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Adhesive with controllable attenuation of bonding strength and preparation method thereof

A bonding strength and adhesive technology, applied in the direction of adhesives, adhesive types, adhesive additives, etc., can solve the problem of later strength decay, high initial bonding strength, strength will increase with time, etc. problem, to achieve the effect of improving water absorption

Active Publication Date: 2022-06-28
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Paste the curing material on the formwork, and when the concrete to be poured is hardened and demoulded, the curing material will remain on the concrete surface, which can reduce the maintenance workload, but the traditional adhesive has a higher bonding strength, and the strength will decrease with time. Improvement, concrete hardening and demoulding cannot be achieved because the curing material is firmly adhered to the surface of the formwork, and as the formwork is separated from the concrete, it cannot remain on the surface of the concrete
At present, an adhesive with high initial bonding strength and rapid attenuation of later strength has not been found. The purpose of the present invention is to provide an adhesive with controllable attenuation of bonding strength and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The parts by weight of each raw material in the adhesive with controllable attenuation of bonding strength are:

[0022] 45 parts of polyester polyol;

[0023] 3 parts calcium hydroxide;

[0024] 1 part sodium hydroxide;

[0025] 49.5 parts of isocyanate prepolymer;

[0026] 1 part of silicone;

[0027] 0.5 part of catalyst.

[0028] (2) The preparation steps include:

[0029] (1) mixing quantitative polyester polyol, calcium hydroxide, sodium hydroxide, catalyst etc. at room temperature to obtain A component;

[0030] (2) isocyanate prepolymer and organosilicon are mixed uniformly to obtain B component;

[0031] (3) The B component is added to the A component to obtain an adhesive with controllable attenuation of the bonding strength.

[0032] The water-permeable template cloth was adhered to the surface of the steel template with the obtained adhesive, and the initial bonding strength was 1.2MPa. When placed under 90% humidity for 120min, the bond strength ...

Embodiment 2

[0034] (1) The parts by weight of each raw material in the adhesive with controllable attenuation of bonding strength are:

[0035] 40 parts of polyester polyol;

[0036] 5 parts of calcium hydroxide;

[0037] 1 part sodium hydroxide;

[0038] 53 parts of isocyanate prepolymer;

[0039] 1 part of silicone;

[0040] 0.5 part of catalyst.

[0041] (2) The preparation steps include:

[0042] (1) mixing quantitative polyester polyol, calcium hydroxide, sodium hydroxide, catalyst etc. at room temperature to obtain A component;

[0043] (2) isocyanate prepolymer and organosilicon are mixed uniformly to obtain B component;

[0044] (3) The B component is added to the A component to obtain an adhesive with controllable attenuation of the bonding strength.

[0045] The water-permeable template cloth was adhered to the surface of the steel template with the obtained adhesive, and the initial bonding strength was 1.15MPa. When placed under 90% humidity for 120min, the bond strengt...

Embodiment 3

[0047] (1) The parts by weight of each raw material in the adhesive with controllable attenuation of bonding strength are:

[0048] 30 parts of polyester polyol;

[0049] 4 parts calcium hydroxide;

[0050] 1.5 parts of sodium hydroxide;

[0051] 57 parts of isocyanate prepolymer;

[0052] 7 parts of silicone;

[0053] 0.5 part of catalyst.

[0054] (2) The preparation steps include:

[0055] (1) mixing quantitative polyester polyol, calcium hydroxide, sodium hydroxide, catalyst etc. at room temperature to obtain A component;

[0056] (2) isocyanate prepolymer and organosilicon are mixed uniformly to obtain B component;

[0057] (3) The B component is added to the A component to obtain an adhesive with controllable attenuation of the bonding strength.

[0058] The water-permeable template cloth was adhered to the surface of the steel template with the obtained adhesive, and the initial bonding strength was 0.95MPa. When placed under 90% humidity for 120min, the bond str...

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Abstract

The present invention relates to an adhesive with controllable attenuation of bonding strength and a preparation method thereof. The preparation method is characterized in that based on 100 parts of the material, the mass content of each component is: 25-45 parts of polyester polyol, 3-5 parts of calcium hydroxide, 1-2 parts of sodium hydroxide, isocyanate prepolymerized 40-60 parts of compound, 1-10 parts of silicone, 0.1-1.0 parts of catalyst. The invention breaks through the problem of high bonding strength of traditional adhesives and uncontrollable attenuation during the service process, and solves the problem that high bonding strength is required for curing materials in the initial stage of film application in railway engineering, and low bonding strength is required for concrete demoulding. technical bottleneck.

Description

technical field [0001] The invention belongs to the technical field of adhesive materials, and in particular relates to an adhesive with controllable attenuation of bonding strength and a preparation method thereof. Background technique [0002] Early and reasonable maintenance is a key control link to ensure the quality of concrete projects, and it is very important to control the cracks caused by drying shrinkage and temperature gradients in concrete. Covering the concrete surface with curing materials can realize the curing of the concrete, reduce the risk of drying shrinkage cracking and temperature stress cracking of the concrete, and improve the durability of the concrete structure. The curing material is attached to the formwork, and the curing material is left on the concrete surface when the concrete to be poured is hardened and demolded, which can reduce the maintenance workload, but the traditional adhesive has high bonding strength, and the strength will increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J11/06C04B40/00
CPCC09J175/06C09J11/06C04B40/0092C08K5/5425C08K5/5435C08K5/544
Inventor 董全霄程冠之谢永江郑新国谭盐宾李世达夏思盟刘竞李书明曾志冯仲伟李林香杨鲁李康刘子科翁智财王月华蒋睿谢清清王伟唯赵萍
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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