CN111451115A - Preparation method of high-temperature-resistant embossed release paper for synthetic leather - Google Patents

Preparation method of high-temperature-resistant embossed release paper for synthetic leather Download PDF

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Publication number
CN111451115A
CN111451115A CN202010265050.8A CN202010265050A CN111451115A CN 111451115 A CN111451115 A CN 111451115A CN 202010265050 A CN202010265050 A CN 202010265050A CN 111451115 A CN111451115 A CN 111451115A
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China
Prior art keywords
coating
paper
accounts
release paper
release
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CN202010265050.8A
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Chinese (zh)
Inventor
张智慧
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Zhejiang Wangtai Special Paper Industry Co ltd
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Zhejiang Wangtai Special Paper Industry Co ltd
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Priority to CN202010265050.8A priority Critical patent/CN111451115A/en
Publication of CN111451115A publication Critical patent/CN111451115A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/04—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the partial melting of at least one layer
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/22—Paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2507/00—Polyolefins
    • B05D2507/01—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2507/00—Polyolefins
    • B05D2507/02—Polypropylene

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Paper (AREA)

Abstract

The invention relates to the field of release paper, in particular to a preparation method of high-temperature-resistant embossed release paper for synthetic leather, which comprises the following steps: pretreating base paper; blending and modifying PE and PP; laminating a coating layer film, and embossing the coated paper; protecting the back of the base paper and curing the finished paper; and finishing the preparation of the release paper. The invention blends and modifies according to a proper proportion, and solves the problems of poor bonding degree of single PP and base paper and single forming of single PE. The performance of the release paper is improved, so that the bonding force between the release agent layer and the base paper is tighter, the release layer is not easy to fall off, and the release paper has higher strength, heat resistance and solvent resistance.

Description

Preparation method of high-temperature-resistant embossed release paper for synthetic leather
Technical Field
The invention relates to the field of release paper, in particular to a preparation method of high-temperature-resistant embossed release paper for synthetic leather.
Background
The synthetic leather dry method technology in China starts in the 80 th 20 th century, and synthetic leather products with exquisite patterns, good texture and beautiful appearance are increasingly popular with consumers along with the development of society and abundant substance life. In recent years, the world center of the artificial leather and synthetic leather industry gradually shifts to China, and the demand of release paper (i.e. transfer paper) for synthetic leather also increases year by year. According to statistics, the annual demand of release paper in China is more than 2 ten thousand tons at present.
The release paper synthetic leather made from the release paper veneer has various designs and colors, can be used for producing common pattern leather, mirror surface leather, inner pattern leather, pearlescent leather, color printing wet process polyurethane synthetic leather and the like, greatly widens the product application, and provides rich and colorful synthetic leather products for the market. Therefore, the synthetic leather release paper becomes an important finishing material for producing PVC and PU synthetic leather. The synthetic leather produced by the release paper has the advantages of simple equipment, low investment, reusability, soft and elastic finished leather, diversified patterns and luster of the leather surface and the like.
At present, manufacturers for producing high-end release paper mainly concentrate on foreign countries, and the production of the pattern release paper for synthetic leather in China is still in a starting stage and most of the manufacturers are still in a scientific research and exploration stage; although some release papers are produced in small batches, the release layer is obtained by coating a smooth PE or PP film on release base paper, then coating a solvent type organic silicon and carrying out high-temperature curing treatment. The volatilization of the organic solvent in the product affects the quality of finished paper, and the stripping effect does not meet the requirement and does not meet the great trend of environmental protection.
Disclosure of Invention
The invention aims to provide a preparation method of release paper with simple process and cheap and easily-obtained raw materials, which solves the problem that the single PP is not well combined with the raw paper, and the prepared release paper meets the national standard in the performances such as stripping force, use frequency and the like, and can meet the requirements of most synthetic leather manufacturers.
Aiming at the technical problem, the invention provides a preparation method of high-temperature-resistant embossed release paper for synthetic leather, which comprises the following steps:
blowing dust on the coating surface of the front surface and the protection surface of the back surface of the base paper by a fan for later use;
blending, heating and melting PE, PP and a stripping agent according to a weight ratio to obtain a coating material;
coating the prepared coating material on a coating surface by a coating machine to obtain a first coating and a second coating in sequence, and embossing the coated coating surface by an embossing roller; fusing and compounding the PE film on the protective surface of the base paper while embossing;
in the first coating, PP accounts for 80-94%, PE accounts for 5-20%, and stripping agent accounts for 0-1%; in the second coating, PP accounts for 95-99%, PE accounts for 1-5%, and stripping agent accounts for 0-1%;
and curing and molding the embossed paper to finish the preparation of the release paper.
The release agent is polysiloxane.
The PE, the PP and the stripping agent in the coating material are proportioned by a proportioning device according to the weight ratio, uniformly stirred and heated to a melt, wherein the stirring time is 5-10min, and the heating temperature is 200-300 ℃.
The pressure of the embossing roller is 30-100kg/cm, and the running speed is 10-40 m/min.
The PE in the first coating and the second coating is L DPE, and the PE film is LL DPE film.
The coating material is sequentially filtered and exhausted and then coated on the coating surface by a coating machine through film spraying, and the temperature of the coating material is kept at 200-220 ℃ in the filtering and exhausting process.
The melt flow rate of the PP is 8-10g/min, and the melt flow rate of the PE is 2-9 g/min.
Compared with the prior art, the invention has the beneficial effects that:
1. polypropylene with melt flow rate within the range of 8-10g/10min and PE with melt flow rate within the range of 2-9g/10min are the best suitable coating materials for producing the PU leather embossed release paper, and are blended and modified in proper proportion, so that the problems of poor bonding degree of single PP and base paper and single forming of single PE are solved. The performance of the release paper is improved, so that the bonding force between the release agent layer and the base paper is tighter, the release layer is not easy to fall off, and the release paper has higher strength, heat resistance and solvent resistance.
2. By adopting a double-layer extrusion and film coating technology, the temperature of a coating material during coating is accurately controlled, the coating material is filtered and exhausted before coating, the uniformity of coating is ensured, and the product has good paper film bonding strength and good temperature resistance requirement, so that various different performance requirements of PU leather embossing release paper are met.
3. The PE film is fused and compounded on the protective surface of the back of the base paper, so that the release paper is smoother, the tolerance of LL DPE is good, and the release paper is easy to curl and package.
4. The first coating and the second coating are obtained by adopting double-layer film coating, the PE in the first coating increases the bonding strength between the film and the base paper, the PP in the second coating provides a carrier for embossing, and the stripping agent is added, so that the application times of the release paper finished product are increased.
Detailed Description
The present invention will be further illustrated by the following examples.
Example one
A preparation method of high temperature resistant embossed release paper for synthetic leather comprises the following steps:
uniformly stirring L DPE, PP and a stripping agent for 5min according to a weight ratio, and heating at 300 ℃ until a mixture is a melt to obtain a coating material I and a coating material II, wherein the PP accounts for 89 percent, L DPE accounts for 10 percent, polysiloxane accounts for 1 percent, the PP accounts for 95 percent, L DPE accounts for 4.5 percent, and polysiloxane accounts for 0.5 percent in the coating material II, the melt flow rate of the PP is 8g/min, and the melt flow rate of L DPE is 2 g/min.
The first coating material and the second coating material are subjected to heat preservation at 200 ℃, are sequentially filtered and exhausted, are coated on the coating surface of the base paper through a coating machine by means of film spraying to sequentially obtain a first coating layer and a second coating layer, the coated coating surface is embossed through an embossing roller, the pressure of the embossing roller is 30kg/cm, the running speed is 15m/min, and meanwhile an LL DPE film is fused and compounded on the protective surface of the base paper, and the embossed finished paper is cured and molded to complete the preparation of release paper.
Example two
A preparation method of high temperature resistant embossed release paper for synthetic leather comprises the following steps:
uniformly stirring L DPE, PP and a stripping agent for 8min according to a weight ratio, and heating at 250 ℃ until a mixture is a melt to obtain a coating material I and a coating material II, wherein the PP accounts for 80%, L DPE accounts for 20%, and polysiloxane accounts for 0%, the PP accounts for 98%, L DPE accounts for 1.1%, and the polysiloxane accounts for 0.9%, the melt flow rate of the PP is 9g/min, and the melt flow rate of L DPE is 6 g/min.
The first coating material and the second coating material are subjected to heat preservation at 210 ℃, are sequentially filtered and exhausted, are coated on the coating surface of the base paper through a coating machine by means of film spraying to sequentially obtain a first coating layer and a second coating layer, the coated coating surface is embossed through an embossing roller, the pressure of the embossing roller is 65kg/cm, the running speed is 25m/min, and meanwhile an LL DPE film is fused and compounded on the protective surface of the base paper, and the embossed finished paper is cured and molded to complete the preparation of release paper.
EXAMPLE III
A preparation method of high temperature resistant embossed release paper for synthetic leather comprises the following steps:
uniformly stirring L DPE, PP and a stripping agent for 10min according to a weight ratio, and heating at 200 ℃ until a mixture is a melt to obtain a coating material I and a coating material II, wherein the PP accounts for 94%, L DPE accounts for 5.5%, polysiloxane accounts for 0.5%, the PP accounts for 95%, L DPE accounts for 4.7%, and polysiloxane accounts for 0.3%, the melt flow rate of the PP is 10g/min, and the melt flow rate of L DPE is 9 g/min.
The first coating material and the second coating material are subjected to heat preservation at 220 ℃, are sequentially filtered and exhausted, are coated on the coating surface of the base paper through a coating machine by means of film spraying to sequentially obtain a first coating layer and a second coating layer, the coated coating surface is embossed through an embossing roller, the pressure of the embossing roller is 100kg/cm, the running speed is 40m/min, and meanwhile an LL DPE film is fused and compounded on the protective surface of the base paper, and the embossed finished paper is cured and molded to complete the preparation of release paper.
The following table shows the test results and the corresponding national standards of the release paper prepared in each example, and it can be seen from the following table that the release paper prepared by the preparation method has various properties which are in accordance with the national standards, and some properties are more excellent, and has higher strength, heat resistance and solvent resistance. Can basically meet the requirements of high-end synthetic leather processing.
Figure BDA0002440956510000051
Figure BDA0002440956510000061
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (7)

1. A preparation method of high temperature resistant embossed release paper for synthetic leather is characterized by comprising the following steps:
blowing dust on the coating surface of the front surface and the protection surface of the back surface of the base paper by a fan for later use;
blending, heating and melting PE, PP and a stripping agent according to a weight ratio to obtain a coating material;
coating the prepared coating material on a coating surface by a coating machine to obtain a first coating and a second coating in sequence, and embossing the coated coating surface by an embossing roller; fusing and compounding the PE film on the protective surface of the base paper while embossing;
in the first coating, PP accounts for 80-94%, PE accounts for 5-20%, and stripping agent accounts for 0-1%; in the second coating, PP accounts for 95-99%, PE accounts for 1-5%, and stripping agent accounts for 0-1%;
and curing and molding the embossed base paper to finish the preparation of the release paper.
2. The method of claim 1, wherein: the release agent is polysiloxane.
3. The method of claim 1, wherein: the PE, the PP and the stripping agent in the coating material are proportioned by a proportioning device according to the weight ratio, uniformly stirred and heated to a melt, wherein the stirring time is 5-10min, and the heating temperature is 200-300 ℃.
4. The method of claim 1, wherein: the pressure of the embossing roller is 30-100kg/cm, and the running speed is 10-40 m/min.
5. The method of claim 1, wherein the PE in the first and second layers is L DPE and the PE film is LL DPE.
6. The method of claim 1, wherein: the coating material is sequentially filtered and exhausted and then coated on the coating surface by a coating machine through film spraying, and the temperature of the coating material is kept at 200-220 ℃ in the filtering and exhausting process.
7. The production method according to claim 3, characterized in that: the melt flow rate of the PP is 8-10g/min, and the melt flow rate of the PE is 2-9 g/min.
CN202010265050.8A 2020-04-07 2020-04-07 Preparation method of high-temperature-resistant embossed release paper for synthetic leather Pending CN111451115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010265050.8A CN111451115A (en) 2020-04-07 2020-04-07 Preparation method of high-temperature-resistant embossed release paper for synthetic leather

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010265050.8A CN111451115A (en) 2020-04-07 2020-04-07 Preparation method of high-temperature-resistant embossed release paper for synthetic leather

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060228480A1 (en) * 2005-03-30 2006-10-12 David Lin Method of manufacturing a release liner
CN109853295A (en) * 2018-12-27 2019-06-07 浙江博力莫新材料科技有限公司 A kind of release paper of Anti-curling and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060228480A1 (en) * 2005-03-30 2006-10-12 David Lin Method of manufacturing a release liner
CN109853295A (en) * 2018-12-27 2019-06-07 浙江博力莫新材料科技有限公司 A kind of release paper of Anti-curling and preparation method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
周明华: "PU革压纹离型纸的研制", 《中国优秀博硕士学位论文全文数据库（硕士） 工程科技Ⅰ辑》 *
安郁琴等: "《制浆造纸助剂》", 31 August 2012 *

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