Solvent-free single-component polyurethane waterproof coating and preparation method thereof

A polyurethane waterproof, one-component technology, applied in the field of coatings, can solve problems such as poor sag resistance at high temperature, and achieve the effects of strong adhesion, improved sag resistance and bond strength, and good sag resistance.

Active Publication Date: 2022-05-06

HEBEI YUYANGZELI WATERPROOF MATERIAL

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AI-Extracted Technical Summary

Problems solved by technology

[0006] The present invention proposes a solvent-free one-component polyurethane waterproof coating and its preparation method, ...

Abstract

The invention relates to the technical field of coatings, and provides a solvent-free single-component polyurethane waterproof coating which comprises the following components in parts by weight: 20-30 parts of polyether glycol, 3-10 parts of polyether triol, 5-10 parts of liquefied MDI, 30-55 parts of talcum powder, 5-10 parts of a latent curing agent, 15-30 parts of a low-viscosity plasticizer and 3-10 parts of a rheological additive. The high-temperature-resistant water-based paint comprises the following components in parts by weight: 0.1-0.5 part of fluorine-containing polymer micro powder, 0.1-0.5 part of zirconium phosphate, 0.05-2 parts of a catalyst and 0.2-1 part According to the technical scheme, the problem of poor high-temperature sagging resistance of the polyurethane waterproof coating in the prior art is solved.

Application Domain

Fireproof paintsPolyurea/polyurethane coatings

Technology Topic

PlasticizerFirming agent +12

Examples

Experimental program(7)

Example Embodiment

[0028] Example 1

[0029] Preparation: 20 parts of polyether diols, 3 parts of polyether triols, 5 parts of carbodiimide modified MDI, 30 parts of talc powder, 5 parts of imine latent curing agent, 15 parts of low viscosity plasticizer, 3 parts of rheological additives, 0.1 parts of FEP micro powder, modified α- Zirconium phosphate 0.1 phr, catalyst 0.05 phr, additive Ti dehydrator 0.2 phr;

[0030] The rheological aids are a mixture of basic calcium sulfonate gel, PVC paste resin and sodium fluorozirconate, with a mass ratio of 5:3:1.

[0031] The low viscosity plasticizer is a mixture of bis (2-ethylhexyl) cyclohexane-1,2-dicarboxylic acid and bis (2-propylheptyl) phthalate (DPHP), with a mass ratio of 1:1.

[0032] The molecular weight of polyether diol is 2000 and that of polyether triol is 4800.

[0033] Preparation method:

[0034] S1. Shear one-third of the low viscosity plasticizer with rheological additives, add dehydrating agent and stir for standby;

[0035] S2. Cool the remaining low viscosity plasticizer, polyether diol, polyether triol and talc powder to 50 ℃ after vacuuming at 100 ℃, add carbodiimide modified MDI, raise the temperature to 80 ± 2 ℃, react for 2h, lower the temperature to 50 ℃, and add other raw materials to stir.

[0036] Construction condition: after 60 ℃ base surface is sprayed, the thick coating is 2.5mm without flowing.

[0037] Tested according to GB / T 19250-2003 polyurethane waterproof coating: tear strength 18N / mm, wet base bonding strength 1.0MPa.

Example Embodiment

[0038] Example 2

[0039] Preparation: 30 parts of polyether diols, 10 parts of polyether triols, 10 parts of carbodiimide modified MDI, 55 parts of talc powder, 10 parts of imine latent curing agent, 30 parts of low viscosity plasticizer, 10 parts of rheological additives, 0.5 parts of FEP powder, modified α- Zirconium phosphate 0.5 parts, catalyst 2 parts, additive of dehydrator 1 part;

[0040] The rheological additives are the mixture of active nano kaolin, PVC paste resin and modified urea, and the mass ratio of the three is 5:2:1.

[0041] The low viscosity plasticizer is a mixture of chlorinated palm oil methyl ester and alkylbenzene sulfonate, and the mass ratio of the two is 1:1.

[0042] The molecular weight of polyether diol is 2000 and that of polyether triol is 4800.

[0043] Preparation method:

[0044] S1. Shear one-third of the low viscosity plasticizer with rheological additives, add dehydrating agent and stir for standby;

[0045] S2. Cool the remaining low viscosity plasticizer, polyether diol, polyether triol and talc powder to 60 ℃ after vacuum pumping at 120 ℃, add carbodiimide modified MDI, raise the temperature to 80 ± 2 ℃, react for 2h, lower the temperature to 60 ℃, and add other raw materials for stirring.

[0046] Construction condition: after 60 ℃ base surface is sprayed, the thick coating is 2.5mm without flowing.

[0047] Tested according to GB / T 19250-2003 polyurethane waterproof coating: tear strength 20n / mm, wet base bonding strength 0.9mpa.

Example Embodiment

[0048] Example 3

[0049] Preparation: 25 parts of polyether diols, 6 parts of polyether triols, 8 parts of carbodiimide modified MDI, 40 parts of talc powder, 8 parts of imine latent curing agent, 20 parts of low viscosity plasticizer, 5 parts of rheological additives, 0.3 parts of PTFE micro powder, modified α- Zirconium phosphate 0.3 phr, catalyst 1 phr, additive Ti dehydrator 0.6 phr;

[0050] The rheological aids are a mixture of basic calcium sulfonate gel, PVC paste resin and sodium fluorozirconate, with a mass ratio of 6:3:1.

[0051] The low viscosity plasticizer is a mixture of bis (2-ethylhexyl) cyclohexane-1,2-dicarboxylic acid and bis (2-propylheptyl) phthalate (DPHP), with a mass ratio of 1:1.

[0052] The molecular weight of polyether diol is 2000 and that of polyether triol is 4800.

[0053] Preparation method:

[0054] S1. Shear one-third of the low viscosity plasticizer with rheological additives, add dehydrating agent and stir for standby;

[0055] S2. The residual low viscosity plasticizer, polyether diol, polyether triol and talc powder are cooled to 55 ℃ after vacuuming at 110 ℃, and then added with carbodiimide modified MDI to raise the temperature to 80 ± 2 ℃ for 2 hours, then cooled to 55 ℃ after reaction, and then mixed with other raw materials.

[0056] Construction condition: after 60 ℃ base surface is sprayed, the thick coating is 2.5mm without flowing.

[0057] Tested according to GB / T 19250-2003 polyurethane waterproof coating: tear strength 20n / mm, wet base bonding strength 1.1MPa.

PUM

Property	Measurement	Unit
Tear strength	18.0	N/mm
Bond strength	1.0	mPa
Tear strength	20.0	N/mm

Description & Claims & Application Information

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Solvent-free single-component polyurethane waterproof coating and preparation method thereof

A polyurethane waterproof, one-component technology, applied in the field of coatings, can solve problems such as poor sag resistance at high temperature, and achieve the effects of strong adhesion, improved sag resistance and bond strength, and good sag resistance.

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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