CN113201300A - Foam rubber and preparation method thereof - Google Patents

Abstract

The invention discloses a foam adhesive and a preparation method thereof, belonging to the technical field of adhesives. The foam rubber comprises the following raw materials in parts by weight: 90-110 parts of epoxy resin, 22-24 parts of curing agent, 14-16 parts of dibutyl phthalate and 0.8-1.2 parts of glass beads. The preparation method of the foam rubber comprises the following steps: (1) weighing epoxy resin and dibutyl phthalate according to a proportion, pouring the weighed dibutyl phthalate into the epoxy resin, and uniformly stirring to obtain a mixed solution I; (2) weighing a curing agent according to a proportion, adding the curing agent into the mixed solution I prepared in the step (1), and uniformly stirring to obtain a mixed solution II; (3) and (3) weighing glass beads according to a proportion, adding the glass beads into the mixed solution II prepared in the step (2), and uniformly stirring to obtain the required foam rubber. The invention solves the problem that the prior foam rubber has fracture risk due to unqualified compressive strength and compressive modulus. The foam rubber is low in price and excellent in fracture performance.

Description

Foam rubber and preparation method thereof

Technical Field

The invention relates to the technical field of adhesives, and particularly relates to a foam adhesive and a preparation method thereof.

Background

The foam adhesive is also called filling adhesive and is characterized by light weight, good adhesive property, no obvious volume change before and after curing and normal temperature curing. The foam adhesive is generally prepared from two parts, namely epoxy adhesive and curing agent, is in a dough shape after being prepared, is cured at normal temperature, and is convenient to fill. The product is synthesized by using the foaming gel chemical raw material, adopts a benzene-free mixed solvent, belongs to an environment-friendly product, has no special peculiar smell, is quick to dry on the surface, is firmly pasted, has good water resistance and weather resistance and the like. However, the existing foam rubber with better performance is generally an imported product, is expensive and difficult to purchase, and although the price of a domestic substitute is low, the domestic substitute often does not reach the standards in the aspects of the compressive strength and the compressive modulus. In the process of batch use, the material compression strength and the compression modulus of the domestic substitute are not up to the standard, so that the fracture risk exists, and great trouble is brought to users.

Therefore, there is a need for a new foam adhesive to improve the problems of the prior art and replace the existing imported products.

Disclosure of Invention

In order to solve the problem that the domestic foam rubber provided in the background art has fracture risk because the compression strength and the compression modulus do not reach the standard, the invention provides the foam rubber which is low in price and excellent in fracture performance.

In order to achieve the purpose, the invention adopts the technical scheme that:

the foam rubber comprises the following raw materials in parts by weight: 90-110 parts of epoxy resin, 22-24 parts of curing agent, 14-16 parts of dibutyl phthalate and 0.8-1.2 parts of glass beads.

Preferably, the epoxy resin is 95 to 105 parts.

Preferably, the glass beads are 0.9 to 1.1 parts.

Preferably, the feed comprises the following raw materials in parts by weight: 100 parts of epoxy resin, 23 parts of curing agent, 15 parts of dibutyl phthalate and 1 part of glass beads.

Preferably, the epoxy resin is epoxy resin 618.

Preferably, the curing agent is a50 curing agent.

Preferably, the foam has a density of 0.48 to 0.52 g/cc.

The invention also provides a preparation method of the foam rubber, which comprises the following steps:

(1) weighing epoxy resin and dibutyl phthalate according to a ratio, pouring the weighed dibutyl phthalate into the epoxy resin, and uniformly stirring to obtain a mixed solution I;

(2) weighing a curing agent according to a proportion, adding the weighed curing agent into the mixed solution I prepared in the step (1), and uniformly stirring to obtain a mixed solution II;

(3) and (3) weighing the glass beads according to the proportion, adding the weighed glass beads into the mixed solution II prepared in the step (2), and uniformly stirring to obtain the required foam adhesive.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the epoxy resin, the curing agent, the dibutyl phthalate and the glass beads are combined according to a certain proportion to optimize the compression strength and the compression modulus of the existing domestic foam adhesive, so that the aim of improving the breaking strength of the existing domestic foam adhesive is fulfilled. The breaking strength of the foam rubber prepared by the invention is superior to that of the foam rubber imported from abroad, and the preparation cost is far lower than the procurement cost of the imported foam rubber. Specifically, the preparation cost of the foam rubber is about 5% of the purchase price of the foreign imported foam rubber with the same volume, so that the foam rubber prepared by the formula and the preparation method disclosed by the invention is high in cost performance and good in use effect, and can completely replace the foreign imported foam rubber.

Drawings

FIG. 1 is a honeycomb underfill test piece made with the foam of the present invention;

FIG. 2 is a comparative test piece using imported EPOCAST1629A/B honeycomb filler glue.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example (b):

the foam rubber provided by the invention comprises the following raw materials in parts by weight: 90-110 parts of epoxy resin 618, 22-24 parts of A50 curing agent, 14-16 parts of dibutyl phthalate and 0.8-1.2 parts of glass beads. The preparation method of the foam rubber comprises the following steps:

(1) weighing epoxy resin 618 and dibutyl phthalate in proportion, pouring the weighed dibutyl phthalate into the epoxy resin 618, and uniformly stirring to obtain a mixed solution I;

(2) weighing the curing agent A50 according to a ratio, adding the weighed curing agent A50 into the mixed liquid I prepared in the step (1), and uniformly stirring to obtain a mixed liquid II;

(3) and (3) weighing the glass beads according to the proportion, adding the weighed glass beads into the mixed solution II prepared in the step (2), and uniformly stirring to obtain the required foam adhesive.

The foam rubber is prepared from the following components in parts by weight:

table one, the raw material ratios in the examples are:

example 6:

the foam rubber is prepared by adopting the raw material ratio in the embodiment 1, and the steps are as follows:

(1) weighing 90 parts of epoxy resin 618 by using a paper cup and a platform scale, weighing 14 parts of dibutyl phthalate by using the same method, pouring the weighed dibutyl phthalate into the epoxy resin 618, and uniformly stirring by using a glass rod to obtain a mixed solution I;

(2) weighing 24 parts of A50 curing agent by the weighing method in the step (1), adding the curing agent into the mixed solution I prepared in the step (1), and uniformly stirring the curing agent by a glass rod to obtain mixed solution II;

(3) and (3) weighing 1.2 parts of glass beads by using the weighing method in the step (1), adding the weighed glass beads into the mixed solution II prepared in the step (2), and uniformly stirring by using a glass rod to obtain the required foam rubber.

Example 7:

the preparation of the foam rubber by adopting the raw material ratio of the embodiment 3 comprises the following steps:

(1) weighing 100 parts of epoxy resin 618 by using a glass cup and a platform scale, weighing 15 parts of dibutyl phthalate by using the same method, pouring the weighed dibutyl phthalate into the epoxy resin 618, and uniformly stirring by using a stirrer to obtain a mixed solution I;

(2) weighing 23 parts of A50 curing agent by the weighing method in the step (1), adding the A50 curing agent into the mixed solution I prepared in the step (1), and uniformly stirring by using a stirrer to obtain mixed solution II;

(3) and (3) weighing 1 part of glass beads by using the weighing method in the step (1), adding the weighed glass beads into the mixed solution II prepared in the step (2), and uniformly stirring by using a stirrer to obtain the required foam rubber.

Example 8:

the preparation of the foam rubber by adopting the raw material ratio of the embodiment 5 comprises the following steps:

(1) weighing 110 parts of epoxy resin 618 by using a glass cup and a platform scale, weighing 16 parts of dibutyl phthalate by using the same method, pouring the weighed dibutyl phthalate into the epoxy resin 618, and uniformly stirring by using a glass rod to obtain a mixed solution I;

(2) weighing 22 parts of A50 curing agent by the weighing method in the step (1), adding the A50 curing agent into the mixed solution I prepared in the step (1), and uniformly stirring the mixture by a glass rod to obtain mixed solution II;

(3) and (3) weighing 0.8 part of glass beads by using the weighing method in the step (1), adding the weighed glass beads into the mixed solution II prepared in the step (2), and uniformly stirring by using a glass rod to obtain the required foam rubber.

The preparation of the remaining examples is as above.

It should be noted that the foam rubber obtained by the above preparation method needs to be used within 45min after the preparation is completed, and is cured at normal temperature for at least 24 h.

The physical densities of the foams prepared in examples 6, 7 and 8 were measured and are shown in Table II:

table two. foam density test results:

	example 6	Example 7	Example 8
				Density of foamed rubber	0.48g/cc	0.51g/cc	0.52g/cc

As can be seen from the table two, the density of the prepared foam is between 0.48 and 0.52g/cc, and meets the requirement, and the density size is gradually reduced along with the increase of the content of the glass microspheres added in the foam.

In addition, the foam rubber prepared in example 6 needs to be subjected to a mechanical fracture performance test, fracture performance data is measured, and the fracture performance data is compared with that of a comparative example tested under the same conditions. The comparative example used an imported EPOCAST1629A/B honeycomb filler test piece.

Wherein the preparation process of the sample is as follows:

(1) preparing a flat plate die (765mm multiplied by 565mm) and coating a release agent (product brand: FREK0TE 770-NC) on the die twice, wherein the interval between the two times is at least 15 min;

(2) cutting two honeycomb paper blocks (product brand: NH-1-2.7-48-3) of 190mm × 150 mm;

(3) and (2) paving two pieces of glass cloth prepreg (product brand:

28-38％-EGLASS-125-1000)200mm×160mm；

(4) laying the two paper honeycombs prepared in the step (2) on the two glass cloths in the step (3) in the middle respectively;

(5) preparation of the foam of the invention: the foam prepared in example 6 was taken;

preparation of comparative foam: weighing 100 parts of EPOCAST1629A by using a paper cup and a platform scale, weighing 50 parts of EPOCAST1629B by using the same method, adding the EPOCAST1629A into the paper cup and the platform scale, and stirring the mixture uniformly by using a glass rod;

(6) filling the prepared two kinds of foam adhesives into the two paper honeycombs in the step (4) respectively by using a scraper, and scraping the upper surface of each honeycomb cell by using the scraper;

(7) sequentially laying a layer of nonporous isolating membrane, a pressure equalizing plate and a breathable felt on the upper surface of each paper honeycomb;

(8) manufacturing a vacuum bag, vacuumizing the interior of the vacuum bag, and curing at normal temperature for at least 24 hours;

(9) after the solidification is finished, removing auxiliary materials such as a vacuum bag and the like;

(10) the test pieces prepared from the foam rubber of the present invention were numbered 1-1, 1-2 and 1-3, and the comparative test pieces prepared from the foam rubber of EPOCAST1629A and EPOCAST1629B material were numbered 2-1, 2-2 and 2-3.

The fracture performance test process comprises the following steps:

(1) testing the sizes and appearances of the test pieces numbered 1-1, 1-2 and 1-3 and the comparative test pieces numbered 2-1, 2-2 and 2-3 according to the manufacturing requirements;

(2) adjusting the span to 125mm, and measuring the span to 0.5mm accurately;

(3) adjusting the loading head to be positioned in the center of the sample;

(4) adjusting the loading speed to 1 mm/min-2 mm/min;

(5) load until the specimen breaks and record the load value.

Table three fracture performance test results:

it can be seen from table three that the breaking properties of the foam of the present invention are superior to those of foams prepared with materials EPOCAST1629A and EPOCAST 1629B.

Claims (8)

1. The foam rubber is characterized by comprising the following raw materials in parts by weight: 90-110 parts of epoxy resin, 22-24 parts of curing agent, 14-16 parts of dibutyl phthalate and 0.8-1.2 parts of glass beads.

2. The foam of claim 1, wherein the epoxy resin is 95 to 105 parts.

3. The foam of claim 2, wherein the glass microspheres are 0.9 to 1.1 parts.

4. The foam rubber according to claim 3, which comprises the following raw materials in parts by weight: 100 parts of epoxy resin, 23 parts of curing agent, 15 parts of dibutyl phthalate and 1 part of glass beads.

5. The foam of any of claims 1-4, wherein the epoxy resin is epoxy 618.

6. The foam of claim 5, wherein the curative is A50 curative.

7. The foam of claim 6, wherein the foam has a density of from 0.48 to 0.52 g/cc.

8. A process for the preparation of a foam according to any of claims 1 to 7, comprising the steps of:

(1) weighing epoxy resin and dibutyl phthalate according to a ratio, pouring the weighed dibutyl phthalate into the epoxy resin, and uniformly stirring to obtain a mixed solution I;

(2) weighing a curing agent according to a proportion, adding the weighed curing agent into the mixed solution I prepared in the step (1), and uniformly stirring to obtain a mixed solution II;

(3) and (3) weighing the glass beads according to the proportion, adding the weighed glass beads into the mixed solution II prepared in the step (2), and uniformly stirring to obtain the required foam adhesive.

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