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A kind of slow-setting adhesive for slow-bonding prestressed tendons and preparation method thereof

A slow-bonding prestressing and adhesive technology, which is applied in the field of building materials, can solve problems such as inability to stretch, insufficient retarding adhesive, high viscosity of retarding adhesive, etc., and achieve the effect of guaranteeing tension

Active Publication Date: 2017-04-12
北京兆福基新材料科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature difference between the production of retarding adhesive and the construction of retarded bonding prestressed tendons is large (cross-season), the viscosity often restricts each other: the temperature is higher during production and the temperature is lower during construction. In some cases, in order to ensure that the retarding adhesive does not drip during the coating process, the amount of diluent will be reduced and the viscosity of the retarding adhesive will be increased, but retardation will occur during tension construction If the viscosity of the adhesive is too high, it is difficult or even impossible to stretch the retarded bonded prestressed tendons; on the contrary, in the case of low temperature during production and high temperature during construction, if the retarded adhesive can Uniform coating will increase the amount of diluent and reduce the viscosity of the retarding adhesive, but when the reinforcement is constructed, the retarding adhesive will flow around due to the low viscosity, and then slowly bond the prestressed reinforcement. The retarding adhesive is not full and cannot meet the requirements of tension construction

Method used

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  • A kind of slow-setting adhesive for slow-bonding prestressed tendons and preparation method thereof
  • A kind of slow-setting adhesive for slow-bonding prestressed tendons and preparation method thereof
  • A kind of slow-setting adhesive for slow-bonding prestressed tendons and preparation method thereof

Examples

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preparation example Construction

[0047] The preparation method of the slow-bonding prestressed tendon provided by the embodiment comprises the following steps:

[0048] Step 1: kneading and stirring epoxy resin, organic oil, and dibutyl phthalate evenly under vacuum conditions to obtain the first mixture, and the kneading and stirring time is not less than 30 minutes;

[0049] Step 2: kneading and stirring the polyamide resin and N,N-dimethylethanolamine under vacuum conditions to obtain a second mixture;

[0050] Step 3: Knead and stir acetone, slag fine powder, the first mixture and the second mixture evenly under vacuum conditions to obtain a mixed material, and the kneading and stirring time is not less than 30 minutes;

[0051] Step 4: Use a three-roll machine to classify and grind the mixed material for three times, with the roller distances of each grinding being 1 mm, 0.5 mm, and 0.1 mm in turn, to obtain a slow-setting adhesive for slow-bonding prestressed tendons.

[0052] The preparation of the sl...

Embodiment 1

[0054] The present embodiment provides a retarding adhesive, which comprises the following compositions in parts by weight:

[0055] 30 parts by weight of epoxy resin (viscosity 8Pa·s), 2 parts by weight of organic oil, 2 parts by weight of polyamide resin (viscosity 15Pa·s), 1 part by weight of N,N-dimethylethanolamine, dibutyl phthalate 8 parts by weight of ester, 2 parts by weight of acetone and 58 parts by weight of slag fine powder.

[0056] The organic oil in this embodiment is at -10 ℃ and 10S -1 Under the condition of similar viscosity is the semi-fluid lithium grease of 80Pa · s, and the organic grease in the following examples and comparative examples is all identical with this.

[0057] The curing time of the retarding adhesive is 6 months, which is suitable for the production temperature below 25°C.

Embodiment 2

[0065] The present embodiment provides a retarding adhesive, which comprises the following compositions in parts by weight:

[0066] 35 parts by weight of epoxy resin (viscosity 10Pa·s), 4 parts by weight of organic oil, 1 part by weight of polyamide resin (viscosity 20Pa·s), 0.5 part by weight of N,N-dimethylethanolamine, dibutyl phthalate 4 parts by weight, 4 parts by weight of acetone and 60 parts by weight of slag fine powder.

[0067] The curing time of the retarding adhesive is 12 months, which is suitable for the production temperature below 25°C.

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Abstract

The invention provides a bond-retarded prestressed tendon setting-retarding adhesive and a preparation method thereof. The bond-retarded prestressed tendon setting-retarding adhesive is composed of, by weight part, 30-35 parts of epoxy resin, 0.5-2 parts of polyamide resin, 1-8 parts of organic oil, 0.1-1 part of N,N-dimethyethanolamine, 2-8 parts of dibutyl phthalate, 1-5 parts of acetone and 58-62 parts of superfine slag powder. The invention also discloses the preparation method of the bond-retarded prestressed tendon setting-retarding adhesive. The bond-retarded prestressed tendon setting-retarding adhesive obtains a setting time between 6 and 24 months and can adapt to the temperature of different production and application environments through different compositions, thereby ensuring the application performance stability in various seasons and geographical environments.

Description

technical field [0001] The invention relates to a slow-setting adhesive for slow-bonding prestressed tendons and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] Delayed bonded prestressed tendons are composed of three parts: prestressed tendons, retarded adhesives, and outer sheaths. Among them, retarded adhesives should have certain fluidity and good resistance to steel before the prestressed tendons are stretched. Adhesion to meet the index requirements of tension construction. After the tensioning construction is completed, the retarding adhesive gradually solidifies, and the cured retarding adhesive is firmly bonded to the prestressed tendons and the outer sheath, and is tightly occluded with the concrete through the concave-convex indentation of the outer sheath. Thereby producing the overall mechanical effect. [0003] In the existing technology, the curing time of the retarding adhesive is 3-12 mont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/20
Inventor 不公告发明人
Owner 北京兆福基新材料科技发展有限公司
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