CN110815960A - Accelerant-containing expanded felt material and preparation method thereof - Google Patents
Accelerant-containing expanded felt material and preparation method thereof Download PDFInfo
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- CN110815960A CN110815960A CN201911052305.6A CN201911052305A CN110815960A CN 110815960 A CN110815960 A CN 110815960A CN 201911052305 A CN201911052305 A CN 201911052305A CN 110815960 A CN110815960 A CN 110815960A
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- accelerant
- alkali
- accelerator
- free glass
- mass fraction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M17/00—Producing multi-layer textile fabrics
- D06M17/04—Producing multi-layer textile fabrics by applying synthetic resins as adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention provides an accelerant-containing intumescent felt material which comprises 65-75 mass percent of alkali-free glass filaments, 20-30 mass percent of epoxy resin, 2-7 mass percent of zinc neodecanoate accelerant and 1-4 mass percent of polyester non-woven fabric. By adopting zinc neodecanoate as an accelerant, the expanded felt material has stable performance, and is safe and environment-friendly.
Description
Technical Field
The invention relates to an intumescent felt material containing an accelerant, belonging to the technical field of electrical insulating materials.
Background
The expansion felt containing the accelerant is a glass felt formed by rolling disordered and anisotropic alkali-free glass random filaments, is preimpregnated with epoxy anhydride resin and the accelerant, and is prepared by a hot pressing process. The composite material is in a plate shape under normal conditions, has certain rigidity, but has a relatively loose structure, and is easy to peel between layers. The fixing device is mainly used for fixing coils at the winding end of the rotating motor between a cushion block and a filler strip in a wedge in a slot and the coils. When the expanded felt is matched with epoxy-anhydride resin for use, the expanded felt is soaked with the resin, and the expanded felt material is cured under the action of the accelerator, so that the expanded felt material can completely fill air gaps in the motor and fix parts such as coils and the like, thereby solving the problem of vibration in a groove and at the end part when the motor runs for a long time.
The accelerator used in the existing accelerator-containing intumescent felt material is zinc naphthenate, and the zinc naphthenate is a mixture of organic zinc salts with five-membered rings or six-membered rings in the molecular structure. The accelerant is mainly derived from petrochemical products, and the composition, average molecular weight, viscosity and zinc content of the accelerant have large fluctuation, so that the performance of the expanded felt material is unstable. In addition, intumescent felt materials containing zinc naphthenate accelerators have an irritating odor, pollute the environment and pose potential health risks to humans. Therefore, there is a need to develop an accelerator-containing expanded felt material that is safer, more environmentally friendly, and more stable in performance.
Disclosure of Invention
The invention aims to solve the technical problems that the prior intumescent felt material containing the zinc naphthenate accelerant has pungent smell, pollutes the environment and has health risks to human bodies.
In order to solve the problems, the technical scheme adopted by the invention is to provide an intumescent mat material containing an accelerant, which is characterized by comprising alkali-free glass fibers, epoxy resin, the accelerant and non-woven fabrics; the mass fraction of the alkali-free glass filaments is 65-75%; the mass fraction of the epoxy resin is 20-30%; the accelerant is artificially synthesized zinc neodecanoate, and the mass fraction is 2-7%; the mass fraction of the non-woven fabric is 1-4%.
Preferably, the mass fraction of the alkali-free glass filaments is 66.6%.
Preferably, the epoxy resin is bisphenol A epoxy resin with the mass fraction of 26.8%.
Preferably, the accelerant is artificially synthesized zinc neodecanoate, and the mass fraction is 4.1%.
Preferably, the non-woven fabric is a polyester non-woven fabric, and the mass fraction of the non-woven fabric is 2.5%.
The invention provides a preparation method of an intumescent felt material containing an accelerant, which is characterized by comprising the following steps:
step 1: and adding the accelerant into the epoxy adhesive, and stirring and mixing uniformly to obtain a mixed glue solution for later use.
Step 2: and dipping the alkali-free glass fiber into the mixed glue solution for gum dipping. Controlling the gum dipping time to be 30-60s to fully soak the alkali-free glass fibers.
And step 3: and carrying out glue squeezing treatment on the alkali-free glass filaments after gum dipping to remove redundant adhesive.
And 4, step 4: and respectively attaching the two layers of non-woven fabrics to the two sides of the alkali-free glass fiber after the glue squeezing for hot pressing treatment to obtain the non-woven fabric-alkali-free glass fiber-non-woven fabric three-layer composite expanded felt material.
And 5: and cutting the expanded felt material to obtain the required size. And after the hot-pressed expanded felt material is naturally cooled to room temperature, cutting according to the requirement.
Preferably, the accelerator is added to the epoxy adhesive in step 1, and the stirring and mixing are performed by mixing the accelerator and the epoxy adhesive according to a mass ratio, and stirring is performed to uniformly disperse the accelerator into the epoxy adhesive.
Preferably, the accelerator and the epoxy adhesive in the step 1 can be mixed according to the mass ratio of 1: 7.
Preferentially, the two layers of non-woven fabrics are respectively attached to the two sides of the alkali-free glass fiber after the glue extrusion to carry out the hot pressing treatment, the hot pressing temperature is 100-125 ℃, and the duration is 1-3 hours, so that the thickness of the expanded felt material after the hot pressing is 1-3 mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an accelerant-containing expanded felt material which is safe, environment-friendly and stable in performance.
Detailed Description
In order that the invention may be more readily understood, preferred embodiments are described in detail below;
the embodiment provides an intumescent felt material containing an accelerant, which comprises alkali-free glass filaments, epoxy resin, the accelerant and non-woven fabrics; the mass fraction of the alkali-free glass filaments is 66.6 percent; the epoxy resin is bisphenol A type epoxy resin, and the mass fraction is 26.8%; the accelerant is artificially synthesized zinc neodecanoate with the mass fraction of 4.1%; the non-woven fabric is a polyester non-woven fabric, and the mass fraction of the non-woven fabric is 2.5%. The expansion capacity of the expansion felt material is more than or equal to 450 percent; the expansion capacity is the ratio of the volume after 2 hours of free expansion to the original volume at a test temperature of 65 ℃. The alkali-free glass fiber is long glass fiber, and the length of the fiber can be between 20 and 50 mm. The long glass fiber is adopted, and the rebound capability of the long glass fiber is better, so that the expansion capability is favorably improved. The glass transition temperature of the expanded felt material after being impregnated and cured by the epoxy-anhydride resin is more than or equal to 130 ℃, and the higher the glass transition temperature is, the better the heat resistance is. The epoxy-anhydride resin is a mixed impregnating resin formed by matching high-purity low-molecular-weight bisphenol A epoxy resin and anhydride according to the proportion of 1:1, the anhydride can be methyl hexahydrophthalic anhydride or methyl tetrahydrophthalic anhydride, and the impregnating resin can be subjected to curing reaction under the action of an accelerator.
The invention provides a preparation method of an expansion felt material containing an accelerant, which comprises the following steps:
step 1: and adding the accelerant into the epoxy adhesive, and stirring and mixing uniformly to obtain a mixed glue solution for later use. Specifically, the accelerator and the epoxy adhesive can be mixed according to the mass ratio of 1:7, and the mixture is stirred to uniformly disperse the accelerator into the epoxy adhesive.
Step 2: and dipping the alkali-free glass fiber into the mixed glue solution for gum dipping. Specifically, the gum dipping time is controlled to be 30-60s, so that the alkali-free glass fiber is fully soaked.
And step 3: and carrying out glue squeezing treatment on the alkali-free glass filaments after glue dipping. Specifically, a flat plate molding press may be used to perform the extrusion process to remove excess adhesive.
And 4, step 4: and respectively attaching the two layers of non-woven fabrics to the two sides of the alkali-free glass fiber after the glue squeezing for hot pressing treatment to obtain the non-woven fabric-alkali-free glass fiber-non-woven fabric three-layer composite expanded felt material. Optionally, the hot pressing temperature is 125 ℃ and the hot pressing lasts for 2.5 hours, so that the thickness of the expanded felt material after hot pressing is 1-3 mm.
And 5: and cutting the expanded felt material to obtain the required size. Specifically, after the expanded felt material subjected to hot pressing is naturally cooled to room temperature, cutting is performed according to requirements.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (9)
1. An intumescent mat material containing an accelerant is characterized by comprising alkali-free glass filaments, epoxy resin, the accelerant and non-woven fabrics; the mass fraction of the alkali-free glass filaments is 65-75%; the mass fraction of the epoxy resin is 20-30%; the accelerant is artificially synthesized zinc neodecanoate, and the mass fraction is 2-7%; the mass fraction of the non-woven fabric is 1-4%.
2. An intumescent mat material containing an accelerator as claimed in claim 1, wherein said alkali-free glass filaments have a mass fraction of 66.6%.
3. The intumescent mat material containing an accelerator of claim 1, wherein said epoxy resin is a bisphenol a type epoxy resin with a mass fraction of 26.8%.
4. The intumescent mat material containing accelerator of claim 1, wherein said accelerator is artificially synthesized zinc neodecanoate with a mass fraction of 4.1%.
5. The intumescent mat material containing an accelerator as claimed in claim 1, wherein said nonwoven fabric is a polyester nonwoven fabric with a mass fraction of 2.5%.
6. A process for preparing an accelerator-containing expanded felt material as claimed in claim 1, comprising the steps of:
step 1: and adding the accelerant into the epoxy adhesive, and stirring and mixing uniformly to obtain a mixed glue solution for later use.
Step 2: and dipping the alkali-free glass fiber into the mixed glue solution for gum dipping. Controlling the gum dipping time to be 30-60s to fully soak the alkali-free glass fibers.
And step 3: and carrying out glue squeezing treatment on the alkali-free glass filaments after gum dipping to remove redundant adhesive.
And 4, step 4: and respectively attaching the two layers of non-woven fabrics to the two sides of the alkali-free glass fiber after the glue squeezing for hot pressing treatment to obtain the non-woven fabric-alkali-free glass fiber-non-woven fabric three-layer composite expanded felt material.
And 5: and cutting the expanded felt material to obtain the required size. And after the hot-pressed expanded felt material is naturally cooled to room temperature, cutting according to the requirement.
7. The process for preparing an accelerator-containing expanded felt material according to claim 6, wherein: the accelerant is added into the epoxy adhesive in the step 1, and the stirring and mixing are to mix the accelerant and the epoxy adhesive according to the mass ratio, and the accelerant is uniformly dispersed into the epoxy adhesive by stirring.
8. The process for preparing an accelerator-containing intumescent mat material of claim 7, wherein: the accelerator and the epoxy adhesive in the step 1 can be mixed according to the mass ratio of 1: 7.
9. The process for preparing an accelerator-containing expanded felt material according to claim 6, wherein: and 4, respectively attaching the two layers of non-woven fabrics to the two sides of the alkali-free glass fiber after the glue extrusion for hot pressing treatment, wherein the hot pressing temperature is 100-125 ℃, and the hot pressing lasts for 1-3 hours, so that the thickness of the expanded felt material after the hot pressing is 1-3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911052305.6A CN110815960B (en) | 2019-10-31 | 2019-10-31 | Accelerant-containing expanded felt material and preparation method thereof |
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| CN201911052305.6A CN110815960B (en) | 2019-10-31 | 2019-10-31 | Accelerant-containing expanded felt material and preparation method thereof |
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| CN110815960A true CN110815960A (en) | 2020-02-21 |
| CN110815960B CN110815960B (en) | 2022-07-26 |
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| CN110815960B (en) | 2022-07-26 |
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