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Polyurethane sealing pouring adhesive and its preparing process

A polyurethane and glue pouring technology, applied in the direction of polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve the problems of complex process, high colloid viscosity, easy entrainment of air bubbles, etc., to achieve simple preparation process, pouring Low viscosity, good leveling effect

Inactive Publication Date: 2008-07-02
TIANJIN LANGRUNSICHUANG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction speed and product quality of the existing "one-step" process are not easy to control, and it is easy to cause pores inside the solid to affect its electrical and mechanical physical properties
Although the "prepolymerization method" is easy to control in terms of quality, the process is complicated, and there are generally problems such as high colloidal viscosity and difficulty in pouring. defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Preparation of component A: Add 75Kg of HTPB, 15Kg of diluent fatty acid methyl ester and 10Kg of carbon black into the reaction kettle, stir and raise the temperature to 120°C, dehydrate under the residual pressure of 2.2Kpa for 50 minutes, then cool down to room temperature, and continue to Stir for 35 minutes under 2.2Kpa pressure to obtain component A. After discharging, seal and store component A in a container.

[0014] Preparation of component B: Add 90Kg of mixed liquefied MDI and 10Kg of catalyst dibutyltin laurate into the reaction kettle, stir, and stir for 30 minutes at room temperature and a residual pressure of 2.0Kpa to prepare component B, discharge the material, and store in in an airtight container.

Embodiment 2

[0016] Preparation of component A: Add 80Kg of HTPB, 10Kg of dioctyl phthalate and 10Kg of carbon black into the reaction kettle, stir and raise the temperature to 100°C, dehydrate for 60 minutes under a residual pressure of 1.5Kpa, and then drop to At room temperature, continue to stir for 20 minutes under 1.5Kpa residual pressure to obtain component A. After discharging, keep the obtained component A in a sealed container.

[0017] Preparation of component B: Add 90Kg of mixed liquefied MDI and 10Kg of catalyst dibutyltin laurate into the reaction kettle, stir; stir for 30 minutes at room temperature and a residual pressure of 2.0Kpa to prepare component B, discharge the material, and store in in an airtight container.

Embodiment 3

[0019] Preparation of component A: Add HTPB 78Kg, thinner dioctyl phthalate 12Kg and carbon black 10Kg into the reaction kettle, stir and heat up to 115°C, dehydrate under 2.5Kpa residual pressure for 55 minutes, then drop to At room temperature, continue to stir for 40 minutes under 2.5Kpa residual pressure to obtain component A. After discharging, keep the obtained component A in a sealed container.

[0020] Preparation of component B: Add 85Kg of mixed liquefied MDI and 15Kg of catalyst stannous octoate into the reaction kettle, stir, and stir for 40 minutes at room temperature and 3.0Kpa residual pressure to prepare component B, discharge the material, and store in an airtight in the container.

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PUM

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Abstract

The invention provides a polyurethane potting sealant, which is composed of a component A and a component B. The polyurethane potting sealant includes a diluting agent containing fatty acid methyl ester or dioctyl phthalate and a catalyst containing dibutyltin laurate or stannous octoate. The component A contains (by weight percentage) hydroxyl-terminated polybutadiene (HTPB) 60% to 80%, the diluting agent 10% to 25%, and carbon black 5% to 15%. The component B contains (by weight percentage) liquefied diphenylmethane-diisocyanate (DMI) 80% to 95% and the catalyst 5% to 20%. The polyurethane potting sealant of the invention has the advantages of low potting viscosity, good leveling property and less formation of air vents.

Description

technical field [0001] The invention relates to a polyurethane composition, in particular to a polyurethane sealing glue for cables and a preparation method thereof. Background technique [0002] Polyurethane materials are widely used because of their low curing stress, good hydrolysis resistance stability and electrical properties, and excellent cold and heat cycle resistance, which overcome the problems of epoxy resins in terms of cold and heat cycle resistance and impact resistance. Used in the potting of electrical appliances and cables. [0003] The preparation of polyurethane sealing glue can be divided into "one-step method" and "pre-polymerization method (two-step method)" in terms of technology. The reaction speed and product quality of the existing "one-step" process are not easy to control, and it is easy to cause pores inside the solid to affect its electrical and mechanical physical properties. Although the "prepolymerization method" is easy to control in term...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10C09J175/04H01B7/17
Inventor 孙贵平
Owner TIANJIN LANGRUNSICHUANG TECH DEV
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