CN1204007C - Free-cutting soft plastic pencil holder formulation - Google Patents
Free-cutting soft plastic pencil holder formulation Download PDFInfo
- Publication number
- CN1204007C CN1204007C CN 02136188 CN02136188A CN1204007C CN 1204007 C CN1204007 C CN 1204007C CN 02136188 CN02136188 CN 02136188 CN 02136188 A CN02136188 A CN 02136188A CN 1204007 C CN1204007 C CN 1204007C
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- CN
- China
- Prior art keywords
- soft plastic
- plastic pencil
- free
- shafts
- formulation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Compositions Of Macromolecular Compounds (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The present invention provides a formulation of a soft plastic pencil shaft, which comprises components of the following proportion by weight: 45% to 60% of polyvinyl chloride, 38% to 50% of calcium carbonate, 1.0% to 2.2% of dibutyl ester, 0.80% to 2.2% of dioctyl ester, and 0.20% to 0.30% of foaming agent. The foaming agent in the plastic pencil shaft is azo compound. Soft plastic pencil shafts made by using the present invention have fabulously good flexibility, the soft plastic pencil shafts can not be broken even when bent, the soft plastic pencil shafts are easy to sharpen by rolling, and the shape of the soft plastic pencil shafts is variable. The foaming agent is added, which greatly increases the production efficiency of the soft plastic pencil shafts and also promotes the stability of the product quality.
Description
Technical field
The present invention relates to a kind of pencil, especially relate to a kind of improvement existing flexible plastic penholder prescription.
Background technology
General pencil adopts wooden, is mounted in the wooden penholder by the strip lead for retractable pencil to constitute.During making, must be through a lot of cutting action, round log is made the penholder of circular, regular hexagon or octagon etc., this process is quite loaded down with trivial details, and cost of manufacture is very high, and has wasted a large amount of high-quality timber, is unfavorable for current environmental requirement.In order to overcome the above-mentioned shortcoming of Wood pencil, soft plastic pencil has also been arranged now, such as, someone has applied for the patent of " a kind of manufacture method of plastic pencil " (94110665.9) by name, its objective is the waste that solves timber, realization is to mould generation wood production polymer pencil, comprise in its prescription that polyethylene 10～60, polypropylene 10～60, polyvinyl chloride 10～60, potter's clay 5～50, talcum powder 10～50, land plaster 15～50, look female are an amount of, each composition is mixed put into injection mo(u)lding and be plastic pencil.But existing plastic pencil prescription is also not quite reasonable, because the processing technology aspect, the penholder of producing often toughness is relatively poor, and is difficult for cutting.
Summary of the invention
The present invention mainly is that solution existing in prior technology plastic pencil penholder toughness is relatively poor, the technical problem of difficult cutting etc.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: the prescription of free-cutting soft plastic penholder, and its component and content are:
Polyvinyl chloride 40-70%
Calcium carbonate 29-55%
Dibutyl ester 0.45-2.5%
Dioctyl ester 0.40-2.5%
Blowing agent 0.15-0.35%
As preferably, the prescription of described free-cutting soft plastic penholder, its component and content are:
Polyvinyl chloride 45-60%
Calcium carbonate 38-50%
Dibutyl ester 1.0-2.2%
Dioctyl ester 0.8-2.2%
Blowing agent 0.20-0.30%
As preferably, described blowing agent is an azo-compound.
Therefore, it is suitable that the present invention has selection, prescription rationally, the pencil holder of producing has certain toughness and is easy to characteristics such as cutting.In addition, owing to added blowing agent, the production efficiency of soft plastic pencil also improves a lot, and also is beneficial to the stable of product quality.
The specific embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment: the method that the present invention makes the free-cutting soft plastic penholder is to put into the penholder machine after raw material is mixed by proportioning, under 130-140 ℃ condition, heat, the lead for retractable pencil that utilizes the lead for retractable pencil machine to extrude by prior art enters penholder machine punching fusion moulding, that penholder can be done is circular, regular hexagon or octagon etc., after put into cold water and be cooled to normal temperature, the finished product that the penholder machine is come out gets final product by the design length cut-out, when needing, can rubber tip be installed at pen arm end.
Referring to following table 1, dispose each component respectively by listed 5 kinds of proportionings in the table, under identical fabrication process condition, be made into pencil holder, compare its pliability and free-cutting machinability, the result is as follows:
Table 1: the content of each composition (WT%) in the free-cutting soft plastic penholder
| Polyvinyl chloride | Calcium carbonate | Dibutyl ester | Dioctyl ester | Blowing agent | Implementation result | |
| Embodiment 1 | 48 | 48 | 2 | 1.75 | 0.25 | Good |
| Embodiment 2 | 60 | 38 | 1 | 0.8 | 0.2 | Better |
| Embodiment 3 | 70 | 29 | 0.45 | 0.4 | 0.15 | Generally |
| Embodiment 4 | 45 | 50 | 2.5 | 2.2 | 0.3 | Better |
| Embodiment 5 | 40 | 55 | 2.2 | 2.45 | 0.35 | Generally |
Claims (1)
1. the prescription of a free-cutting soft plastic pencil holder, the weight ratio of its component and content is:
Polyvinyl chloride 40-70%
Calcium carbonate 29-55%
Dibutyl ester 0.45-2.5%
Dioctyl ester 0.40-2.5%
Blowing agent 0.15-0.35%
Blowing agent wherein is an azo-compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02136188 CN1204007C (en) | 2002-07-22 | 2002-07-22 | Free-cutting soft plastic pencil holder formulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02136188 CN1204007C (en) | 2002-07-22 | 2002-07-22 | Free-cutting soft plastic pencil holder formulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1470399A CN1470399A (en) | 2004-01-28 |
| CN1204007C true CN1204007C (en) | 2005-06-01 |
Family
ID=34146346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02136188 Expired - Fee Related CN1204007C (en) | 2002-07-22 | 2002-07-22 | Free-cutting soft plastic pencil holder formulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1204007C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105131631A (en) * | 2015-09-17 | 2015-12-09 | 蚌埠市神龙笔业有限公司 | Environment-friendly magnetic pencil body |
| CN108997677A (en) * | 2018-08-23 | 2018-12-14 | 苏州马培德办公用品制造有限公司 | A kind of easily roll up cuts environment-friendly type plastic pencil bar material and preparation method thereof |
-
2002
- 2002-07-22 CN CN 02136188 patent/CN1204007C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1470399A (en) | 2004-01-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050601 |