CN115609965A

CN115609965A - Rigid foam processing technology

Info

Publication number: CN115609965A
Application number: CN202211183019.5A
Authority: CN
Inventors: 朱烨; 蔡正杰; 万辰; 钟海罡; 沈杰; 朱黎杰; 田洁; 魏莉丽
Original assignee: Nmg Composites Co ltd
Current assignee: Nmg Composites Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2023-01-17
Anticipated expiration: 2042-09-27
Also published as: CN115609965B

Abstract

The invention is suitable for the technical field of rigid foam processing, and provides a rigid foam processing technology, which comprises the following steps: respectively sticking grid cloth on the upper surface and the lower surface of the hard foam board; after the grid cloth is attached, a plurality of grooves are formed in the grid cloth on the upper surface of the hard foam board, and the depth of each groove is smaller than the thickness of the hard foam board; after the groove is formed, a reinforcing material is poured on the gridding cloth on the upper surface of the hard foam board, the surface layer reinforcing material and the reinforcing material in the groove form a whole, the hard foam processing technology provided by the invention adds a cloth sticking procedure, the gridding cloth is stuck on the upper surface and the lower surface of the board to form a sandwich structure similar to a sandwich structure, the upper surface gridding cloth is cut through the shallow groove and the deep groove, and then the reinforcing material is poured, and the actual shearing strength and peeling strength after pouring are obviously improved through the matching among the shallow groove, the deep groove and the additional gridding cloth which are formed on the surface.

Description

Rigid foam processing technology

Technical Field

The invention belongs to the technical field of rigid foam processing, and particularly relates to a rigid foam processing technology.

Background

The rigid foam is a foam which has no flexibility, has high compression hardness, can deform when stress reaches a certain value, and cannot recover the original shape after stress relief, and is usually applied to relevant aspects by utilizing the heat insulation property and the mechanical property of the foam. Representative products are polystyrene foams, rigid polyurethane foams, and also foams of phenolic, amino, epoxy, thermosetting acrylate resins, and the like, as well as rigid polyvinyl chloride foams. Can be used as heat insulating material, sandwich material, packaging material, sound insulating and shockproof material, building material, etc.;

at present, the performance requirements of customers are continuously improved, individual performance data (such as peel strength) of the rigid foam cannot meet the requirements, and the existing process structure and process processing mode are single, the optimization form is limited, and the competitiveness is insufficient.

Disclosure of Invention

The invention provides a rigid foam processing technology, and aims to solve the problems that the requirements of customers on the performance of rigid foam are continuously improved, individual performance data of the rigid foam cannot meet the requirements, and the existing technology has a single structure and a single processing mode.

The invention is realized in such a way that a rigid foam processing technology comprises the following steps:

respectively sticking grid cloth on the upper surface and the lower surface of the hard foam board;

after the grid cloth is attached, a plurality of grooves are formed in the grid cloth on the upper surface of the hard foam board;

after the grooving is finished, a reinforcing material is poured on the grid cloth on the upper surface of the hard foam board, and the surface layer reinforcing material and the reinforcing material in the groove form a whole.

Preferably, the groove comprises a groove A and a groove B, and the depth of the groove A is smaller than that of the groove B.

Preferably, a plurality of grooves A and grooves B which are arranged in parallel at intervals are formed in the length direction and the width direction of the hard foam board.

Preferably, the grooves a and the grooves B in the same direction are alternately arranged in sequence.

Preferably, the ends of the grooves a and B are open.

Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:

the hard foam processing technology provided by the invention is characterized in that a cloth sticking procedure is added, grid cloth is stuck on the upper surface and the lower surface of a plate to form a sandwich structure similar to a sandwich structure, the grid cloth on the upper surface is cut through the shallow grooves and the deep grooves, the continuity of the grid cloth on the upper surface is damaged, the grid cloth is only stuck on the hard foam on the upper surface, the stress of one integral surface of the original whole grid cloth is converted into the stress of a plurality of small square surfaces after the grid cloth is cut, the pulling force during stripping is dispersed, the stripping strength is increased, the grid cloth on the lower surface still plays a role in forming the deep grooves and preventing scattering after breaking the blocks, and then the reinforcing material is poured, after the pouring, because the grid cloth is cut during the grooving, the reinforcing material on the surface layer and the reinforcing material in the shallow grooves form an integral body, the counter force generated by extrusion resistance opposite to the acting force can be formed during the shearing or stripping test, the acting force during the shearing or stripping is increased, thereby the process performance after the material is improved, the requirements of the client performance are reached, the optimization of the product, and the processing technology is improved by the optimization of the processing technology and the processing technology.

Drawings

FIG. 1 is a schematic external structural view of example 1 of a rigid foam processing method according to the present invention;

FIG. 2 is a schematic view of the internal structure of example 1 of a rigid foam processing method according to the present invention;

FIG. 3 is a flow chart of example 1 of a rigid foam process provided by the present invention;

FIG. 4 is a conventional prior art layout;

FIG. 5 is a design drawing of additional mesh cloth and additional shallow grooves in an experimental scheme;

FIG. 6 is a design drawing of shallow slot + patch (integral mesh is not broken) in the experimental scheme;

FIG. 7 is a design of a shallow groove + patch (after patch, grooving cuts the mesh) in the experimental protocol;

FIG. 8 is a bar graph of the effect of web on peel strength for the experimental protocol;

FIG. 9 is a schematic structural diagram of example 2 of a rigid foam processing method according to the present invention.

Notations for reference numerals: 1. a rigid foam board; 2. mesh cloth; 3. a reinforcing material; 4. a groove A; 5. a groove B; 6. and a groove C.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different objects and not for describing a particular sequential order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Example 1

The embodiment of the invention provides a rigid foam processing technology, which comprises the following steps as shown in figures 1-3:

respectively sticking the upper surface and the lower surface of the hard foam plate 1 with the gridding cloth 2, and sticking the gridding cloth 2 by glue to form a sandwich structure similar to a sandwich structure;

after the grid cloth 2 is attached, a plurality of grooves are formed in the grid cloth 2 on the upper surface of the rigid foam board 1, and obviously, the depth of each groove is smaller than the thickness of the rigid foam board 1, specifically, each groove comprises a groove A4 and a groove B5, the depth of the groove A4 is smaller than the depth of the groove B5, the end portions of the grooves A4 and B5 are both open, the groove A4 is a shallow groove, the depth of the groove A4 can be one tenth to one sixth of the thickness of the rigid foam board 1, the groove B5 is a deep groove, the depth of the groove B5 can be seven eighths to nine tenths of the thickness of the rigid foam board 1, and certainly, the depth of each groove can be designed according to experiments, requirements and the like, and is not limited;

it can be understood that the mesh cloth 2 on the upper surface is cut by opening the shallow grooves and the deep grooves, and the continuity of the mesh cloth 2 on the upper surface is broken, so that the mesh cloth 2 is attached only to the rigid foam on the upper surface. However, the mesh cloth 2 on the lower surface of the rigid foam still plays a role in preventing scattering after deep grooves are formed and blocks are broken off;

after grooving is completed, pouring a reinforcing material 3 on the mesh cloth 2 on the upper surface of the rigid foam board 1, wherein the surface layer reinforcing material 3 and the reinforcing material 3 in the groove form a whole, and the reinforcing material 3 can be glass fiber reinforced plastics or other types of resins, etc., in this embodiment, the reinforcing material 3 is preferably glass fiber reinforced plastics, also called GFRP, that is, fiber reinforced plastics, generally, a matrix of glass fiber reinforced unsaturated polyester, epoxy resin and phenolic resin, and a reinforced plastic using glass fiber or products thereof as the reinforcing material 3, called glass fiber reinforced plastics, or called glass fiber reinforced plastics;

furthermore, after the glass fiber reinforced plastic is poured, as the grid cloth 2 is cut off during grooving, the surface glass fiber reinforced plastic and the glass fiber reinforced plastic in the shallow groove and the deep groove form a whole, and a reaction force generated by extrusion resistance opposite to the action force is formed in the shallow groove and the deep groove during a shearing or stripping test, so that the action force during shearing or stripping is increased;

when the stripping test is carried out, the surface layer grid cloth 2 is cut by the deep and shallow grooves without continuity, the stress of one whole surface of the original whole grid cloth 2 is converted into the stress of a plurality of small square surfaces after the grid cloth 2 is cut, the acting force pulled during stripping is dispersed, and the stripping strength is increased.

Wherein, follow the length direction and the width direction of rigid foam panel 1 all set up many interval parallel arrangement's groove A4 and groove B5, and the interval between the adjacent groove A4 of parallel can be 20mm, and the interval between the adjacent groove B5 of parallel can be 30mm.

In a specific implementation, the grooves A4 and the grooves B5 in the same direction may be alternately arranged in sequence.

The following are some experimental protocols for improving the course of the study:

scheme A: the effect of different hole spacing on peel strength was verified:

whether there is an influence on the peeling performance was tested by increasing the number of punched holes (changing the hole pitch). The experiment detects data of a total of three groups of different intervals, each group is tested for three times respectively, the average value is taken, the detection is respectively 10 × 10mm, 15 × 15mm and 20 × 20mm, and the deep groove face stripping data are compared as follows:

after the mesh cloth (i.e., the mesh cloth) is added, the mesh surface peeling data are compared as follows:

perforation interval	Number of perforations in peeled area	Peel strength, N.mm/mm
			20*20mm	64	56.42
15*15mm	100	58.41
			10*10mm	210	62.77

According to the comparison and analysis of the detection data, the pitch of the holes has certain influence on the peeling strength, but the pitch of the holes needs to be reduced to a certain extent to achieve the purpose if the peeling strength needs to be obviously improved, and the peeling strength can be improved by additionally attaching the mesh cloth;

scheme B: deep groove surface-mounted screen cloth

Mesh surface (with shallow grooves) (HPE 160), deep groove spacing of 30-30mm, shallow groove spacing of 20-20mm, hole spacing of 20-20mm;

experimental sample a: the process is net cloth cover (the net cloth is not broken);

experimental sample b: the process is a mesh surface (mesh breaking);

	peel strength, N.mm/mm
		Net cloth surface (Net cloth without breaking)	56.42
Net cloth surface (breaking net cloth)	66.68

Deep groove face (HPE 160): the conventional process comprises the steps of spacing between deep grooves of 30-30mm, spacing between shallow grooves of 20-20mm and spacing between holes of 20-20mm;

experimental sample c: the process is that the deep groove surface is not pasted with cloth;

experimental sample d: the process is that the deep groove surface is pasted with cloth (broken);

	peel strength, N.mm/mm
		Deep groove surface non-sticking cloth	31.15
Deep groove facing cloth (breaking)	50.46

Supplementary proof test

Effect of web on peeling: (HPE 110)

For the experimental sample, a web plate process (double-sided cross shallow grooves 20 x 20mm + punching 20 x 20 mm) is used, and one surface of the same plate is subjected to additional mesh;

	peel strength, N.mm/mm
		Deep groove surface non-sticking cloth	32.52
Deep groove facing cloth (breaking)	52.48

As shown in fig. 8, which is a bar graph of the effect of the mesh on the peel strength, it can be seen from fig. 8 that the increase of the peel strength of the deep grooved surface by the mesh and the breaking can effectively improve the peel strength, which is increased by 17.25n.mm/mm and by 55.38% compared with the conventional mesh without the deep grooved surface.

Principle analysis: increase and paste screen cloth

Fig. 4 shows a conventional design in the prior art (deep slot and punch are the same point, not referenced);

in the formula: m-peel strength (N/mm); pb — average peel load (N); p0-resistive load (N); d, the diameter (mm) of a roller boss; d-roller diameter (mm); b-sample width (mm);

in the case of identical samples, the only variable is Pb (average peel load), i.e. the average magnitude of the force at each position of the peel; the peel strength can be improved by increasing the force used for peeling at each site.

As shown in fig. 5, a design drawing of adding and pasting mesh cloth and adding and opening shallow grooves (deep grooves and holes are the same points, and are not referred to);

according to the graph, in the peeling test experiment, when the roller applies force according to the specified loading speed, the influence stress factors are as follows:

1. the force F3 of the opposition generated by the adhesion of the mesh and the shell during the peeling

2. Force F1 generated on both sides of shallow groove for resisting extrusion during stripping

3. Opposing force F2 generated by shallow trench bottom during stripping

When in use

While, P ↓ (P ≈ rr)

When in use

When the utility model is used, the water is discharged,

as shown in fig. 6, the design of shallow grooves and adhesive tapes (without breaking the entire fabric cloth) is shown, and in the actual test process, the addition of the fabric cloth on the surface of the shell is really helpful to increase the peeling strength; because the mesh cloth is stuck in a whole piece, in the test, due to the continuity of the whole piece of mesh cloth, the mesh cloth and the glass fiber reinforced plastics are peeled off together, and the glass fiber reinforced plastics on the surface and the glass fiber reinforced plastics in the shallow grooves are separated by the mesh cloth and cannot be well matched with the shallow grooves;

as shown in fig. 7, the design drawing of shallow groove + sticking cloth (after sticking cloth, grooving cuts the mesh cloth), after sticking the mesh cloth, opening the shallow groove of the shell, cutting the mesh cloth together, and after pouring, when performing a peeling test, the surface glass fiber reinforced plastic and the glass fiber reinforced plastic in the shallow groove form a whole, thereby increasing the resistance during peeling; and the screen cloth is broken without continuity, the stress of an integral surface is changed into the stress of a plurality of small square surfaces, and the pulling force during stripping is dispersed, so that the stripping strength is greatly increased.

Example 2

In this embodiment, on the basis of embodiment 1, as shown in fig. 9, before the step of pouring the reinforcing material 3, the method further includes: a plurality of parallel grooves C6 are formed in the side walls of the groove A4 and the groove B5 along the depth direction, the cross section of each groove C6 can be rectangular, semicircular, triangular and the like without limitation, the size can be designed according to requirements, and by designing the groove C6, after the reinforcing materials are poured, the surface layer reinforcing materials, the groove A4, the groove B5 and the groove C6 are integrated, so that the peeling strength can be further improved.

In summary, the invention provides a rigid foam processing technology, wherein the upper surface and the lower surface of a rigid foam board 1 are respectively attached with a grid cloth 2; after the grid cloth 2 is attached, a plurality of shallow grooves and deep grooves are formed in the grid cloth 2 on the upper surface of the rigid foam board 1; after grooving is completed, a reinforcing material 3 is poured on the grid cloth 2 on the upper surface of the rigid foam board 1, the surface layer reinforcing material 3 and the reinforcing material 3 in the groove form a whole, the shear strength and the peel strength are obviously improved after actual pouring through matching of the deep and shallow grooves formed in the surface and the additional pasting of the grid cloth 2, the requirements of customers on the performance are met through improving the technological performance of the poured material, the width and the breadth of the product are expanded through optimizing the technological structure of the rigid foam, and the processing capacities of different technological products are improved through optimizing the technological processing mode.

It should be noted that, for simplicity of description, the above-mentioned embodiments are described as a series of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or communication connection may be an indirect coupling or communication connection between devices or units through some interfaces, and may be in a telecommunication or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The above examples are only used to illustrate the technical solutions of the present invention, and do not limit the scope of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from these embodiments without making any inventive step, fall within the scope of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still make various combinations, additions, deletions or other modifications of the features of the embodiments of the present invention according to the situation without conflict, and thus, different technical solutions that do not substantially depart from the spirit of the present invention may be obtained, and these technical solutions also belong to the scope of the present invention.

Claims

1. The rigid foam processing technology is characterized by comprising the following steps:

after the grooving is finished, a reinforcing material is poured on the gridding cloth on the upper surface of the rigid foam board, and the surface layer reinforcing material and the reinforcing material in the groove form a whole.

2. The rigid foam process of claim 1, wherein the groove comprises a groove A and a groove B, the groove A having a depth less than the groove B.

3. The rigid foam processing process according to claim 2, wherein a plurality of grooves A and grooves B are formed in parallel at intervals along both the length direction and the width direction of the rigid foam board.

4. The process according to claim 3, wherein the grooves A and B in the same direction are alternately arranged in sequence.

5. The rigid foam process of claim 4, wherein the ends of both channel A and channel B are open.

6. The rigid foam process of claim 2, further comprising, prior to the step of infusing a reinforcing material:

a plurality of parallel grooves C are arranged on the side walls of the grooves A and the grooves B along the depth direction.

7. The rigid foam process of claim 1, wherein the reinforcing material is glass reinforced plastic.