amount is large in a metering range. And the hydrolyzed ketones have small taste and good construction experience, and the introduction of the curing agent and the liquid filler prepares the environment-friendly high-performance polyurethane waterproof coating, solves the problem that the solid content of the existing polyurethane waterproof coating is low generally, and is not easy to foam to increase the construction efficiency of people.

In summary, the preparation method of the polyurethane waterproof coating has the aims of light taste and difficult foaming.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides the following technical scheme: a preparation method of a polyurethane waterproof coating comprises the following steps of adding 20-25 parts by weight of polyether polyol into a reaction kettle, wherein the polyether polyol comprises 22-25 parts by weight of polyether diol and 6-10 parts by weight of polyether triol, stirring for 20-25 minutes, adjusting the reaction temperature to 65 ℃, rapidly adding 8-12 parts by weight of polyisocyanate and 0.2-0.8 part by weight of reinforcing agent, carrying out heat preservation reaction for 3-4 hours at 70-80 ℃, sequentially adding a plasticizer, a liquid filler and a chain extender into the reaction kettle, dispersing uniformly, stirring, heating to 100-120 ℃, dehydrating for 2-3 hours under the condition that the vacuum degree is-0.08-0.1 MPa, reducing the temperature to 70-80 ℃, adding diisocyanate, reacting for 2-3 hours under the stirring state at 75-85 ℃, reducing the temperature to 70-80 ℃, adding a self-made curing agent, stirring for 30-50 minutes, cooling to 50-60 ℃, adding a catalyst, stirring for 20-30 minutes, uniformly stirring, cooling to below 50 ℃, and introducing nitrogen for protection to obtain the polyurethane prepolymer.

In this embodiment: the self-made latent curing agent uses low-odor aliphatic ketone and difunctional aliphatic amine as raw materials, so that the viscosity of a synthesized product cannot be influenced when the synthesized product is added into a formula, the added amount of the self-made latent curing agent in a metering range can also be used as an active diluent, the ketone taste is small after hydrolysis, good construction experience is achieved, the curing agent and liquid filler are introduced, the environment-friendly high-performance polyurethane waterproof coating is prepared, the problem that the solid content of the existing polyurethane waterproof coating is low generally is solved, foaming is not easy to occur, the construction efficiency of people is increased, the tearing strength, the adhesive force and the waterproofness of a coating are improved, the low-odor aliphatic ketone and the difunctional aliphatic amine are used as raw materials in the self-made latent curing agent, the viscosity of the synthesized product cannot be influenced when the synthesized product is added into the formula, and the added amount of the self-made latent curing agent in the metering range can also be used as the active diluent. And the hydrolyzed ketones have small taste and good construction experience, and the introduction of the curing agent and the liquid filler prepares the environment-friendly high-performance polyurethane waterproof coating, solves the problem that the solid content of the existing polyurethane waterproof coating is low generally, and is not easy to foam to increase the construction efficiency of people.

As a technical optimization scheme of the invention, the molecular weight of the polyether diol is 2000, the hydroxyl value is 56mgKOH/g, the molecular weight of the polyether triol is 3000, the hydroxyl value is 35mgKOH/g, and the polyether diol and the polyether triol are respectively subjected to drying and dehydration treatment before being added.

In this embodiment: polyether polyol (polyether for short) is prepared by the polyaddition reaction of an initiator (a compound containing an active hydrogen group) and Ethylene Oxide (EO), Propylene Oxide (PO), Butylene Oxide (BO) and the like in the presence of a catalyst, and is a chemical product and is commonly used for preparing general polyurethane foam plastics, adhesives, elastomers and the like.

As a technical optimization scheme of the invention, the plasticizer is one or a combination of more of diisononyl phthalate, diisodecyl phthalate, chlorinated paraffin, dioctyl adipate, glycol benzoate, trioctyl phosphate and phenyl alkylsulfonate; the catalyst is one of triethylene diamine, triethylamine, dimethylethanolamine, dibutyltin diacetate, dibutyltin dilaurate and stannous octoate, and the liquid filler is polyether N-330, polyether N-220, polyether N-3030 and castor oil.

In this embodiment: plasticizers, catalysts and liquid fillers can increase the stability of the coating.

As a technical optimization scheme of the invention, the diisocyanate is one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, naphthalene diisocyanate, xylylene diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate.

In this embodiment: the diisocyanate is one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, naphthalene diisocyanate, xylylene diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate, and the color of the coating is ensured to be unchanged when the coating is used.

As a technical optimization scheme of the invention, the latent curing agent is a self-made latent curing agent which comprises the following components in percentage by mass: 60-70% of ketones and 40-30% of amines, and the preparation method of the self-made latent curing agent comprises the following steps: under the protection of nitrogen, adding metered ketones into a closed dispersion kettle, dropwise adding metered amines while stirring, and controlling the temperature below 66 ℃ to react for 18 minutes; then heating to 150 ℃ and refluxing for water diversion; and (4) after no water is separated out completely, vacuumizing to recover redundant ketones, finally cooling to below 50 ℃, and sealing and packaging.

In this embodiment: the self-made latent curing agent can reduce the taste of the coating and ensure the safety of constructors.

As a technical optimization scheme of the invention, the feeding mass ratio of the polyether diol, the polyether triol, the chain extender and the plasticizer is 1-5: 0.05-1: 0.001-0.1: 1.

In this embodiment: the polyether diol, the polyether triol, the chain extender and the plasticizer are uniformly mixed according to the mass ratio of 1-5: 0.05-1: 0.001-0.1: 1, so that the coating can be prevented from foaming, and the construction efficiency of people is improved.

The working principle and the using process of the invention are as follows: the self-made latent curing agent uses low-odor aliphatic ketone and difunctional aliphatic amine as raw materials, so that the viscosity of a synthesized product cannot be influenced when the synthesized product is added into a formula, and the synthesized product can be used as an active diluent when the added amount is large in a metering range. And the ketones after hydrolysis have small taste and good construction experience, the environment-friendly high-performance polyurethane waterproof coating is prepared by introducing the curing agent and the liquid filler, and the low-odor aliphatic ketone and the difunctional aliphatic amine are used as raw materials in the self-made latent curing agent, so that the viscosity of the product cannot be influenced when the synthesized product is added into the formula, and the product can be used as an active diluent when the added amount is large in a metering range. And the hydrolyzed ketones have small taste and good construction experience, and the environment-friendly high-performance polyurethane waterproof coating is prepared by introducing the curing agent and the liquid filler.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.