Halogenn-free flame retardant polyurethane sealant and preparation method thereof

A polyurethane sealant and sealant technology, applied in the field of sealant, can solve the problems of red phosphorus explosion, easy precipitation, and low flame retardant efficiency of flame retardants

Active Publication Date: 2014-10-15
广东国望精细化学品有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flame retardant efficiency of inorganic hydroxide flame retardants is low, and a large amount of addition is required to achieve the purpose of flame retardancy, which has a great impact on product performance; the problem of moisture absorption of red phosphorus flame retardants has a great impact on the final performance of the colloid. At the same time, there is a risk of explosion of red phosphorus when processing glue in a vacuum airtight environment; the types of polyphosphates include melamine polyphosphate, melamine pyrophosphate, etc. These flame retardants have low flame retardant efficiency in practical applications, and there are easy-to-dissolve problems
Although halogenated flame retardants have the characteristics of high flame retardant efficiency, due to the release of a large amount of toxic gases when they burn, there is a tendency to gradually limit their application in recent years.

Method used

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  • Halogenn-free flame retardant polyurethane sealant and preparation method thereof
  • Halogenn-free flame retardant polyurethane sealant and preparation method thereof
  • Halogenn-free flame retardant polyurethane sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Mix 1000g of PPG with a molecular weight of 2000 and 200g of polyoxyglycerol with a molecular weight of 5000, remove water under low vacuum at 120°C for 1 hour, cool down to 45°C, add 330g of crude MDI and 0.007% of the above mixture by weight Stannous octoate was reacted for 4 hours, and after the residual isocyanate content reached the theoretical value, the temperature was lowered to obtain a polyurethane prepolymer.

[0030] (2) Prepare raw materials according to the following formula

[0031]

[0032]

[0033] (3) According to the above formula, mix 200g of polyurethane prepolymer with 50g of BDP, 50g of TRIMER, 30g of hydrotalcite, 30g of PER, 30g of ethylene glycol, 150g of 10μm light calcium calcium, 20g of hydrogenated castor oil, 24g of UV6224g, antioxidant Add 10101g of agent, 240g of carbon black and 180g of chlorinated paraffin oil into a double planetary mixer with a high-speed dispersing head, stir and mix it at 45°C and a low vacuum of less tha...

Embodiment example 2

[0035] (1) Mix 1000g of PPG with a molecular weight of 3000 and 300g of polyoxyglycerol with a molecular weight of 5000, remove water under low vacuum at 140°C for 1 hour, cool down to 45°C, add 200g of TDI and 0.0001% of the above mixture by weight of dilaurel Dibutyltin acid, reacted for 3 hours, and after the residual isocyanate content reached the theoretical value, the temperature was lowered to obtain a polyurethane prepolymer.

[0036] (2) Prepare raw materials according to the following formula

[0037]

[0038]

[0039](3) According to the above formula, mix 220g of polyurethane prepolymer with 20g of MEL, 40g of APP, 20g of zinc borate, 110g of ultrafine pentaerythritol, 160g of 10μm heavy calcium, 30g of hydrogenated castor oil, UV3274g, antioxidant 10761g, Add 220g of carbon black and DOP170g into a double planetary mixer with a high-speed dispersing head, stir and mix it at 35°C and a low vacuum of less than 2kpa for 2h, and then add PTSI8g and BDMAEE0. 02g...

Embodiment example 3

[0041] (1) Mix 800g of PPG with a molecular weight of 2000 and 250g of polyoxyglycerol with a molecular weight of 6000, remove water under low vacuum at 120°C for 1 hour, cool down to 55°C, add 180g of MDI and 0.005% of the above mixture by weight. tin, react for 5 hours, and after the residual isocyanate content reaches the theoretical value, the temperature is lowered to obtain a polyurethane prepolymer.

[0042] (2) Prepare raw materials according to the following formula

[0043]

[0044] (3) According to the above formula, mix 320g of polyurethane prepolymer with MEL30g, RDP50g, ammonium octamolybdate 10g, EG60g, 5μm kaolin 60g, fumed silica 10g, UV5315g, antioxidant 10102g, carbon Add 160g of black and 200g of DIDP into a double planetary mixer with a high-speed dispersing head, stir and mix it at 45°C and a low vacuum of less than 2kpa for 1.5h, then add 1g of VOS and 0.01g of DMDEE under the protection of air or high-purity nitrogen , Stir and disperse for 0.3h, an...

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Abstract

A halogen-free flame retardant polyurethane sealant and a preparation method thereof belonging to the technical field of sealant. The method is as below: first of all, preparing a polyurethane prepolymer; stirring and mixing the polyurethane prepolymer with a halogen-free flame retardant, a flame retardant synergistic agent, a carbon forming agent, a filler, a thixotropic agent, an ultraviolet absorbent, an antioxidant, a toner and a plasticizer under low vacuum condition less than 2 kPa at 35-60 DEG C in a double planetary mixer with high speed dispersing head or a three-roller grinding machine for 0.5-2 h; and then adding a water-removal agent and a catalyst A under the protection of nitrogen, mixing and dispersing for 0.1-0.5 h, and then mixing and dispersing under the condition with vacuum degree less than 2 KPa for 0.1-1 h to obtain the halogen-free flame retardant sealant. The invention inhibits the shortcomings of heavy smoke during burning, difficulty in self-extinguishing and severe droplet of the product.

Description

technical field [0001] The invention relates to an application formula of a halogen-free flame-retardant polyurethane sealant, which belongs to the technical field of sealants. Background technique [0002] Polyurethane sealant is a sealant with polyurethane prepolymer as the main component. The sealant has excellent elasticity, high tensile strength, excellent bonding performance, excellent toughness and wear resistance, and good chemical corrosion resistance and low temperature resistance. Therefore, this kind of sealant is mainly used in industries such as civil construction and transportation. [0003] The limiting oxygen index of unmodified polyurethane sealant is only about 17, which is an extremely flammable material. When it burns, the flame spreads quickly, the smoke is large, and it is accompanied by molten dripping. Because of its wide use in construction and other industries, its potential fire hazard has attracted people's attention. The flame retardant resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/48C09K3/10
Inventor 许弟陈宇赵欣王朝晖崔正
Owner 广东国望精细化学品有限公司
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