Moisture-curing polyurethane material having a long gel time

A polyurethane adhesive and adhesive technology, applied in the field of polyurethane adhesives, can solve problems such as uncomfortable construction and high vapor pressure

Inactive Publication Date: 2006-12-20
MCP IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, due to the high vapor pressure of TDI, it is uncomfortable to apply with materials containing TDI

Method used

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  • Moisture-curing polyurethane material having a long gel time
  • Moisture-curing polyurethane material having a long gel time
  • Moisture-curing polyurethane material having a long gel time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The adhesive is mixed with recycled rubber powder to make an elastic surface material. The adhesive is prepared as follows: Mix 698 parts by weight (eg, grams) of polyether polyol (a diol with a molecular weight of 4000, Shell's PPG-4000) , 7 parts by weight of two (propylene glycol), 295 parts by weight of diphenylmethane diisocyanate (4,4'- and 2,4'-diphenylmethane diisocyanate 50 / 50 mixture). Adhesive was stirred at 80°C for 2 hours to form a colorless oily polyurethane prepolymer. The resulting prepolymer adhesive contained 8% by weight of isocyano (NCO) and had a viscosity of 2700cP at 27°C. The gel time was 4.9 hours under the conditions of dew point and 77% humidity. The adhesive had a cured sheet tensile strength of 2121 psi and an elongation at break of 622%.

[0025] Prepare a mixture of 200 grams of prepolymer binder and 800 grams of recycled rubber powder with a particle size of 1-3mm, stir the mixture so that the recycled rubber powder is completely wetted...

Embodiment 2

[0027] 7 parts by weight of bis(propylene glycol) were mixed with 295 parts by weight of diphenylmethane diisocyanate (50 / 50 mixture of 4,4'- and 2,4'-diphenylmethane diisocyanate). Stir at 35-55°C for 1 hour, then add 698 parts by weight of polyether polyol (a diol with a molecular weight of 4000, Shell's PPG-4000), and stir for another 2 hours at 80°C to obtain The polyurethane adhesive contains 8% by weight of isocyano (NCO), the viscosity at 26°C is 2800cP, and the gel time is 4.7 hours at 25°C, 22°C dew point, and 84% humidity. The cured sheet of the polyurethane adhesive has a tensile strength of 2080 psi and an elongation at break of 630%.

[0028] Prepare a mixture consisting of 200 grams of polyurethane adhesive and 800 grams of recycled rubber powder with a particle size of 1-3mm, stir the mixture so that the recycled rubber powder is completely wetted by the adhesive, and then pour half of it into 48× In a 30×2cm pan, use a roller to press it into a 9.5-10.5cm unif...

Embodiment 3

[0030] Adhesive is obtained as follows: the diphenylmethane diisocyanate (4, 4, 4'- and 2,4'-diphenylmethane diisocyanate 50 / 50 mixture). The mixture was stirred at 80° C. for 2 hours, cooled to 65° C., then added with 7 parts by weight of di(propylene glycol), stirred at 40-65° C. for 1 hour, and the obtained polyurethane adhesive was a colorless oil. Contains 8% by weight of isocyano (NCO), viscosity at 25°C is 3200cP, gel time is 5 hours at 25°C, 18°C ​​dew point, 64% humidity. The adhesive had a cured sheet tensile strength of 2160 psi and an elongation at break of 590%.

[0031] Prepare a mixture consisting of 200 grams of polyurethane adhesive and 800 grams of recycled rubber powder with a particle size of 1-3mm, stir the mixture so that the recycled rubber powder is completely wetted by the adhesive, and then pour half of it into 48×30×2cm In the pan, use a roller to press it into a uniform sheet of 9.5-10.5cm, and cure it in the sun at 30-36°C for 4 hours; pour the o...

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Abstract

A polyurethane adhesive composition having a long pot life that does not cause its user to experience breathing difficulty is described. In one embodiment, the adhesive is prepared from a mixture of a high molecular weight component, an isocyanate, and a proton donor.

Description

technical field [0001] Generally, the present invention relates to a novel one-component polyurethane adhesive joint material, and more particularly, the present invention relates to a polyurethane adhesive with a relatively long pot life. Background technique [0002] Surfaces for sports fields are typically manufactured using a mixture of moisture-curing polyurethane binder and recycled rubber powder. Among them, the selection of adhesive components is restricted by several factors, including the cost of adhesive components, the physical properties of the adhesive, and the quality of the final product. In addition, polyurethane adhesives containing volatile irritating ingredients can be offensive to frequent users. [0003] There are two commonly used polyurethane adhesives: one containing diphenylmethane diisocyanate (MDI); the other is a mixture of toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI). One-component adhesives for moisture-curing polyurethan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08L97/02C08L21/00C08K7/14
CPCC08G2190/00C09J175/08C08G18/6674C08L75/00C08G18/12C08L19/003C08G18/10C09J175/04C08L17/00C08L2666/08C08G18/3206C08G18/4825C08G18/307C08L2666/14
Inventor 托马斯·A·格莱特杜先献
Owner MCP IND
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