CN114347320A

CN114347320A - Preparation method of silicone rubber mold for resin casting body colloid performance test

Info

Publication number: CN114347320A
Application number: CN202210011439.9A
Authority: CN
Inventors: 曾兵; 李强; 姚淑芳; 王先前; 杨阳
Original assignee: China Academy of Building Research CABR
Current assignee: Shenzhen Municipal Design and Research Institute Co Ltd; China Academy of Building Research CABR
Priority date: 2022-01-06
Filing date: 2022-01-06
Publication date: 2022-04-15
Anticipated expiration: 2042-01-06
Also published as: CN114347320B

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 on a polyester film and fixing the square frame on a glass plate; uniformly placing a plurality of groups of steel positive molds after finish machining into the square frame; selecting mold glue with certain hardness, weighing the mold glue with required dosage, and proportioning according to the proportioning requirement of a curing agent; rapidly adding the uniformly stirred die glue into the square frame, standing, removing a plurality of groups of steel positive dies and the square frame after the die glue is hardened to obtain a silicon rubber die, and putting the silicon rubber die into a standard condition curing box for curing for 21 d; and (4) properly finishing the silicon rubber mold to obtain the final silicon rubber mold for testing.

Description

Preparation method of silicone rubber mold for resin casting body colloid performance test

Technical Field

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.

Background

The GB/T2567-2008 standard specifies a performance testing method for a resin casting body, but does not describe how to prepare a sample required by a related performance test, the standard specifies that a steel die and a rubber die can be used for preparing the sample, the steel die is mostly used for preparing the sample at present, and the steel die has the advantages of good size uniformity of the prepared sample in the sample preparation process, but is difficult to demould, and the internal damage and even damage of the sample are easy to occur.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a preparation method of a silicone rubber mold for a resin casting body colloid performance test, which comprises the steps of screening mold glue, selecting mold glue with proper hardness, and preparing the silicone rubber mold by using a steel male mold by comparing the mixing uniformity of the mold glue, whether the mold glue can be automatically defoamed, the integrity of the mold after casting, whether the demolding is difficult after preparing a sample and the size integrity of the sample.

In order to solve the problems, the invention adopts the following technical scheme:

a preparation method of a silicone rubber mold for testing the colloid performance of a resin casting body comprises the following steps:

the method comprises the following steps: preparing a square frame in advance, adhering the square frame on a polyester film, fixing the polyester film on a clean, flat and horizontal glass plate, and ensuring that the square frame is sealed and does not leak glue;

step two: uniformly coating release agents on the surfaces of a plurality of groups of finish-machined steel positive molds, and sequentially and uniformly placing the steel positive molds into the square frame, wherein the distance between the steel positive molds and the edge of the square frame is not less than 20mm, and the distance between the steel positive molds and the edge of the square frame is not less than 20 mm;

step three: selecting mold glue with certain hardness, weighing the mold glue with required dosage, and mixing the mold glue and the curing agent according to the curing agent ratio requirement, wherein the mass ratio of the mold glue to the curing agent is 100: 2, proportioning, adding a curing agent, and quickly and fully stirring uniformly;

step four: rapidly adding the uniformly stirred mold glue into the square frame, 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 positive molds and the square frame after the mold glue is hardened to obtain a silicon rubber mold, flatly placing the silicon rubber mold on a glass plate, and placing the silicon rubber mold into a standard condition maintenance box for maintenance for 21 d;

step five: and after the curing is finished, properly finishing the silicon rubber mold to obtain the final silicon rubber mold for testing.

Further, in the first step, the length and width of the square frame are 300mm × 300mm, and the thickness of the frame of the square frame is 10 mm.

Further, in the first step, the thickness of the polyester film is 0.15 mm.

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

Further, factors of mold preparation, sample preparation and sample test are comprehensively considered, and a specific hardness silicone rubber mold is selected.

Compared with the prior art, the invention achieves the following technical effects:

according to the invention, the silicone rubber mold is prepared mainly by the steel positive mold and selecting the mold rubber with proper hardness, and the obtained silicone rubber mold can improve the preparation efficiency and success rate of the resin casting body performance test sample and improve the detection efficiency and accuracy of the test result. Particularly, the silicon rubber mold prepared by the mold rubber with the hardness of 60 can meet the requirements of dimensional integrity and easy demolding, has certain hardness and deformation, and has high repeated utilization rate.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments.

Example 1

the method comprises the following steps: a square frame is prepared in advance, the length and width of the square frame are 300mm multiplied by 300mm, and the thickness of the frame of the square frame is 10 mm. The square frame is adhered to a polyester film with the thickness of 0.15mm, the polyester film is fixed on a clean, flat and horizontal glass plate, and the square frame is ensured to be sealed without glue leakage.

Step two: and uniformly coating a release agent on the surfaces of the multiple groups of finish-machined steel positive molds, and sequentially and uniformly placing the multiple groups of steel positive molds into the square frame, wherein the distance between the multiple groups of steel positive molds and the edge of the square frame is not less than 20mm, and the distance between the multiple groups of steel positive molds and the edge of the square frame is not less than 20 mm.

Step three: selecting mold glue with certain hardness, weighing the mold glue with required dosage, and mixing the mold glue and the curing agent according to the curing agent ratio requirement, wherein the mass ratio of the mold glue to the curing agent is 100: 2, proportioning, and adding the curing agent, and quickly and fully stirring uniformly.

Step four: rapidly adding the uniformly stirred mold glue into the square frame, 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 positive molds and the square frame after the mold glue is hardened to obtain a silicon rubber mold, flatly placing the silicon rubber mold on a glass plate, and placing the silicon rubber mold into a standard condition curing box for curing for 21 d.

And (3) experimental comparison:

selecting a high-viscosity adhesive, preparing an adhesive tensile property test piece by respectively using a silicon rubber mold and a steel mold with different hardness, curing for 21 days under standard conditions, and then performing a mold removal test.

Through experimental comparison, the aspects of mold preparation, sample test and the like are comprehensively considered, a silicone rubber mold prepared from mold rubber with the hardness of 60 is selected, and the test sample result is closest to the test result of a test sample prepared from a steel mold.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. a preparation method of silicone rubber mould for resin casting body colloid performance test, is characterized in that, comprises the steps:

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

Step 2: The finished steel male molds are evenly coated with mold release agent on the surface, and are evenly placed into the frame in turn. The spacing between the edges of the box is not less than 20mm;

Step 3: Select a certain hardness of the mold glue, weigh the required amount of mold glue, according to the curing agent ratio requirements, that is, the mass ratio of the mold glue and the curing agent is 100:2 for proportioning, after adding the curing agent, quickly and fully. stirring evenly;

Step 4: Quickly add the well-stirred mold glue to the box, and according to the flow of the mold glue, carry out an appropriate amount of mold glue, then let the mold glue in the box stand for 24 hours, and remove the mold glue after it hardens. Multiple groups of steel male molds and boxes are used to obtain silicone rubber molds, and the silicone rubber molds are placed flat on a glass plate and placed in a standard condition curing box for curing for 21 days;

Step 5: After the maintenance expires, properly trim the silicone rubber mold to obtain the silicone rubber mold for the final test.

2. the preparation method of a kind of silicone rubber mould for resin casting body colloid performance test according to claim 1, is characterized in that: in described step 1, the length and width of the frame is 300mm×300mm, and the frame of the frame is 300mm×300mm. The thickness is 10mm.

3 . The method for preparing a silicone rubber mold for colloidal performance test of a resin casting body according to claim 2 , wherein in the step 1, the polyester film has a thickness of 0.15 mm. 4 .

4. the preparation method of a kind of silicone rubber mould for resin casting body colloid performance test according to claim 1, is characterized in that: in the described step 3, the hardness of the mould glue selected is 30, 40, 50, 60 or 70.

5. the preparation method of a kind of silicone rubber mould for resin casting body colloid performance test according to claim 1, is characterized in that: comprehensively consider the factors of mould preparation, sample preparation, sample test, select concrete hardness silicone rubber mould.