CN108659381A - A kind of PVC foams plate and preparation method thereof - Google Patents

A kind of PVC foams plate and preparation method thereof Download PDF

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Publication number
CN108659381A
CN108659381A CN201810374818.8A CN201810374818A CN108659381A CN 108659381 A CN108659381 A CN 108659381A CN 201810374818 A CN201810374818 A CN 201810374818A CN 108659381 A CN108659381 A CN 108659381A
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Prior art keywords
parts
pvc
temperature
foaming
raw material
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CN201810374818.8A
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Chinese (zh)
Inventor
徐乐
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Guilin Quanzhou Liaoyuan Science & Technology Co Ltd
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Guilin Quanzhou Liaoyuan Science & Technology Co Ltd
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Priority to CN201810374818.8A priority Critical patent/CN108659381A/en
Publication of CN108659381A publication Critical patent/CN108659381A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0014—Use of organic additives
    • C08J9/0023—Use of organic additives containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0085—Use of fibrous compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/34—Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2497/00—Characterised by the use of lignin-containing materials
    • C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Medicine (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The present invention relates to technical field of plastic, and in particular to a kind of PVC foams plate and preparation method thereof.It includes PVC, coupling agent, stearic acid, wood powder, compound stabilizer, foaming control agent, fatty alcohol dicarboxylic acids fat, AC foaming agents, precipitated calcium carbonate, PE waxes, lead sulfate tribasic to prepare raw material.The present invention provides the formula of a science, wood powder used is cheap, source is extensively sent out, and is easy to prepare, is reduced manufacturing cost, and the PVC wood plastic building mould manufactured has good toughness, not easy to break, using nano-calcium carbonate as filler, fineness, grain size are smaller, the smooth exquisiteness of PVC wood plastic building mould manufactured, better performances.And the present invention, by the stringent control to process conditions such as extrusion temperature head pressure screw speeds in preparation process, for the PVC crust foaming plate materials produced by test, performance meets 95 quality requirements of Q/STNY001.And preparation method is simple, and it is easy to operate, it can widely popularize.

Description

A kind of PVC foams plate and preparation method thereof
Technical field
The present invention relates to technical field of plastic, and in particular to a kind of PVC foams plate and preparation method thereof.
Background technology
PVC foam plate is also known as PVC expansion sheet and An Di plates, is divided into two kinds of foam and free foaming.PVC foam plate is used Way is very extensive, because its price is superior with respect to low performance, is increasingly subject to public welcome, can be divided by manufacture craft PVC foam plate PVC co-extrusion foaming boards, PVC foams plate and PVC Free Foaming Panels, wherein PVC foams plate surface hardness are total less than PVC Extrusion foaming board, raw cut of having difficult labour, is widely used in cabinet, decoration etc..But the formula of current PVC foam plates not science, system Make complex process, limits yield and the development of industry.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of PVC foams plate and preparation method thereof, particular technique sides Case is as follows：
A kind of PVC foams plate prepares each component that raw material includes following parts by weight：45-55 parts of PVC, coupling agent 0.15- 0.2 part, 0.15-0.2 parts of stearic acid, 5-15 parts of wood powder, 1.5-2.5 parts of compound stabilizer, 5-15 parts of foaming control agent, fatty alcohol 0.2-1 parts of dicarboxylic acids fat, 0.5-2 parts of AC foaming agents, 5-15 parts of precipitated calcium carbonate, 0.1-0.5 parts of PE waxes, lead sulfate tribasic 0.05-0.2 parts.
Further, each component that raw material includes following parts by weight is prepared：100 parts of PVC, 0.18 part of coupling agent, stearic acid 0.18 part, 9 parts of wood powder, 1.8 parts of compound stabilizer, 9 parts of foaming control agent, 0.4 part of fatty alcohol dicarboxylic acids fat, 1 part of AC foaming agents, 7 parts of precipitated calcium carbonate, 0.25 part of PE waxes, 0.1 part of lead sulfate tribasic.
Further, the raw material of the wood powder includes one or more below：Sawdust, sawdust, bamboo scraps, straw, wheat tangerine, paddy Chaff, peanut shell, bagasse, cocoanut shell, flax.
Further, the preparation method of the wood powder is：The raw material of wood powder is put into disinfection 10-20 minutes under ultraviolet light, so It is 300-400 mesh to be ground to fineness again afterwards.
Further, foaming control agent is the mixture of ACR530 and ACR401, mixed proportion 2-3:6-7.
A kind of preparation method of PVC foams plate includes the following steps：
（1）The each component in raw material is weighed according to the parts by weight；
（2）Raw material after weighing is added in high-speed mixer, is heated to 110-120 DEG C and keeps the temperature 5-10 minutes, by mixed material It is put into cold mixer and is cooled to 35-40 DEG C, be then transferred into feed bin, expanded material is extruded into conical double-screw, squeeze out The temperature in one area of machine is：150-160 DEG C, the temperature in 2nd area of extruder is：160-170 DEG C, the temperature in 3rd area of extruder is：165- 175 DEG C, the temperature in 4th area of extruder is：175-185 DEG C, the temperature of transition body is 165-175 DEG C, and the temperature of mouth mold is：170- 180 DEG C, the temperature of lip mould is：170-180 DEG C, extruded velocity is：0.65-1 ms/min, host feeding rotating speed is 70-80 revs/min Clock, Vacuum shaping, cooling and shaping, trimming finishing are carried out after extruded foaming materials again, and producing foamed plank finally presses required length It is cut and is packed.
Further, the skinning thickness control of the PVC foams plate is：0.1-1 millimeters.
Beneficial effects of the present invention are：
The present invention provides the formula of a science, and wood powder used is cheap, and source is extensively sent out, and is easy to prepare, reduces manufacture Cost, and the PVC wood plastic building mould manufactured has good toughness, it is not easy to break, it is used as and is filled out using nano-calcium carbonate Material, fineness, grain size are smaller, the smooth exquisiteness of PVC wood plastic building mould manufactured, better performances.And the present invention passes through to system The stringent control of the process conditions such as the extrusion temperature head pressure screw speed during standby, the PVC foams produced Plank has the following performance by test:Averag density is (0.45 ~ 0.55) x103kg/m3, plate stretch intensity >=8N/mm2, Impact strength >=8.5kJ/m2, surface shore hardness >=A60.Performance meets Q/STNY001-95 quality requirements.And preparation method Simply, easy to operate, it can widely popularize.
Specific implementation mode
In order to better understand the present invention, the present invention is further explained in the light of specific embodiments：
Embodiment 1：
A kind of PVC foams plate prepares each component that raw material includes following parts by weight：45 parts of PVC, 0.15 part of coupling agent, 0.15 part of stearic acid, 6 parts of wood powder, 1.5 parts of compound stabilizer, 12 parts of foaming control agent, 0.8 part of fatty alcohol dicarboxylic acids fat, AC hairs 1.7 parts of infusion, 12 parts of precipitated calcium carbonate, 0.4 part of PE waxes, 0.1 part of lead sulfate tribasic.
The raw material of wood powder includes 5 kinds below：Sawdust, peanut shell, bagasse, cocoanut shell, flax.The preparation method of wood powder For：The raw material of wood powder is put and is sterilized 10 minutes under ultraviolet light, it is 300-40 mesh to be then ground to fineness again.Foaming control agent is The mixture of ACR530 and ACR401, mixed proportion 2:6.
A kind of preparation method of PVC foams plate includes the following steps：
（1）The each component in raw material is weighed according to the parts by weight；
（2）Raw material after weighing is added in high-speed mixer, is heated to 110 DEG C and keeps the temperature 5 minutes, mixed material is put into cold mixed It is cooled to 35 DEG C in machine, is then transferred into feed bin, expanded material, the temperature in one area of extruder are extruded into conical double-screw For：150 DEG C, the temperature in 2nd area of extruder is：160 DEG C, the temperature in 3rd area of extruder is：165 DEG C, the temperature in 4th area of extruder For：175 DEG C, the temperature of transition body is 165 DEG C, and the temperature of mouth mold is：170 DEG C, the temperature of lip mould is：170 DEG C, extruded velocity For：0.65 m/min, host feeding rotating speed is 70 revs/min, carries out Vacuum shaping after extruded foaming materials again, is cooled and shaped, cuts Side is modified, and producing foamed plank is finally cut and packed by required length.The skinning thickness control of PVC foam plates For：0.2 millimeter.
Embodiment 2：
A kind of PVC foams plate prepares each component that raw material includes following parts by weight：100 parts of PVC, 0.18 part of coupling agent, 0.18 part of stearic acid, 9 parts of wood powder, 1.8 parts of compound stabilizer, 9 parts of foaming control agent, 0.4 part of fatty alcohol dicarboxylic acids fat, AC foaming 1 part of agent, 7 parts of precipitated calcium carbonate, 0.25 part of PE waxes, 0.1 part of lead sulfate tribasic.
The raw material of wood powder includes 5 kinds below：Sawdust, bamboo scraps, straw, wheat tangerine, cavings.The preparation method of wood powder is：It will The raw material of wood powder is put to be sterilized 20 minutes under ultraviolet light, and it is 400 mesh to be then ground to fineness again.Foaming control agent be ACR530 and The mixture of ACR401, mixed proportion 3:6.
A kind of preparation method of PVC foams plate includes the following steps：
（1）The each component in raw material is weighed according to the parts by weight；
（2）Raw material after weighing is added in high-speed mixer, is heated to 120 DEG C and keeps the temperature 10 minutes, mixed material is put into cold 40 DEG C are cooled in mixed machine, is then transferred into feed bin, expanded material, the temperature in one area of extruder is extruded into conical double-screw Degree is：155 DEG C, the temperature in 2nd area of extruder is：165 DEG C, the temperature in 3rd area of extruder is：170 DEG C, the temperature in 4th area of extruder For：180 DEG C, the temperature of transition body is 170 DEG C, and the temperature of mouth mold is：175 DEG C, the temperature of lip mould is：175 DEG C, extruded velocity For：0.8 m/min, host feeding rotating speed is 80 revs/min, carries out Vacuum shaping after extruded foaming materials again, is cooled and shaped, cuts Side is modified, and producing foamed plank is finally cut and packed by required length.The skinning thickness control of PVC foam plates For：0.5 millimeter.
The present invention is not limited to above-described specific implementation mode, and the foregoing is merely the preferable case study on implementation of the present invention , be not intended to limit the invention, all within the spirits and principles of the present invention made by any modification, equivalent replacement and change Into etc., it should all be included in the protection scope of the present invention.

Claims (7)

1. a kind of PVC foams plate, it is characterised in that：Prepare each component that raw material includes following parts by weight：PVC 45-55 Part, 0.15-0.2 parts of coupling agent, 0.15-0.2 parts of stearic acid, 5-15 parts of wood powder, 1.5-2.5 parts of compound stabilizer, foaming are adjusted 5-15 parts of agent, 0.2-1 parts of fatty alcohol dicarboxylic acids fat, 0.5-2 parts of AC foaming agents, 5-15 parts of precipitated calcium carbonate, PE waxes 0.1-0.5 Part, 0.05-0.2 parts of lead sulfate tribasic.
2. a kind of PVC foams plate according to claim 1, it is characterised in that：It includes following parts by weight to prepare raw material Each component：100 parts of PVC, 0.18 part of coupling agent, 0.18 part of stearic acid, 9 parts of wood powder, 1.8 parts of compound stabilizer, foaming are adjusted 9 parts of agent, 0.4 part of fatty alcohol dicarboxylic acids fat, 1 part of AC foaming agents, 7 parts of precipitated calcium carbonate, 0.25 part of PE waxes, lead sulfate tribasic 0.1 part.
3. a kind of PVC foams plate according to claim 1 or 2, it is characterised in that：The raw material of the wood powder include with Under one or more：Sawdust, sawdust, bamboo scraps, straw, wheat tangerine, cavings, peanut shell, bagasse, cocoanut shell, flax.
4. a kind of PVC foams plate according to claim 3, it is characterised in that：The preparation method of the wood powder is：It will The raw material of wood powder is put to be sterilized 10-20 minutes under ultraviolet light, and it is 300-400 mesh to be then ground to fineness again.
5. a kind of PVC foams plate according to claim 1, it is characterised in that：Foaming control agent be ACR530 and The mixture of ACR401, mixed proportion 2-3:6-7.
6. a kind of preparation method of PVC foams plate according to any one of claims 1 to 5, it is characterised in that：Including following Step：
（1）The each component in raw material is weighed according to the parts by weight；
（2）Raw material after weighing is added in high-speed mixer, is heated to 110-120 DEG C and keeps the temperature 5-10 minutes, by mixed material It is put into cold mixer and is cooled to 35-40 DEG C, be then transferred into feed bin, expanded material is extruded into conical double-screw, squeeze out The temperature in one area of machine is：150-160 DEG C, the temperature in 2nd area of extruder is：160-170 DEG C, the temperature in 3rd area of extruder is：165- 175 DEG C, the temperature in 4th area of extruder is：175-185 DEG C, the temperature of transition body is 165-175 DEG C, and the temperature of mouth mold is：170- 180 DEG C, the temperature of lip mould is：170-180 DEG C, extruded velocity is：0.65-1 ms/min, host feeding rotating speed is 70-80 revs/min Clock, Vacuum shaping, cooling and shaping, trimming finishing are carried out after extruded foaming materials again, and producing foamed plank finally presses required length It is cut and is packed.
7. a kind of preparation method of PVC foams plate according to claim 6, it is characterised in that：The PVC skinning hair Bubble plate skinning thickness control be：0.1-1 millimeters.
CN201810374818.8A 2018-04-24 2018-04-24 A kind of PVC foams plate and preparation method thereof Withdrawn CN108659381A (en)

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Application Number Priority Date Filing Date Title
CN201810374818.8A CN108659381A (en) 2018-04-24 2018-04-24 A kind of PVC foams plate and preparation method thereof

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Application Number Priority Date Filing Date Title
CN201810374818.8A CN108659381A (en) 2018-04-24 2018-04-24 A kind of PVC foams plate and preparation method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109320879A (en) * 2018-10-25 2019-02-12 浙江坤鸿新材料有限公司 A kind of PVC nano decorative material and its disintegrating apparatus
CN115340733A (en) * 2022-08-19 2022-11-15 格瑞禾正(山东)节能建材有限公司 Environment-friendly heat-insulation building material and preparation method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109320879A (en) * 2018-10-25 2019-02-12 浙江坤鸿新材料有限公司 A kind of PVC nano decorative material and its disintegrating apparatus
CN115340733A (en) * 2022-08-19 2022-11-15 格瑞禾正(山东)节能建材有限公司 Environment-friendly heat-insulation building material and preparation method and application thereof

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Application publication date: 20181016