CN114347320B - A method for preparing a silicone rubber mold for testing the colloid properties of a resin casting - Google Patents

Abstract

The invention relates to a preparation method of a silicone rubber mold for a resin casting body colloid performance test, and belongs to the technical field of building structure colloid performance detection. The method comprises the following steps: preparing a square frame in advance, adhering the square frame to a polyester film, and fixing the square frame to a glass plate; uniformly placing a plurality of groups of finished steel male dies into the square frame; selecting a mold adhesive with certain hardness, weighing the mold adhesive with required dosage, and proportioning according to the proportioning requirement of a curing agent; rapidly adding the uniformly stirred mold glue into the square frame, standing, removing a plurality of groups of steel male molds and the square frame after the mold glue is hardened to obtain a silicon rubber mold, and placing the silicon rubber mold into a standard condition curing box for curing 21d; the silicone rubber mold was appropriately trimmed to obtain a silicone rubber mold for final test.

Description

A method for preparing a silicone rubber mold for testing the colloid properties of a resin casting

Technical Field

The invention relates to a method for preparing a silicone rubber mould for a resin casting body colloid performance test, and belongs to the technical field of building structure adhesive performance detection.

Background Art

GB/T 2567-2008 standard specifies the performance test method for resin castings, but does not describe how to prepare the specimens required for the relevant performance tests. The standard stipulates that steel molds and rubber molds can be used to prepare specimens. Currently, steel molds are more commonly used to prepare specimens. The advantage of using steel molds to prepare specimens is that the size of the prepared specimens is uniform, but demolding is more difficult and the internal damage or even destruction of the specimens is likely to occur.

Summary of the invention

In view of the above problems in the prior art, the present invention provides a method for preparing a silicone rubber mold for a resin casting colloid performance test. By comparing the mixing uniformity of the mold glue, whether it can degas by itself, the integrity of the mold after casting, whether it is difficult to demold after preparing the sample, and the dimensional integrity of the sample, the mold glue is screened, the mold glue with appropriate hardness is selected, and a positive mold made of steel is used to prepare a silicone rubber mold.

To solve the above problems, the present invention adopts the following technical solutions:

A method for preparing a silicone rubber mold for a resin casting colloid performance test comprises the following steps:

Step 1: Prepare a square frame in advance, stick the square frame on a polyester film, fix the polyester film on a clean, flat, horizontal glass plate, and ensure that the square frame is sealed without glue leakage;

Step 2: Evenly apply a release agent on the surfaces of the multiple sets of finely processed steel positive molds, and place them into the frame one by one, with the spacing between the multiple sets of steel positive molds being no less than 20 mm, and the spacing from the edge of the frame being no less than 20 mm;

Step 3: Select a mold glue with a certain hardness, weigh the required amount of mold glue, and mix it according to the curing agent ratio requirements, that is, the mass ratio of mold glue to curing agent is 100:2. After adding the curing agent, stir it quickly and fully;

Step 4: quickly add the mold glue that has been stirred evenly into the frame, and according to the flow of the mold glue, add an appropriate amount of the mold glue, and then let the mold glue in the frame stand for 24 hours. After the mold glue hardens, remove the multiple sets of steel positive molds and the frame to obtain a silicone rubber mold, and place the silicone rubber mold flat on a glass plate and put it into a standard condition curing box for 21 days;

Step 5: After the curing period expires, the silicone rubber mold is properly trimmed to obtain the silicone rubber mold for the final test.

Furthermore, in step 1, the length and width of the frame are 300 mm×300 mm, and the frame thickness of the frame is 10 mm.

Furthermore, in the step 1, the thickness of the polyester film is 0.15 mm.

Furthermore, in step three, the hardness of the selected mold glue is 30, 40, 50, 60 or 70.

Furthermore, a silicone rubber mold with a specific hardness is selected by comprehensively considering factors such as mold preparation, sample preparation, and specimen testing.

Compared with the prior art, the present invention has achieved the following technical effects:

The present invention mainly prepares a silicone rubber mold by using a steel positive mold and selecting a mold glue with a suitable hardness. The obtained silicone rubber mold can improve the preparation efficiency and success rate of the resin casting performance test specimen, and improve the detection efficiency and the accuracy of the test results. In particular, the silicone rubber mold prepared by the mold glue with a hardness of 60 can meet the requirements of dimensional integrity and easy demoulding, the mold has a certain hardness and deformation, and the mold has a high reuse rate.

DETAILED DESCRIPTION

The technical solution of the present invention is further illustrated below through specific implementation methods.

Example 1

A method for preparing a silicone rubber mold for a resin casting colloid performance test comprises the following steps:

Step 1: Prepare a square frame in advance, the length and width of the frame are 300mm×300mm, and the frame thickness is 10mm. Paste the frame on a 0.15mm thick polyester film, fix the polyester film on a clean, flat, horizontal glass plate, and ensure that the frame is sealed without glue leakage.

Step 2: Apply release agent evenly on the surface of multiple sets of finely processed steel positive molds, and place them into the frame one by one. The spacing between multiple sets of steel positive molds should be no less than 20mm, and the spacing from the edge of the frame should be no less than 20mm.

Step 3: Select a mold glue of a certain hardness, weigh the required amount of mold glue, and mix it according to the curing agent ratio requirements, that is, the mass ratio of mold glue and curing agent is 100:2. After adding the curing agent, stir it quickly and thoroughly.

Step 4: Quickly add the evenly stirred mold glue into the frame, and add an appropriate amount of mold glue according to the flow of the mold glue. Then let the mold glue in the frame stand for 24 hours. After the mold glue hardens, remove multiple sets of steel positive molds and frames to obtain a silicone rubber mold. Place the silicone rubber mold flat on a glass plate and place it in a standard condition curing box for 21 days.

Step 5: After the curing period expires, the silicone rubber mold is properly trimmed to obtain the silicone rubber mold for the final test.

Experimental comparison:

A high-viscosity adhesive was selected, and silicone rubber molds and steel molds with different hardness were used to prepare adhesive tensile performance test pieces. After curing for 21 days under standard conditions, the molds were removed for testing.

Through experimental comparison, comprehensive consideration of mold preparation, sample preparation, specimen testing and other aspects, a silicone rubber mold prepared with a mold glue with a hardness of 60 was selected. The test results of the specimens were closest to the test results of the specimens prepared with steel molds.

The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims (1)

1. The preparation method of the silicone rubber mold for the resin casting body colloid performance test is characterized by comprising the following steps:

Step one: preparing a square frame in advance, adhering the square frame to a polyester film, fixing the polyester film on a clean, flat and horizontal glass plate, and ensuring that the square frame is sealed and not leaked; in the first step, the length and width dimensions of the square frame are 300mm multiplied by 300mm, and the thickness of the square frame is 10mm; the thickness of the polyester film is 0.15mm;

Step two: uniformly smearing a release agent on the surfaces of the finished multiple groups of steel male dies, and sequentially and uniformly putting the multiple groups of steel male dies into the square frame, wherein the intervals between the multiple groups of steel male dies are not less than 20mm, and the intervals between the multiple groups of steel male dies and the edges of the square frame are not less than 20mm;

Step three: selecting die glue with the hardness of 30, 40, 50, 60 or 70, wherein the mass ratio of the die glue to the curing agent is 100:2, proportioning, and after adding the curing agent, stirring rapidly and fully uniformly;

step four: adding the uniformly stirred mold glue into the square frame rapidly, supplementing a proper amount of the mold glue according to the flowing condition of the mold glue, standing the mold glue in the square frame for 24 hours, removing a plurality of groups of steel male molds and the square frame after the mold glue is hardened to obtain a silicon rubber mold, horizontally placing the silicon rubber mold on a glass plate, and placing the glass plate in a standard condition curing box for curing for 21 days;

Step five: after curing, the silicone rubber mold is properly trimmed to obtain the final silicone rubber mold for the test.