High-transparency and high-fire-resistance intumescent wood structure fireproof coating and preparation method thereof

Abstract

The invention provides a high-permeability and high-fire-resistance intumescent wood structure fireproof coating which comprises a component A and a component B. The component A comprises the following components in percentage by mass: 35%-45% of amino resin, 2%-6% of an activating agent, 30%-35% of deionized water, 0.1%-0.15% of a sterilizing agent, 0.1%-0.5% of a defoaming agent, 0.05%-0.2% of a PH regulator, 0.1%-0.5% of a base material wetting agent and 0.3%-0.8% of a cross-linking agent; and the component B comprises 20% of a flame retardant. The dry and wet film is high in transparency, and the existence of film fog shadow after painting is effectively reduced. Therefore, the invention has the advantages of high transparency, easy construction, fire resistance, weather resistance and good expansibility.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fireproof coating, in particular to a high-transparency and high-fire-resistance intumescent wood structure fireproof coating and a preparation method thereof. BACKGROUND

[0002] The fire-retardant coating can effectively reduce the flammability of the coating substrate, prevent the rapid spread of fire, or improve the fire resistance limit of the coating substrate, thereby gaining valuable time for personnel to escape.

[0003] When burning, the intumescent fireproof coating forms a porous foam carbon layer on the surface of the substrate, which insulates oxygen and high temperature, thereby achieving fire-retardant and heat-insulating effects. The intumescent fireproof coating has high expansion ratio and excellent fire-retardant and heat-insulating performance, and is widely used in wood structure buildings, wooden furniture and the like.

[0004] At present, the transparent intumescent wood structure fireproof coating produced by domestic fireproof coating factories is composed of epoxy resin, flame retardant, carbon forming agent and foaming agent. The existing wood structure fireproof coating has the following disadvantages when in use:

[0005] 1. poor transparency; 2. weak fire-retardant and heat-insulating effect; 3. low expansion ratio; 4. high viscosity of the coating itself, which is difficult to dilute (water cannot be used), resulting in uneven coating film and poor decorative effect after drying; 5. poor weather resistance, and the coating film is prone to discoloration over time. Therefore, the existing technology has certain limitations. SUMMARY

[0006] The present application is to solve the above problems, and aims to provide a high-transparency and high-fire-resistance intumescent wood structure fireproof coating and a preparation method thereof.

[0007] The present application provides a high-transparency and high-fire-resistance intumescent wood structure fireproof coating, which has the following characteristics: comprising component A and component B, and the content of each component is as follows in terms of mass percentage:

[0008] The component A comprises 35-45% of amino resin, 2-6% of activator, 30-35% of deionized water, 0.1-0.15% of bactericide, 0.1-0.5% of defoaming agent, 0.05-0.2% of PH regulator, 0.1-0.5% of substrate wetting agent and 0.3-0.8% of crosslinking agent;

[0009] The component B comprises 20% of flame retardant.

[0010] The amino resin is water-soluble lowly methylated high imino melamine resin, and the flame retardant is a mixture of polyphosphoric acid, pentaerythritol and ethylene glycol.

[0011] In the high-transparency high-fireproofness intumescent wood structure fireproof coating and the preparation method thereof, the activating agent can be propylene glycol.

[0012] In the high-transparency high-fireproofness intumescent wood structure fireproof coating and the preparation method thereof, the defoaming agent can be a polyether siloxane copolymer.

[0013] In the high-transparency high-fireproofness intumescent wood structure fireproof coating and the preparation method thereof, the PH regulator can be N,N-dimethylethanolamine.

[0014] In the high-transparency high-fireproofness intumescent wood structure fireproof coating and the preparation method thereof, the base material wetting agent can be a polyether organic silicon base material wetting agent.

[0015] In the high-transparency high-fireproofness intumescent wood structure fireproof coating and the preparation method thereof, the crosslinking agent can be a carbodiimide.

[0016] The application further provides a preparation method of the high-transparency high-fireproofness intumescent wood structure fireproof coating, which is suitable for any one of the high-transparency high-fireproofness intumescent wood structure fireproof coatings and has the following characteristics.

[0017] Preparation of component A:

[0018] S1, first, the deionized water, the bactericide, the defoaming agent, the activating agent and the amino resin are sequentially placed in a stirring kettle and stirred for 5-10 minutes until uniform;

[0019] S2, the PH regulator, the base material wetting agent and the crosslinking agent are placed in the stirring kettle and stirred for 10-20 minutes until uniform;

[0020] S3, the stirring product is filtered by using a 200-mesh filter screen to obtain component A;

[0021] Preparation of component B:

[0022] S1, the fire retardant is divided into components to obtain component B.

[0023] Effects of the application

[0024] The high-transparency high-fireproof intumescent wood structure fireproof coating relates to the present application, which uses melamine contained in amino resin as the intumescent agent, greatly improves the intumescent ratio of the coating after being exposed to fire, and effectively blocks heat transfer while ensuring the transparency of the material. Component A can be diluted with water while ensuring the adhesion of the coating film, greatly reducing the difficulty of construction and forming a transparent and smooth coating film. The fire retardant in component B is a transparent liquid with high transparency and excellent fire retardant effect, which makes the dry and wet coating film of the present application have high transparency and effectively reduces the existence of coating film haze after brushing. Therefore, the present application has the advantages of high transparency, easy construction, fire resistance, weather resistance, and good intumescent property. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following examples will be described in detail.

[0026] EMBODIMENT

[0027] The present embodiment provides a high-transparency high-fireproof intumescent wood structure fireproof coating, which comprises component A and component B, and the content of each component is as follows:

[0028] Component A comprises 35% to 45% of amino resin, 2% to 6% of activator, 30% to 35% of deionized water, 0.1 to 0.15% of bactericide, 0.1 to 0.5% of defoaming agent, 0.05 to 0.2% of PH regulator, 0.1 to 0.5% of base material wetting agent, and 0.3 to 0.8% of crosslinking agent.

[0029] Component B comprises 20% of fire retardant.

[0030] In the present embodiment, the amino resin is preferably water-soluble lowly methylated high imino melamine resin, which can be infinitely diluted and does not burn, and the contained melamine releases fire-retardant gas at high temperature, effectively expanding the coating film. The fire retardant is preferably a mixture of polyphosphoric acid, pentaerythritol and ethylene glycol.

[0031] In the present embodiment, the activator is preferably propylene glycol, which can extend the activation period of the fireproof coating of the present application from 25 minutes to 60 minutes by adjusting the content.

[0032] In the present embodiment, the defoaming agent is preferably polyether siloxane copolymer, which can eliminate foam without causing oil shrinkage and pinholes.

[0033] In the present embodiment, the PH regulator is preferably N,N-dimethyl ethanolamine (DMEA), which is used to adjust the PH value of the fireproof coating of the present application.

[0034] In the embodiment, the substrate wetting agent is preferably a polyether organosilicon substrate wetting agent. The surface tension of the fireproof coating of the present application can be effectively reduced, so that the fireproof coating of the present application can penetrate into the substrate during application, thereby improving the workability of the fireproof coating of the present application.

[0035] In the embodiment, the crosslinking agent is preferably a carbodiimide. The carboxyl component can be crosslinked, thereby improving the water resistance and adhesion of the film formed by the fireproof coating of the present application.

[0036] In the embodiment, the bactericide is preferably a canthaxanthin in-can preservative.

[0037] In summary, the high-transmittance high-fire-resistant intumescent wood structure fireproof coating provided in the embodiment comprises: component A and component B, and the component A preferably comprises, in terms of mass percentage: 32.2% of deionized water, 0.05% of K9N bactericide produced by Tenoil, 6% of an activator (propylene glycol), 0.4% of TG810 defoaming agent produced by Digo Chemical, 40% of CYMEL385 amino resin produced by Cyanite, 0.4% of 4748A substrate wetting agent produced by Wanhua Chemical, 0.08% of HG120 carbodiimide produced by Hanjian New Material, and 0.15% of PH regulator (dimethyl ethanolamine) produced by Gutian Chemical. The component B preferably comprises 20% of Exolit855 flame retardant produced by Clariant.

[0038] The embodiment also provides a preparation method of the high-transmittance high-fire-resistant intumescent wood structure fireproof coating, which is suitable for any one of the high-transmittance high-fire-resistant intumescent wood structure fireproof coatings and comprises the following steps:

[0039] Preparation of component A:

[0040] S1, first, the deionized water, the bactericide, the defoaming agent, the activator, and the amino resin are sequentially placed in a stirring kettle, and stirred for 5-10 minutes until uniform;

[0041] S2, the PH regulator, the substrate wetting agent, and the crosslinking agent are placed in the stirring kettle, and stirred for 10-20 minutes until uniform;

[0042] S3, the stirring product is filtered using a 200-mesh filter screen to obtain the component A;

[0043] Preparation of component B:

[0044] S1, the flame retardant is divided into portions to obtain the component B.

[0045] The embodiment also provides a construction method of the high-transmittance high-fire-resistant intumescent wood structure fireproof coating, which is suitable for any one of the high-transmittance high-fire-resistant intumescent wood structure fireproof coatings and comprises the following steps:

[0046] Step one, mix component A and component B evenly in the ratio of 4:1;

[0047] Step two, evenly brush or spray the mixed fireproof coating on the cleaned wood structure within 2 hours, and then dry at room temperature for 4-6 hours;

[0048] Step three, repeat the operation of step two until at least three layers of the fireproof coating of the present application are coated on the wood structure.

[0049] The fireproof coating according to the present application, combined with the construction method provided by the present application, the first layer of the fireproof coating of the present application coated on the wood structure can achieve the effect of long-term fire retardant of the wood structure, and the second layer, the third layer and the like of the fireproof coating of the present application coated on the wood structure can make the coating expand 60-70 times at high temperature, thereby achieving the effect of heat insulation on the basis of fire retardant.

[0050] Effects of the embodiment

[0051] The high-transparency, high-fire-resistance intumescent wood structure fireproof coating according to the present application greatly improves the expansion ratio of the coating after fire in the case of ensuring the transparency of the material, effectively blocks the heat transfer, and greatly reduces the construction difficulty and forms a transparent and smooth coating film under the condition of ensuring the adhesion of the coating film by using water to dilute component A. The fire retardant in component B is a transparent liquid with high transparency and excellent fire retardant effect, so that the dry and wet film of the present application has high transparency, effectively reducing the existence of coating film haze after brushing. Therefore, the present application has the advantages of high transparency, easy construction, fire resistance, weather resistance and good expansibility.

[0052] The above embodiment is a preferred case of the present application and does not limit the protection scope of the present application.

Claims

1. A fire retardant coating, characterized in that: include: Component A and component B, calculated by mass percentage, The component A comprises 35% to 45% of amino resin, 2% to 6% of activator, 30% to 35% of deionized water, 0.1 to 0.15% of bactericide, 0.1 to 0.5% of defoamer, 0.05 to 0.2% of pH regulator, 0.1 to 0.5% of substrate wetting agent, and 0.3 to 0.8% of cross-linking agent; The component B includes 20% of a flame retardant; The amino resin is a water-soluble low-methyl etherified high-imino melamine resin, and the flame retardant is a mixture of polyphosphoric acid, pentaerythritol and ethylene glycol.

2. The fire retardant coating according to claim 1, characterized in that: in, The activator is propylene glycol.

3. The fire retardant coating according to claim 1, characterized in that: in, The defoaming agent is a polyether siloxane copolymer.

4. The fire retardant coating according to claim 1, characterized in that: in, The pH regulator is N,N-dimethylethanolamine.

5. The fire retardant coating according to claim 1, characterized in that: in, The substrate wetting agent is a polyether silicone substrate wetting agent.

6. The fire retardant coating according to claim 1, characterized in that: in, The cross-linking agent is carbodiimide.

7. A method for preparing a fire retardant coating, applicable to the fire retardant coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: Preparation of component A: S1. First, the deionized water, the bactericide, the defoamer, the activator, and the amino resin are placed in a stirring tank in order, and stirred for 5 to 10 minutes until uniform; S2, placing the pH regulator, the substrate wetting agent, and the cross-linking agent into the stirring tank, and stirring for 10 to 20 minutes until uniform; S3, filtering the stirred product using a 200-mesh filter to obtain component A; Preparation of component B: S1. Packing the flame retardant into subpackages to obtain component B.