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A kind of preparation method of joint sealing material

A technology of sealing materials and raw materials

Inactive Publication Date: 2019-05-07
SHANXI SIFANG HENGTAI WATERPROOF MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The various deficiencies of the above-mentioned polyurethane sealant limit its application

Method used

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  • A kind of preparation method of joint sealing material
  • A kind of preparation method of joint sealing material

Examples

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Effect test

preparation example Construction

[0031] The technical solution of the present invention is a preparation method of a joint filling and sealing material, including the following steps:

[0032] A preparation

[0033] 1) Part A: (parts by weight)

[0034] Polyether polyol DL-2000D 60-80

[0035] Polyether polyol EP-330N 10-30

[0036] Diphenylmethane diisocyanate MDI-50 10-20

[0037] 2) Part B: (parts by weight)

[0038] Polyether polyol EP-330N 30-60

[0039] Chlorinated Paraffin-52 50-60

[0040] Amine chain extender (MOCA) 5

[0041] Organometallic catalyst 1

[0042] Talc 80

[0043] Softeners and defoamers 14

[0044] B. Preparation

[0045] Add the polyether polyol in the first component into the container, stir, heat up to 60-80°C, add MDI-50, heat up to 80°C, react at 80±2°C for 2h, and determine when the NCO content of the system reaches the predetermined value , Stop the reaction. After the reaction is completed, the temperature is lowered and vacuum degassing for 30 minutes, and the material is discharged to obtain ...

Embodiment 1

[0070] Follow the steps A, B, D, and E described in the above specific embodiment. among them:

[0071] A preparation

[0072] 1) Part A: (parts by weight)

[0073] Polyether polyol DL-2000D 60

[0074] Polyether polyol EP-330N 10

[0075] Diphenylmethane diisocyanate MDI-50 10

[0076] 2) Part B: (parts by weight)

[0077] Polyether polyol EP-330N 30

[0078] Chlorinated Paraffin-52 50

[0079] B. Preparation

[0080] Add the polyether polyol in component A into the container, stir, and heat to 60°C;

[0081] After the component B is stirred and dispersed evenly, it is heated to 100°C.

Embodiment 2

[0083] Repeat Example 1 but,

[0084] A preparation

[0085] 1) Part A: (parts by weight)

[0086] Polyether polyol DL-2000D 80

[0087] Polyether polyol EP-330N 30

[0088] Diphenylmethane diisocyanate MDI-50 20

[0089] 2) Part B: (parts by weight)

[0090] Polyether polyol EP-330N 60

[0091] Chlorinated Paraffin-52 60

[0092] B. Preparation

[0093] Add the polyether polyol in the first component into the container, stir, heat up to 80°C, add MDI-50, heat up to 80°C, after the reaction is completed, cool down and degas in vacuum for 20 minutes;

[0094] After the component B is stirred and dispersed evenly, it is heated to 110°C and dehydrated under vacuum for 2 hours.

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Abstract

The invention discloses a preparation method of a joint sealing material. The preparation method comprises the following steps: a component A and a component B are prepared, a polyurethane prepolymer and a curing agent are prepared respectively, the component A and the component B are prepared in the weight ratio being 1:2 in a construction site, and joints are filled with a caulking gun. The polyurethane joint sealing material can be cured at the room temperature, has higher adhesive strength, good caulking performance and prominent expansion deformation capacity for expansion joints of a concrete structure, can be widely used for sealing of road joints and is especially applicable to sealing of concrete expansion joints of ballastless tracks of expressways.

Description

Technical field [0001] The invention belongs to the technical field of sealants, and specifically relates to a preparation method of a joint filling and sealing material. Background technique [0002] With the rapid development of my country's high-speed railways, slab ballastless track occupies a large proportion of my country's high-speed railway tracks, and the convex block between every two track slabs needs sealant caulking. In order to prevent the concrete track bed slab from deforming and cracking due to external factors, leading to structural damage, it is usually necessary to reserve a certain number of shrinkage joints and construction joints during the construction process, so joint filling materials are often used to seal such gaps. Choosing good joint filling materials is very important to improve the durability of concrete pavement. At present, the filling materials at the joints are mainly asphalt or modified asphalt. The main defect of these materials is that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C08G18/48C08G18/12C08G18/32
CPCC08G18/12C08G18/4812C08G2190/00C09J175/08C08G18/48C08G18/3814
Inventor 赵宝生赵永生赵根生
Owner SHANXI SIFANG HENGTAI WATERPROOF MATERIALS
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