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Inorganic magnesium-based adhesive for bonding and grouting broken stone cultural relics and preparation method of inorganic magnesium-based adhesive

A technology of stone cultural relics and magnesium-based glue, applied in inorganic adhesives, adhesives, adhesive additives, etc., can solve the problems of poor aging resistance of organic glues, destroy the aesthetic value of cultural relics, reduce bonding strength, etc., and achieve weather resistance. Excellent properties, wide application temperature range, low density effect

Active Publication Date: 2021-10-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the aging resistance of organic adhesives is poor. After the adhesive layer ages, the bonding strength decreases, and the color of the adhesive layer becomes darker and darker. Today, many ruins and museum stone relics can often see the bonding traces of organic adhesives after aging. , which obviously destroys the aesthetic value of cultural relics; organic glue is a polymer material, and its hydraulic properties are significantly different from inorganic rocks. After the adhesive is solidified in the rock, water, salt, etc. cannot pass through the bonding surface, resulting in damage. sexual stress
In addition, the bonding strength of epoxy and other adhesives is much higher than the strength of the rock itself, which does not meet the basic principle that the bonding strength should be slightly smaller than the strength of the cultural relics in the protection of cultural relics.
In addition, the organic adhesive that penetrates into the rock and is cross-linked and solidified is irreversible, and it is difficult to remove it from the cultural relics.

Method used

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  • Inorganic magnesium-based adhesive for bonding and grouting broken stone cultural relics and preparation method of inorganic magnesium-based adhesive
  • Inorganic magnesium-based adhesive for bonding and grouting broken stone cultural relics and preparation method of inorganic magnesium-based adhesive
  • Inorganic magnesium-based adhesive for bonding and grouting broken stone cultural relics and preparation method of inorganic magnesium-based adhesive

Examples

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Effect test

preparation example Construction

[0029] Also disclosed is a method for preparing an inorganic magnesium-based adhesive for bonding and grouting fractured stone cultural relics, characterized in that the steps are as follows:

[0030] 1) Distill deionized water into MgCl according to the mass ratio 2 ·6H 2 O:H 2 O=1: (0.89~1.42) ratio joins in the magnesium chloride hexahydrate, prepares the magnesium chloride solution;

[0031] 2) Add a small amount of MgO powder with a mass fraction of 28% to 45% to MgCl several times 2 In the solution, stir evenly while adding to obtain a preliminary MMH slurry;

[0032] 3) adding salicylic acid with a mass fraction of 0.5% to 3% to the above-mentioned preliminary MMH slurry and ultrasonicating for 30 minutes to disperse the salicylic acid evenly therein to obtain the MMH adhesive;

[0033] 4) Add ionized water and fillers in an appropriate amount to obtain a paste that is convenient for bonding and grouting.

[0034] The present invention can also optimize the perform...

Embodiment 1

[0042] 1. Preparation of adhesive

[0043] Accurately weigh 18.00g H 2 O and 20.33 g MgCl 2 ·6H 2 O, deionized water is added in the magnesium chloride, the preparation magnesium chloride solution. Then, 31.11g of MgO powder was added to MgCl several times in small amounts 2Stir in the solution. After stirring evenly, 0.701 g of salicylic acid was added, and the sample was placed in an ultrasonic cleaner for 30 minutes of ultrasonication, so that the salicylic acid was evenly dissolved in it to obtain the MMH adhesive.

[0044] 2. Adhesive performance test

[0045] (1) Mechanical strength test Pour the prepared adhesive into a cubic silicone mold (20mm×20mm×20mm), and then shake the mold gently to discharge the air in it. After 2 days, the samples were removed from the molds. Maintain in an environment with a temperature of 25±10°C and a relative humidity of 60±20%. The compressive strength of the samples after curing for 7 days and 28 days were respectively tested wit...

Embodiment 2

[0048] The preparation method of the adhesive is the same as in Example 1. The prepared MMH adhesive was used to bond sandstone samples (lapping surface: 50mm×30mm). First, apply the adhesive evenly on the butt joint surface, and then fix the joint. After the adhesive is completely cured (28 days), the flexural strength is 4.394 MPa.

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Abstract

The invention discloses an inorganic magnesium-based adhesive for bonding and grouting broken stone cultural relics and a preparation method of the inorganic magnesium-based adhesive. The inorganic magnesium-based adhesive comprises the following components in percentage by mass: 28-45% of magnesium oxide, 28-30% of magnesium chloride hexahydrate, 0.5-3.0% of salicylic acid and 1% of deionized water. The adhesive provided by the invention has the following characteristics: the adhesive is completely composed of inorganic matters, and has good binding force with rocks and excellent weather resistance; the adhesive can be cured at normal temperature, the curing rate is moderate, and sufficient time can be left for bonding operation; after being cured, the adhesive has very strong tolerance to high and low temperatures, and is resistant to salt corrosion and water corrosion; the performance of the adhesive can be optimized by adding fillers such as original stone powder, so that the strength and vision of the adhesive are similar to those of a cultural relic body; and after being cured, the adhesive has water permeability and air permeability, is compatible with inorganic rocks in hydraulic property, and does not form stress damage.

Description

technical field [0001] The invention belongs to the field of cultural relics protection, and in particular relates to an inorganic magnesium-based adhesive used for bonding and grouting fractured stone cultural relics and a preparation method thereof. Background technique [0002] Affected by factors such as mechanical stress, natural disasters, and man-made damage, stone cultural relics often break, and some even threaten the long-term preservation of cultural relics, so the cultural relics must be bonded and grouted. The use of adhesives can reassemble broken and broken cultural relics, which is of great significance for preserving the historical value, artistic value and cultural relic value of cultural relics. At present, the bonding materials for stone cultural relics can be roughly divided into organic adhesives and inorganic adhesives. Organic adhesives such as epoxy resin glue and its modified materials, acrylic resin glue, silicone resin glue, etc. have been widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J1/00C09J11/04C09J11/06
CPCC09J1/00C09J11/04C09J11/06
Inventor 张秉坚谢丽娜
Owner ZHEJIANG UNIV
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